52639 + Interview Questions in Secondary School in Chemistry

1.	Non aqueous solution example isa. Tincture of iodine b. Alcohol in waterc. CCl4 in water d. All
Answer» ANSWER: a. TINCTURE of iodine. Explanation: because a non-aqueous SOLUTION is one which has a solvent other than water and tincture of iodine has alcohol and iodine as solvent and solute.

1.

Non aqueous solution example isa. Tincture of iodine b. Alcohol in waterc. CCl4 in water d. All

Answer»

a. TINCTURE of iodine.

Explanation:

because a non-aqueous SOLUTION is one which has a solvent other than water and tincture of iodine has alcohol and iodine as solvent and solute.

Discussion

2.	Socl2 undergoes partial hydrolysis
Answer» EXPLANATION: SOCL2 +H2O---> 2HCL +SO

2.

Socl2 undergoes partial hydrolysis

Answer»

EXPLANATION:

SOCL2 +H2O---> 2HCL +SO

Discussion

3.	What is the full form of PAN ?
Answer» ANSWER: PERMANENT ACCOUNT number Explanation:

3.

What is the full form of PAN ?

Answer»

ANSWER:

PERMANENT ACCOUNT number

Explanation:

Discussion

4.	Show the schematically how the following separation can be carried out:(1) Common salt + water+ sawdust
Answer» ANSWER: PLEASE GIVE me the answer this question Explanation:

4.

Show the schematically how the following separation can be carried out:(1) Common salt + water+ sawdust

Answer»

ANSWER:

PLEASE GIVE me the answer this question

Explanation:

Discussion

5.	In 10volume solution of hydrogenperoxide the strength of solution is
Answer» 10 volume solution of H2O2 means that 1L of this H2O2 solution will give 10L of oxygen at STP. Hence, strength of H2O2 in 10 volume H2O2 solution = 30 g / L = 3% H2O2 solution.

Discussion

6.	Which of the following can exist as a single atom
Answer» Answer: 2.8. ELEMENTS can be made of ONE atom, like He, or be elemental molecules, such as HYDROGEN (H2), oxygen (O2), chlorine (Cl2), ozone (O3), and SULFUR (S8). Explanation:

6.

Which of the following can exist as a single atom

Answer»

Answer:

2.8. ELEMENTS can be made of ONE atom, like He, or be elemental molecules, such as HYDROGEN (H2), oxygen (O2), chlorine (Cl2), ozone (O3), and SULFUR (S8).

Explanation:

Discussion

7.	What is nacl ? Give balanced equation. please
Answer» EXPLANATION: SODIUM CHLORIDE =nacl 2 NA + CL2 = 2NaCl

7.

What is nacl ? Give balanced equation. please

Answer»

EXPLANATION:

SODIUM CHLORIDE =nacl

2 NA + CL2 = 2NaCl

Discussion

8.	Give reasons (iv) Water at room temperature is a liquid.
Answer» Answer: At room TEMPERATURE (25°C), water is a LIQUID because it has the following characteristics of liquid: At room temperature, water has no shape but has a fixed volume i.e., it occupies the shape of the CONTAINER in which it is kept. At room temperature, water flows easily. mark me as brainliest and PLEASE follow me and to my YOUTUBE channel abiraj 718

8.

Give reasons (iv) Water at room temperature is a liquid.

Answer»

Answer:

At room TEMPERATURE (25°C), water is a LIQUID because it has the following characteristics of liquid: At room temperature, water has no shape but has a fixed volume i.e., it occupies the shape of the CONTAINER in which it is kept. At room temperature, water flows easily.

mark me as brainliest and PLEASE follow me and to my YOUTUBE channel abiraj 718

Discussion

9.	FeSO, + KMnO,+H,SO, Fe2(SO),MnSO,+K SO,+H2O by oxidation number method
Answer» The oxidation number METHOD is a way of keeping TRACK of electrons when BALANCING redox equations. The general idea is that electrons are transferred between charged atoms. Here's how the oxidation number method works for a very simple equation that you could probably balance in your head. . . TRY to solve it by yourself.. . . I hope it's helpful for you.. . . *♪＼(＾▽＾)／＼(＾▽＾)／*

9.

FeSO, + KMnO,+H,SO, Fe2(SO),MnSO,+K SO,+H2O by oxidation number method

Answer»

The oxidation number METHOD is a way of keeping TRACK of electrons when BALANCING redox equations. The general idea is that electrons are transferred between charged atoms. Here's how the oxidation number method works for a very simple equation that you could probably balance in your head.

.

TRY to solve it by yourself..

.

I hope it's helpful for you..

.

♪＼(*＾▽＾*)／＼(*＾▽＾*)／

Discussion

10.	Glass rodLiquid decanted inthe funnel fitted witha filter paperFunnelFilter paperO(a)Test tube(b)(c)Filter paperCone of(folded) a filter paperFiltrateFig. 2.2: Filtration
Answer» ANSWER: DONT know Explanation:

10.

Glass rodLiquid decanted inthe funnel fitted witha filter paperFunnelFilter paperO(a)Test tube(b)(c)Filter paperCone of(folded) a filter paperFiltrateFig. 2.2: Filtration

Answer»

ANSWER:

DONT know

Explanation:

Discussion

11.	What is the full form of ROM ?
Answer» ANSWER: The full of ROM is Read Only Memory. Explanation: HOPE it helps you.

11.

What is the full form of ROM ?

Answer»

ANSWER:

The full of ROM is Read Only Memory.

Explanation:

HOPE it helps you.

Discussion

12.	12 A solution is amixture of two or more substances
Answer» Answer: In chemistry, a SOLUTION is a special type of homogeneous MIXTURE composed of two or more substances. In such a mixture, a solute is a substance dissolved in ANOTHER substance, KNOWN as a solvent. hope you understood it

12.

12 A solution is amixture of two or more substances

Answer»

Answer:

In chemistry, a SOLUTION is a special type of homogeneous MIXTURE composed of two or more substances. In such a mixture, a solute is a substance dissolved in ANOTHER substance, KNOWN as a solvent.

hope you understood it

Discussion

13.	How many significant figures are present in the following?(i) 200(ii) 2004(iii) 0.200(iv) 0.00456(v) 1.0008 × 106(vi) 2.3206 × 10−5(vii) 23.483(viii) 23.123123(ix) 3.0(x) 12.60
Answer» ANSWER: I was PRESENT in TODAY's CLASS. ...............

13.

How many significant figures are present in the following?(i) 200(ii) 2004(iii) 0.200(iv) 0.00456(v) 1.0008 × 106(vi) 2.3206 × 10−5(vii) 23.483(viii) 23.123123(ix) 3.0(x) 12.60

Answer»

ANSWER:

I was PRESENT in TODAY's CLASS.

...............

Discussion

14.	Sodium have 1 valance atom... So it has a tendency to lose 1 electron and obtain neon like configuration... Therefore, it's ELECTRON AFFINITY should be negative becoz it has tendency to lose electron..... Then why it's elctron affinity is postitive??? Plzz explain
Answer» Explanation: Most ATOMS do not have eight electrons in their valence electron shell. Some atoms have only a few electrons in their outer shell, while some atoms lack only one or two electrons to have an octet. In cases where an atom has three or fewer valence electrons, the atom may lose those valence electrons quite easily until what remains is a lower shell that contains an octet. Atoms that lose electrons acquire a positive charge as a result because they are left with fewer negatively charged electrons to balance the positive CHARGES of the protons in the nucleus. Positively charged ions are called cations. Most metals become cations when they MAKE IONIC compounds

14.

Sodium have 1 valance atom... So it has a tendency to lose 1 electron and obtain neon like configuration... Therefore, it's ELECTRON AFFINITY should be negative becoz it has tendency to lose electron..... Then why it's elctron affinity is postitive??? Plzz explain

Answer»

Explanation:

Most ATOMS do not have eight electrons in their valence electron shell. Some atoms have only a few electrons in their outer shell, while some atoms lack only one or two electrons to have an octet. In cases where an atom has three or fewer valence electrons, the atom may lose those valence electrons quite easily until what remains is a lower shell that contains an octet. Atoms that lose electrons acquire a positive charge as a result because they are left with fewer negatively charged electrons to balance the positive CHARGES of the protons in the nucleus. Positively charged ions are called cations. Most metals become cations when they MAKE IONIC compounds

Discussion

15.	What is the full form of RAM ?
Answer» ANSWER: The full form of RAM is RANDOM Access Memory. Explanation: HOPE it helps you.

15.

What is the full form of RAM ?

Answer»

ANSWER:

The full form of RAM is RANDOM Access Memory.

Explanation:

HOPE it helps you.

Discussion

16.	Laughing gas santific name?
Answer» ANSWER:DINITROGEN monoxide Explanation:

16.

Laughing gas santific name?

Answer»

ANSWER:DINITROGEN monoxide

Explanation:

Discussion

17.	What mass of sodium hydroxide is dissolved in 500ml of solution so that the strength of solution may be 10 g /l
Answer» ANSWER: $\begin{lgathered}\small{ \implies \frac{sin \theta - cos\theta}{ sin \theta + cos\theta} } \\ \\ \implies - \frac{ \frac{sin \theta - cos\theta}{sin \theta} }{ \frac{sin \theta + cos\theta}{sin \theta}} \\ \\ \implies \frac{ \frac{sin \theta}{sin \theta} - \frac{cos\theta}{sin \theta} }{ \frac{sin \theta}{sin\theta} + \frac{cos\theta}{sin \theta} } \\ \\ \implies \small{ \frac{1 - cot\theta}{1 + cot \theta}}\end{lgathered}$

17.

What mass of sodium hydroxide is dissolved in 500ml of solution so that the strength of solution may be 10 g /l

Answer»

ANSWER:

$\begin{lgathered}\small{ \implies \frac{sin \theta - cos\theta}{ sin \theta + cos\theta} } \\ \\ \implies - \frac{ \frac{sin \theta - cos\theta}{sin \theta} }{ \frac{sin \theta + cos\theta}{sin \theta}} \\ \\ \implies \frac{ \frac{sin \theta}{sin \theta} - \frac{cos\theta}{sin \theta} }{ \frac{sin \theta}{sin\theta} + \frac{cos\theta}{sin \theta} } \\ \\ \implies \small{ \frac{1 - cot\theta}{1 + cot \theta}}\end{lgathered}$

Discussion

18.	What is the full form of B.P.L ?
Answer» Below POVERTY LINE.. $°°°°°°body {padding-left: 30%;padding-top: 5%;}.container {width: 200px;height: 200px;position: relative;-webkit-perspective: 1000px;-moz-perspective: 1000px;}#cube {width: 100%;height: 100%;position: absolute;-webkit-transform-style: preserve-3d;-webkit-animation: rotatecube 10s infinite;-moz-transform-style: preserve-3d;-moz-animation: rotatecube 10s infinite;}#cube div {width: 200px;height: 200px;display: block;position: absolute;border: none;line-height: 200px;text-align: center;font-size: 50px;font-weight: bold;}@-webkit-keyframes rotatecube {0% { -webkit-transform: rotateX(0deg) rotateY(360deg) rotateZ(90deg); }25% { -webkit-transform: rotateX(90deg) rotateY(270deg) rotateZ(180deg); }50% { -webkit-transform: rotateX(180deg) rotateY(180deg) rotateZ(0deg); }75% { -webkit-transform: rotateX(270deg) rotateY(90deg) rotateZ(360deg); }100% { -webkit-transform: rotateX(360deg) rotateY(0deg) rotateZ(270deg); }}@-moz-keyframes rotatecube {0% { -moz-transform: rotateX(0deg) rotateY(360deg) rotateZ(90deg); }25% { -moz-transform: rotateX(90deg) rotateY(270deg) rotateZ(180deg); }50% { -moz-transform: rotateX(180deg) rotateY(180deg) rotateZ(0deg); }75% { -moz-transform: rotateX(270deg) rotateY(90deg) rotateZ(360deg); }100% { -moz-transform: rotateX(360deg) rotateY(0deg) rotateZ(270deg); }}.front {background: rgba(255,0,0,.5);}.back {background: rgba(0,255,0,.5);}.right {background: rgba(0,0,255,.5);}.left {background: rgba(0,255,255,.5);}.top {background: rgba(255,0,255,.5);}.bottom {background: rgba(255,255,0,.5);}#cube .front {-webkit-transform: rotateY(0deg ) translateZ( 100px );-moz-transform: rotateY( 0deg ) translateZ( 100px );}#cube .back {-webkit-transform: rotateX( 180deg ) translateZ( 100px );-moz-transform: rotateX( 180deg ) translateZ( 100px );}#cube .right {-webkit-transform: rotateY( 90deg ) translateZ( 100px );-moz-transform: rotateY( 90deg ) translateZ( 100px );}#cube .left {-webkit-transform: rotateY( -90deg ) translateZ( 100px );-moz-transform: rotateY( -90deg ) translateZ( 100px );}#cube .top {-webkit-transform: rotateX( 90deg ) translateZ( 100px );-moz-transform: rotateX( 90deg ) translateZ( 100px );}#cube .bottom {-webkit-transform: rotateX( -90deg ) translateZ( 100px );-moz-transform: rotateX( -90deg ) translateZ( 100px );}$

18.

What is the full form of B.P.L ?

Answer»

Below POVERTY LINE..

$°°°°°°body {padding-left: 30%;padding-top: 5%;}.container {width: 200px;height: 200px;position: relative;-webkit-perspective: 1000px;-moz-perspective: 1000px;}#cube {width: 100%;height: 100%;position: absolute;-webkit-transform-style: preserve-3d;-webkit-animation: rotatecube 10s infinite;-moz-transform-style: preserve-3d;-moz-animation: rotatecube 10s infinite;}#cube div {width: 200px;height: 200px;display: block;position: absolute;border: none;line-height: 200px;text-align: center;font-size: 50px;font-weight: bold;}@-webkit-keyframes rotatecube {0% { -webkit-transform: rotateX(0deg) rotateY(360deg) rotateZ(90deg); }25% { -webkit-transform: rotateX(90deg) rotateY(270deg) rotateZ(180deg); }50% { -webkit-transform: rotateX(180deg) rotateY(180deg) rotateZ(0deg); }75% { -webkit-transform: rotateX(270deg) rotateY(90deg) rotateZ(360deg); }100% { -webkit-transform: rotateX(360deg) rotateY(0deg) rotateZ(270deg); }}@-moz-keyframes rotatecube {0% { -moz-transform: rotateX(0deg) rotateY(360deg) rotateZ(90deg); }25% { -moz-transform: rotateX(90deg) rotateY(270deg) rotateZ(180deg); }50% { -moz-transform: rotateX(180deg) rotateY(180deg) rotateZ(0deg); }75% { -moz-transform: rotateX(270deg) rotateY(90deg) rotateZ(360deg); }100% { -moz-transform: rotateX(360deg) rotateY(0deg) rotateZ(270deg); }}.front {background: rgba(255,0,0,.5);}.back {background: rgba(0,255,0,.5);}.right {background: rgba(0,0,255,.5);}.left {background: rgba(0,255,255,.5);}.top {background: rgba(255,0,255,.5);}.bottom {background: rgba(255,255,0,.5);}#cube .front {-webkit-transform: rotateY(0deg ) translateZ( 100px );-moz-transform: rotateY( 0deg ) translateZ( 100px );}#cube .back {-webkit-transform: rotateX( 180deg ) translateZ( 100px );-moz-transform: rotateX( 180deg ) translateZ( 100px );}#cube .right {-webkit-transform: rotateY( 90deg ) translateZ( 100px );-moz-transform: rotateY( 90deg ) translateZ( 100px );}#cube .left {-webkit-transform: rotateY( -90deg ) translateZ( 100px );-moz-transform: rotateY( -90deg ) translateZ( 100px );}#cube .top {-webkit-transform: rotateX( 90deg ) translateZ( 100px );-moz-transform: rotateX( 90deg ) translateZ( 100px );}#cube .bottom {-webkit-transform: rotateX( -90deg ) translateZ( 100px );-moz-transform: rotateX( -90deg ) translateZ( 100px );}$

Discussion

19.	No flame is observed when coal is burnt. Why?
Answer» Answer: Coal does not produce flame when BURNT because it does not vapourizes, only those substances which vapourizes on burning produce flame LIKE wax , natural gas. Explanation: MARK AS BRAINLIEST

19.

No flame is observed when coal is burnt. Why?

Answer»

Answer:

Coal does not produce flame when BURNT because it does not vapourizes, only those substances which vapourizes on burning produce flame LIKE wax , natural gas.

Explanation:

MARK AS BRAINLIEST

Discussion

20.	Class 9Lesson 2 in chemistry exercises
Answer» ANSWER: PLEASE send the PHOTO in exercises I have no idea which SIZE you to say that Explanation: PRINCE please send the photo in exercises I can solve it exercise I can give the answer in exercise

20.

Class 9Lesson 2 in chemistry exercises

Answer»

ANSWER:

PLEASE send the PHOTO in exercises I have no idea which SIZE you to say that

Explanation:

PRINCE please send the photo in exercises I can solve it exercise I can give the answer in exercise

Discussion

21.	Gas evolved when calcium reacts with water is/are?
Answer» ANSWER: HYDROGEN GAS and a CLOUDY WHITE precipitate Explanation:

21.

Gas evolved when calcium reacts with water is/are?

Answer»

ANSWER:

HYDROGEN GAS and a CLOUDY WHITE precipitate

Explanation:

Discussion

22.	What other chlorides gives a neutral solution when added to water
Answer» ANSWER: sodium CHLORIDE NACL i think it is COMMON salt

22.

What other chlorides gives a neutral solution when added to water

Answer»

ANSWER:

sodium CHLORIDE NACL i think it is COMMON salt

Discussion

23.	Which of the following is expressed to have the smallest radius?(a) p^3- (b) S^2-(c)Cl- (d) Ca^2+
Answer» Answer: (b) S^2- Explanation: *Sulphur* *because* in *modern* *periodic* *table* it is *most* *electro-negativity* *elements, if electron* in *OUTERMOST* *ORBIT* is *more* *than* *no.of* *proton* *while* *increase, then* *the* *size* of *the* *atom* *BECAME* *smaller. Therefore, sulfur(S^2-) have* *SMALLEST* *radius* *from* *above* *mention* *following*.

23.

Which of the following is expressed to have the smallest radius?(a) p^3- (b) S^2-(c)Cl- (d) Ca^2+

Answer»

Answer:

(b) S^2-

Explanation:

Sulphur because in modern periodic table it is most electro-negativity elements, if electron in OUTERMOST ORBIT is more than no.of proton while increase, then the size of the atom BECAME smaller. Therefore, sulfur(S^2-) have SMALLEST radius from above mention following.

Discussion

24.	Define chemistry !!
Answer» the BRANCH of science concerned with the SUBSTANCES of which MATTER is composed, the INVESTIGATION of their properties and reactions, and the use of such reactions to form new substances.

Discussion

25.	A solution of NaOH contains 30 grams of the compound in 1.5 dm3 of solution. What is it molarity ?
Answer» ANSWER: don't KNOW the answer but MARK as BRAINLIST and FOLLOW me ☺☺

25.

A solution of NaOH contains 30 grams of the compound in 1.5 dm3 of solution. What is it molarity ?

Answer»

ANSWER:

don't KNOW the answer but MARK as BRAINLIST and FOLLOW me ☺☺

Discussion

26.	Structural the structural form of sodium chloride
Answer» It is an ionic COMPOUND CONSISTING of a sodium cation (NA+) and a chloride anion (CL-). SOLID NaCl has a crystalline structure, in which each Na+ ion is surrounded by six chloride ions in an octahedral geometry.

Discussion

27.	Have you ever seen a game of tug-of war? In this game two teams pull at a rope in opposite directions . Members of both the teams try to pull the rope in their direction. Sometimes the ropesimply does not move. The team that pulls harder, that is, applies a larger force, finally wins the game. What do these examples suggest about the nature of force? Forces applied on an object in the same direction add to one another. Now recall what happened when you and your friend pushed the heavy box in the same direction . If the two forces act in the opposite directions on an object, the net force acting on it is the difference between the two forces. What did you observe , when both of you were pushing the heavy box from opposite directions? Recall that in the tug-of-war when two teams pull equally hard, the rope does not move in any direction. So, we learn that a force could be larger or smaller than the other or equal to each other. The strength of a force is usually expressed by its magnitude. We have also to specify the direction in which a force acts. Also, if the direction or the magnitude of the applied force changes, its effect also changes.Answer the following question:-a)What is the strength of the two forces F1 & F2 , if they are applied along the same direction ? Where F1 is twice the F2.
Answer» Answer: the rope, two pulls act in opposite DIRECTIONS. ... forces (pulls) and the rope moves in the direction of the larger force ( PULL). ... How SATISFIED are you with the answer? Top answer In a game of tug-of-war, teams apply forces in terms of pulls on the rope. On the rope, two pulls act in opposite directions. The net force becomes ... More

27.

Have you ever seen a game of tug-of war? In this game two teams pull at a rope in opposite directions . Members of both the teams try to pull the rope in their direction. Sometimes the ropesimply does not move. The team that pulls harder, that is, applies a larger force, finally wins the game. What do these examples suggest about the nature of force? Forces applied on an object in the same direction add to one another. Now recall what happened when you and your friend pushed the heavy box in the same direction . If the two forces act in the opposite directions on an object, the net force acting on it is the difference between the two forces. What did you observe , when both of you were pushing the heavy box from opposite directions? Recall that in the tug-of-war when two teams pull equally hard, the rope does not move in any direction. So, we learn that a force could be larger or smaller than the other or equal to each other. The strength of a force is usually expressed by its magnitude. We have also to specify the direction in which a force acts. Also, if the direction or the magnitude of the applied force changes, its effect also changes.Answer the following question:-a)What is the strength of the two forces F1 & F2 , if they are applied along the same direction ? Where F1 is twice the F2.

Answer»

Answer:

the rope, two pulls act in opposite DIRECTIONS. ... forces (pulls) and the rope moves in the direction of the larger force ( PULL). ... How SATISFIED are you with the answer?

28.	Write a short note on various sources of water
Answer» Answer: There are TWO main sources of water: SURFACE water and groundwater. Surface Water is found in lakes, rivers, and reservoirs. Groundwater LIES under the surface of the land, where it travels through and fills openings in the rocks. The rocks that STORE and transmit groundwater are CALLED aquifers.

Write a short note on various sources of water

Answer»

Answer:

There are TWO main sources of water: SURFACE water and groundwater. Surface Water is found in lakes, rivers, and reservoirs. Groundwater LIES under the surface of the land, where it travels through and fills openings in the rocks. The rocks that STORE and transmit groundwater are CALLED aquifers.

Discussion

29.	Please solve this as fast as possible
Answer» ANSWER: 3 is the CORRECT answer

29.

Please solve this as fast as possible

Answer»

ANSWER:

3 is the CORRECT answer

Discussion

30.	How many significant figures are present in the following?(i) 200
Answer» ANSWER: There are TWO SIGNIFICANT FIGURES

30.

How many significant figures are present in the following?(i) 200

Answer»

ANSWER:

There are TWO SIGNIFICANT FIGURES

Discussion

31.	What is difference between alkane alkyl radical?
Answer» Answer: An alkane is a saturated HYDROCARBON, which means there are only carbon-carbon single bonds. The -ANE part of the naming is what indicates that the hydrocarbon has only single bonds. Alkyls are the SUBSTITUENTS in alkanes. When naming the substituent, the ending -ane is changed to -yl. An ALKENE is an unsaturated hydrocarbon, which means it has ONE or more carbon-carbon double bonds. Another type of unsaturated hydrocarbon, is the alkyne, which has on or more carbon-carbon triple bonds In summary, an alkane has only single bonds, an alkene has double bonds, an alkyne has triple bonds, and an alkyne is a substituent. Explanation:

31.

What is difference between alkane alkyl radical?

Answer»

Answer:

An alkane is a saturated HYDROCARBON, which means there are only carbon-carbon single bonds. The -ANE part of the naming is what indicates that the hydrocarbon has only single bonds.

Alkyls are the SUBSTITUENTS in alkanes. When naming the substituent, the ending -ane is changed to -yl.

An ALKENE is an unsaturated hydrocarbon, which means it has ONE or more carbon-carbon double bonds.

Another type of unsaturated hydrocarbon, is the alkyne, which has on or more carbon-carbon triple bonds

In summary, an alkane has only single bonds, an alkene has double bonds, an alkyne has triple bonds, and an alkyne is a substituent.

Explanation:

Discussion

32.	22. The density of a gas is 1.964 g / dm-3 at 273 K and 76 cm Hg. The gasis1) CH42) CO₂3) Xe4) C₂H6
Answer» C02 Explanation: pV=nRT or pv= (w/M)RT or M= (w/v)(RT/p) Therefore, M=d (RT/p) Here, d=1.964g/dm^3 =1.964×10^−3 g/cc P = 76 CM = 760 mm Hg = 1 atm R = 0.0821 L atm K^−1 MOL ^−1 =82.1 cc atmK ^−1 mol ^−1 T=273K ∴M= (1.964×10^−3 ×82.1×273)/1 = 44g/mol The molecular weight of CO2is 44. So, the gas is CO2 .

32.

22. The density of a gas is 1.964 g / dm-3 at 273 K and 76 cm Hg. The gasis1) CH42) CO₂3) Xe4) C₂H6

Answer»

C02

Explanation:

pV=nRT or pv= (w/M)RT or M= (w/v)(RT/p)

Therefore, M=d (RT/p)

Here, d=1.964g/dm^3 =1.964×10^−3 g/cc

P = 76 CM = 760 mm Hg = 1 atm

R = 0.0821 L atm K^−1 MOL ^−1

=82.1 cc atmK ^−1 mol ^−1

T=273K

∴M= (1.964×10^−3 ×82.1×273)/1 = 44g/mol

The molecular weight of CO2is 44.

So, the gas is CO2

.

Discussion

33.	Acid,base or salt are the hood conductor of electricity or not
Answer» ANSWER: no Explanation: because the do not CONTAIN METAL

33.

Acid,base or salt are the hood conductor of electricity or not

Answer»

ANSWER:

no

Explanation:

because the do not CONTAIN METAL

Discussion

34.	Have you ever seen a game of tug-of war? In this game two teams pull at a rope in opposite directions . Members of both the teams try to pull the rope in their direction. Sometimes the ropesimply does not move. The team that pulls harder, that is, applies a larger force, finally wins the game. What do these examples suggest about the nature of force? Forces applied on an object in the same direction add to one another. Now recall what happened when you and your friend pushed the heavy box in the same direction . If the two forces act in the opposite directions on an object, the net force acting on it is the difference between the two forces. What did you observe , when both of you were pushing the heavy box from opposite directions? Recall that in the tug-of-war when two teams pull equally hard, the rope does not move in any direction. So, we learn that a force could be larger or smaller than the other or equal to each other. The strength of a force is usually expressed by its magnitude. We have also to specify the direction in which a force acts. Also, if the direction or the magnitude of the applied force changes, its effect also changes.Answer the following questions a) What is the net force if the game given below is drew?b) The team that pulls harder, that is, applies a larger force, finally wins the game. Justify.c) What is the strength of the two forces F1 & F2 , if they are applied along the same direction ? Where F1 is twice the F2.
Answer» ANSWER: Net force=0 the motion is toward the SIDE with non ZERO force after CANCELLING each other if they are APPLIED in sam side f= F1+F2 if 3f1

34.

Have you ever seen a game of tug-of war? In this game two teams pull at a rope in opposite directions . Members of both the teams try to pull the rope in their direction. Sometimes the ropesimply does not move. The team that pulls harder, that is, applies a larger force, finally wins the game. What do these examples suggest about the nature of force? Forces applied on an object in the same direction add to one another. Now recall what happened when you and your friend pushed the heavy box in the same direction . If the two forces act in the opposite directions on an object, the net force acting on it is the difference between the two forces. What did you observe , when both of you were pushing the heavy box from opposite directions? Recall that in the tug-of-war when two teams pull equally hard, the rope does not move in any direction. So, we learn that a force could be larger or smaller than the other or equal to each other. The strength of a force is usually expressed by its magnitude. We have also to specify the direction in which a force acts. Also, if the direction or the magnitude of the applied force changes, its effect also changes.Answer the following questions a) What is the net force if the game given below is drew?b) The team that pulls harder, that is, applies a larger force, finally wins the game. Justify.c) What is the strength of the two forces F1 & F2 , if they are applied along the same direction ? Where F1 is twice the F2.

Answer»

ANSWER:

Net force=0

the motion is toward the SIDE with non ZERO force after CANCELLING each other

if they are APPLIED in sam side f= F1+F2

if 3f1

Discussion

35.	1.5g aspirin is weighed out into an R.B flask. Then 40 mL 10% NaOH is added and refluxed for 15 min. Transfer the solution quantitatively into a 250 mL standard flask, made upto the mark. From that 20 mL is pipette, acidified with 2 mL con. HCl. Then add 50 mL of brominating mixture, shake well for 15min. Then 10 mL 10% KI is added & diluted with H2O and titrated against standard Na2S2O3 using starch as indicator.
Answer» ANSWER: soory friend this question are SEARCH on GOOGLE

35.

1.5g aspirin is weighed out into an R.B flask. Then 40 mL 10% NaOH is added and refluxed for 15 min. Transfer the solution quantitatively into a 250 mL standard flask, made upto the mark. From that 20 mL is pipette, acidified with 2 mL con. HCl. Then add 50 mL of brominating mixture, shake well for 15min. Then 10 mL 10% KI is added & diluted with H2O and titrated against standard Na2S2O3 using starch as indicator.

Answer»

ANSWER:

soory friend this question are SEARCH on GOOGLE

Discussion

36.	What will happen if we pour iodine solution on pulses
Answer» ANSWER: No reaction occurs, because IODINE only REACTS with food that contain starch but PULSES contain resistant starch which kind of REVERSES the effect.

36.

What will happen if we pour iodine solution on pulses

Answer»

ANSWER:

No reaction occurs, because IODINE only REACTS with food that contain starch but PULSES contain resistant starch which kind of REVERSES the effect.

Discussion

37.	Convert 2 methyl propene to tert butyl bromide
Answer» ANSWER: EASILY...use AQUEOUS BROMINE or HBr..

37.

Convert 2 methyl propene to tert butyl bromide

Answer»

ANSWER:

EASILY...use AQUEOUS BROMINE or HBr..

Discussion

38.	Name the state of matter in which all molecules are arranged very close to each other
Answer» ANSWER: PLEASE GIVE me the answer this question Explanation:

38.

Name the state of matter in which all molecules are arranged very close to each other

Answer»

ANSWER:

PLEASE GIVE me the answer this question

Explanation:

Discussion

39.	What do you mean by oxidation and reduction in terms of oxygen
Answer» ANSWER: OXIDATION is loss of electrons, GAIN of OXYGEN or loss of hydrogen. REDUCTION is gain of electrons, loss of oxygen or gain or hydrogen.

39.

What do you mean by oxidation and reduction in terms of oxygen

Answer»

ANSWER:

OXIDATION is loss of electrons, GAIN of OXYGEN or loss of hydrogen. REDUCTION is gain of electrons, loss of oxygen or gain or hydrogen.

Discussion

40.	If the pressure of a system is halved,then volume of the gas at isotherm is(A) halved to initial (B) trice to initial (C) double to initial (D) remains constant
Answer» ANSWER: DOUBLE to INITIAL is the answer

40.

If the pressure of a system is halved,then volume of the gas at isotherm is(A) halved to initial (B) trice to initial (C) double to initial (D) remains constant

Answer»

ANSWER:

DOUBLE to INITIAL is the answer

Discussion

41.	An aqueous solution of K3(Fe(cn)6)conducts current .why?
Answer» Answer: because of K3 FE CN 6 conducts

41.

An aqueous solution of K3(Fe(cn)6)conducts current .why?

Answer»

Answer:

because of K3 FE CN 6 conducts

Discussion

42.	Which is the symbol of Cs?
Answer» ANSWER: CS is a CHEMICAL SYMBOL for CAESIUM.

42.

Which is the symbol of Cs?

Answer»

ANSWER:

CS is a CHEMICAL SYMBOL for CAESIUM.

Discussion

43.	Identify the following compounds/ions as acids or bases : Cl-, NH4+, HSO4- .
Answer» ANSWER: CL- : Chlorine NH4+ : Ammonium HSO4- : HYDROGEN SULFATE EXPLANATION:

43.

Identify the following compounds/ions as acids or bases : Cl-, NH4+, HSO4- .

Answer»

ANSWER:

CL- : Chlorine
NH4+ : Ammonium
HSO4- : HYDROGEN SULFATE

EXPLANATION:

Discussion

44.	Difference between gel and water..!no copy paste ❌no spam..❌ಥ_ಥ ಥ_ಥ
Answer» Answer: Gels are colloids (aggregates of fine particles, as described above, dispersed in a continuous medium) in which the liquid medium has become viscous enough to behave more or less as a solid. Contraction of a GEL, causing separation of liquid from it, is called syneresis. Compare SOL. Gel. Quick Facts. Water, a substance COMPOSED of the chemical elements hydrogen and oxygen and EXISTING in gaseous, liquid, and solid STATES. ... It is one of the most plentiful and essential of compounds. A tasteless and odourless liquid at room temperature, it has the important ability to dissolve many other substances.

44.

Difference between gel and water..!no copy paste ❌no spam..❌ಥ_ಥ ಥ_ಥ

Answer»

Answer:

Gels are colloids (aggregates of fine particles, as described above, dispersed in a continuous medium) in which the liquid medium has become viscous enough to behave more or less as a solid. Contraction of a GEL, causing separation of liquid from it, is called syneresis. Compare SOL. Gel. Quick Facts.

Water, a substance COMPOSED of the chemical elements hydrogen and oxygen and EXISTING in gaseous, liquid, and solid STATES. ... It is one of the most plentiful and essential of compounds. A tasteless and odourless liquid at room temperature, it has the important ability to dissolve many other substances.

Discussion

45.	Measurable properties of gases are(A) Amount of gas (B) volume of gas (C) temperature of gas (D) all of the above
Answer» COLUMN of gas is the correct ANSWER *HOPE* I *HELP* *YOU*

45.

Measurable properties of gases are(A) Amount of gas (B) volume of gas (C) temperature of gas (D) all of the above

Answer»

COLUMN of gas is the correct ANSWER

HOPE I HELP YOU

Discussion

46.	Will the compound NH3 acts as an acid or a base? justify your answer in line with the Bronsted- Lowry Theory.
Answer» Answer: base Explanation: Substance which gives base when DISSOLVED in water is KNOWN as base,according to Arrhenius theory. NH₃ gives NH₄OH ,when dissolved in water. NH₃ reacts with MINERAL acids to form ammonium salts,this is also measure of basicity. More importantly lone PAIR on nitrogwn can be donated EASILY. According to Lewis theory donar of electron pair is base.Thus NH₃ is a base.

46.

Will the compound NH3 acts as an acid or a base? justify your answer in line with the Bronsted- Lowry Theory.

Answer»

Answer:

base

Explanation:

Substance which gives base when DISSOLVED in water is KNOWN as base,according to Arrhenius theory. NH₃ gives NH₄OH ,when dissolved in water.

NH₃ reacts with MINERAL acids to form ammonium salts,this is also measure of basicity.

More importantly lone PAIR on nitrogwn can be donated EASILY. According to Lewis theory donar of electron pair is base.Thus NH₃ is a base.

Discussion

47.	Express in scientific notation 0.00030402
Answer» Answer: *3.040210^-3 ..................................**

47.

Express in scientific notation 0.00030402

Answer»

Answer:

3.0402*10^-3

..................................

Discussion

48.	A metallic carbonate stable towards heat is: a- Cuco3 b-Znco3 c-na2co3 d-caco3
Answer» $Na_{2}CO_{3}$ : Sodium Carbonate is a metallic carbonate stable towards heat. Sodium carbonate is a metallic carbonate formed by group 1 element of the modern periodic table. It is thermally stable and doesn't undergo any decomposition in presence of heat. This is mainly DUE to small size of sodium ion ALONG with ELECTROPOSITIVITY which results in a high lattice enthalpy. Hence , it is thermally stable. However the other metallic carbonates given in the options undergo THERMAL decomposition to PRODUCE metallic oxides. For example: $\boxed{\sf{ZnCO_{3}\overset{\Delta}{\longrightarrow}ZnO + CO_{2}}}$ Hope It Helps.

48.

A metallic carbonate stable towards heat is: a- Cuco3 b-Znco3 c-na2co3 d-caco3

Answer»

$Na_{2}CO_{3}$ : Sodium Carbonate is a metallic carbonate stable towards heat.

Sodium carbonate is a metallic carbonate formed by group 1 element of the modern periodic table.

It is thermally stable and doesn't undergo any decomposition in presence of heat.

This is mainly DUE to small size of sodium ion ALONG with ELECTROPOSITIVITY which results in a high lattice enthalpy.

Hence , it is thermally stable.

However the other metallic carbonates given in the options undergo THERMAL decomposition to PRODUCE metallic oxides.

For example:

$\boxed{\sf{ZnCO_{3}\overset{\Delta}{\longrightarrow}ZnO + CO_{2}}}$

Hope It Helps.

Discussion

49.	Express in scientific notation 0.000025
Answer» ANSWER: 2.5×10^-5 is the answer

49.

Express in scientific notation 0.000025

Answer»

ANSWER:

2.5×10^-5 is the answer

Discussion

50.	Distinguish between electronic and electrolytic conductors
Answer» Answer: $\huge\rm\underline\purple{Answer:-}$ Metallic conductors : These are the METALS which contain free ELECTRON for conduction of electricity hence metallic conductor is a good conductor of heat and electricity. Electrolytic conductors : These are the conductors which contain ions for conduction. Hence CONDUCTANCE INCREASES with increase of temperature. $Hope ItHope ItHope ItHelpsHelpsHelpsbody {padding-left: 30%;padding-top: 5%;}.container {width: 200px;height: 200px;position: relative;-webkit-perspective: 1000px;-moz-perspective: 1000px;}#cube {width: 100%;height: 100%;position: absolute;-webkit-transform-style: preserve-3d;-webkit-animation: rotatecube 10s infinite;-moz-transform-style: preserve-3d;-moz-animation: rotatecube 10s infinite;}#cube div {width: 200px;height: 200px;display: block;position: absolute;border: none;line-height: 200px;text-align: center;font-size: 50px;font-weight: bold;}@-webkit-keyframes rotatecube {0% { -webkit-transform: rotateX(0deg) rotateY(360deg) rotateZ(90deg); }25% { -webkit-transform: rotateX(90deg) rotateY(270deg) rotateZ(180deg); }50% { -webkit-transform: rotateX(180deg) rotateY(180deg) rotateZ(0deg); }75% { -webkit-transform: rotateX(270deg) rotateY(90deg) rotateZ(360deg); }100% { -webkit-transform: rotateX(360deg) rotateY(0deg) rotateZ(270deg); }}@-moz-keyframes rotatecube {0% { -moz-transform: rotateX(0deg) rotateY(360deg) rotateZ(90deg); }25% { -moz-transform: rotateX(90deg) rotateY(270deg) rotateZ(180deg); }50% { -moz-transform: rotateX(180deg) rotateY(180deg) rotateZ(0deg); }75% { -moz-transform: rotateX(270deg) rotateY(90deg) rotateZ(360deg); }100% { -moz-transform: rotateX(360deg) rotateY(0deg) rotateZ(270deg); }}.front {background: rgba(255,0,0,.5);}.back {background: rgba(0,255,0,.5);}.right {background: rgba(0,0,255,.5);}.left {background: rgba(0,255,255,.5);}.top {background: rgba(255,0,255,.5);}.bottom {background: rgba(255,255,0,.5);}#cube .front {-webkit-transform: rotateY(0deg ) translateZ( 100px );-moz-transform: rotateY( 0deg ) translateZ( 100px );}#cube .back {-webkit-transform: rotateX( 180deg ) translateZ( 100px );-moz-transform: rotateX( 180deg ) translateZ( 100px );}#cube .right {-webkit-transform: rotateY( 90deg ) translateZ( 100px );-moz-transform: rotateY( 90deg ) translateZ( 100px );}#cube .left {-webkit-transform: rotateY( -90deg ) translateZ( 100px );-moz-transform: rotateY( -90deg ) translateZ( 100px );}#cube .top {-webkit-transform: rotateX( 90deg ) translateZ( 100px );-moz-transform: rotateX( 90deg ) translateZ( 100px );}#cube .bottom {-webkit-transform: rotateX( -90deg ) translateZ( 100px );-moz-transform: rotateX( -90deg ) translateZ( 100px );}$

50.

Distinguish between electronic and electrolytic conductors

Answer»

Answer:

$\huge\rm\underline\purple{Answer:-}$ Metallic conductors : These are the METALS which contain free ELECTRON for conduction of electricity hence metallic conductor is a good conductor of heat and electricity. Electrolytic conductors : These are the conductors which contain ions for conduction. Hence CONDUCTANCE INCREASES with increase of temperature. $Hope ItHope ItHope ItHelpsHelpsHelpsbody {padding-left: 30%;padding-top: 5%;}.container {width: 200px;height: 200px;position: relative;-webkit-perspective: 1000px;-moz-perspective: 1000px;}#cube {width: 100%;height: 100%;position: absolute;-webkit-transform-style: preserve-3d;-webkit-animation: rotatecube 10s infinite;-moz-transform-style: preserve-3d;-moz-animation: rotatecube 10s infinite;}#cube div {width: 200px;height: 200px;display: block;position: absolute;border: none;line-height: 200px;text-align: center;font-size: 50px;font-weight: bold;}@-webkit-keyframes rotatecube {0% { -webkit-transform: rotateX(0deg) rotateY(360deg) rotateZ(90deg); }25% { -webkit-transform: rotateX(90deg) rotateY(270deg) rotateZ(180deg); }50% { -webkit-transform: rotateX(180deg) rotateY(180deg) rotateZ(0deg); }75% { -webkit-transform: rotateX(270deg) rotateY(90deg) rotateZ(360deg); }100% { -webkit-transform: rotateX(360deg) rotateY(0deg) rotateZ(270deg); }}@-moz-keyframes rotatecube {0% { -moz-transform: rotateX(0deg) rotateY(360deg) rotateZ(90deg); }25% { -moz-transform: rotateX(90deg) rotateY(270deg) rotateZ(180deg); }50% { -moz-transform: rotateX(180deg) rotateY(180deg) rotateZ(0deg); }75% { -moz-transform: rotateX(270deg) rotateY(90deg) rotateZ(360deg); }100% { -moz-transform: rotateX(360deg) rotateY(0deg) rotateZ(270deg); }}.front {background: rgba(255,0,0,.5);}.back {background: rgba(0,255,0,.5);}.right {background: rgba(0,0,255,.5);}.left {background: rgba(0,255,255,.5);}.top {background: rgba(255,0,255,.5);}.bottom {background: rgba(255,255,0,.5);}#cube .front {-webkit-transform: rotateY(0deg ) translateZ( 100px );-moz-transform: rotateY( 0deg ) translateZ( 100px );}#cube .back {-webkit-transform: rotateX( 180deg ) translateZ( 100px );-moz-transform: rotateX( 180deg ) translateZ( 100px );}#cube .right {-webkit-transform: rotateY( 90deg ) translateZ( 100px );-moz-transform: rotateY( 90deg ) translateZ( 100px );}#cube .left {-webkit-transform: rotateY( -90deg ) translateZ( 100px );-moz-transform: rotateY( -90deg ) translateZ( 100px );}#cube .top {-webkit-transform: rotateX( 90deg ) translateZ( 100px );-moz-transform: rotateX( 90deg ) translateZ( 100px );}#cube .bottom {-webkit-transform: rotateX( -90deg ) translateZ( 100px );-moz-transform: rotateX( -90deg ) translateZ( 100px );}$

Discussion

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