52639 + Interview Questions in Secondary School in Chemistry

1.	What is resource?? bolna
Answer» A RESOURCE is a source or supply from which a BENEFIT is produced. ... Typically resources are materials, energy, services, staff, knowledge, or other ASSETS that are transformed to produce benefit and in the process MAY be CONSUMED or made unavailable

Discussion

2.	What is called the water used for injection?
Answer» ANSWER: anasthesia Explanation:

2.

What is called the water used for injection?

Answer»

ANSWER:

anasthesia

Explanation:

Discussion

3.	(9.1 ×10 ⁵)-(3.8 × 10²)plz answer this....I will mark brainliest answer
Answer» 91000-380=90620 Explanation: 91000-380

3.

(9.1 ×10 ⁵)-(3.8 × 10²)plz answer this....I will mark brainliest answer

Answer»

91000-380=90620

Explanation:

91000-380

Discussion

4.	Define the following terms: Mass number
Answer» The sum of the numbers of PROTONS and NEUTRONS present in the nucleus of an ATOM is called mass NUMBER

Discussion

5.	if the value of a & b is zero for gas than the gas is; A- ideal B- non ideal C- real D- b & c
Answer» Answer: Correct option is B Hydrogen and HELIUM are more compressible than ideal gases for all values of pressure. D The compressibility factor of real gases is independent of temperature. At high pressure, the gas molecules come close to each other and the empty SPACE between the molecules is reduced to some extent. Therefore the gas becomes less compressible at these higher pressures. From real gas equation, (P+ nV 2 a )(V−nb)=RT At high pressure the factor nV 2 a is negligible COMPARE to P. Thus the equation becomes, P(V−nb)=RT⇒Z= RT P(V−nb) >1 Hence at high pressure, all real gases are less compressible than ideal gases. Option A is correct. He and H 2 are less compressible than ideal gas because in case of He and H 2 the compressibility factor is Z>1. Only for low pressure and high volume the given statement is favourable. Hence option B is incorrect. He and H 2 are exceptional cases due to their small SIZE, the intermolecular attraction force are negligible. Therefore even at low pressure the volume factor is high so the compressibility factor Z>1. Option C is correct. The compressibility factor, Z∝ T 1 . Higher the temperature lower the deviation from ideal gas, Z→1. Option D is incorrect. Option B and D are the answer.

5.

if the value of a & b is zero for gas than the gas is; A- ideal B- non ideal C- real D- b & c

Answer»

Answer:

Correct option is

B

Hydrogen and HELIUM are more compressible than ideal gases for all values of pressure.

D

The compressibility factor of real gases is independent of temperature.

At high pressure, the gas molecules come close to each other and the empty SPACE between the molecules is reduced to some extent. Therefore the gas becomes less compressible at these higher pressures.

From real gas equation,

(P+

nV

2

a

)(V−nb)=RT

At high pressure the factor

nV

2

a

is negligible COMPARE to P. Thus the equation becomes,

P(V−nb)=RT⇒Z=

RT

P(V−nb)

>1

Hence at high pressure, all real gases are less compressible than ideal gases.

Option A is correct.

He and H

2

are less compressible than ideal gas because in case of He and H

2

the compressibility factor is Z>1. Only for low pressure and high volume the given statement is favourable. Hence option B is incorrect.

He and H

2

are exceptional cases due to their small SIZE, the intermolecular attraction force are negligible. Therefore even at low pressure the volume factor is high so the compressibility factor Z>1. Option C is correct.

The compressibility factor, Z∝

T

1

. Higher the temperature lower the deviation from ideal gas, Z→1. Option D is incorrect.

Option B and D are the answer.

Discussion

6.	Mehak di app kha rhte honor ujjwal bro kha rhte hai please.tell
Answer» ANSWER: mai Assam mai REHTE hu aur UJJWAL kota mai aap mere bestu ho mereko dii MAT bolo

6.

Mehak di app kha rhte honor ujjwal bro kha rhte hai please.tell

Answer»

ANSWER:

mai Assam mai REHTE hu aur UJJWAL kota mai

aap mere bestu ho mereko dii MAT bolo

Discussion

7.	a candle burns with a flame whereas charcoal burns without a flame. give reasons for this statement.
Answer» EXPLANATION: Sarah goes to BASKETBALL practice after school. 2. Meera and Ram LIKE to bake cookies together. 3. The family drove to the Icecream store after dinner. 4. I studied for my maths test. 5. The dog chases the cat around the yard. 6. The doctor gave me MEDICINE. 7. My

7.

a candle burns with a flame whereas charcoal burns without a flame. give reasons for this statement.

Answer»

EXPLANATION:

Sarah goes to BASKETBALL practice after school. 2. Meera and Ram LIKE to bake cookies together. 3. The family drove to the Icecream store after dinner. 4. I studied for my maths test. 5. The dog chases the cat around the yard. 6. The doctor gave me MEDICINE. 7. My

Discussion

8.	Balance the chemical equation:
Answer» $PbO + 2 HNO3$ → $Pb(NO3)2 + H2O$ AgNO3+NaCl → AgCl+NaNO3 both the equation are already BALANCED PLEASE mark me brain mark LIST

8.

Balance the chemical equation:

Answer»

$PbO + 2 HNO3$ → $Pb(NO3)2 + H2O$

AgNO3+NaCl → AgCl+NaNO3

both the equation are already BALANCED

PLEASE mark me brain mark LIST

Discussion

9.	गैस प्रोड्यूस्ड ड्यूरिंग पल्सर
Answer»

Discussion

10.	Confirm that 58.8g of potassium dichromate is equivalent to 0.200 moles of potassium dichromate
Answer»

Discussion

11.	(i) 1s^ 2 2s^ 2 2p 3s^ 2 3p6 3d4 4s^ 2 (ii) 1s^ 2 2s^ 2 2p63s^ 2 3p^ 6 3d^ 5 4s^ 1 Which among these is the correct electronic configuration? Give reason.
Answer» ANSWER: ii) 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d⁵ it is the correct electronic configuration and is of Chromium(Cr). Here the HALF FILLED d-orbital is PROVIDING more stability to the atom than the full filled s-orbital. Thus electrons filled up LIKE so. hope this will help you

11.

(i) 1s^ 2 2s^ 2 2p 3s^ 2 3p6 3d4 4s^ 2 (ii) 1s^ 2 2s^ 2 2p63s^ 2 3p^ 6 3d^ 5 4s^ 1 Which among these is the correct electronic configuration? Give reason.

Answer»

ANSWER:

ii) 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d⁵ it is the correct electronic configuration and is of Chromium(Cr). Here the HALF FILLED d-orbital is PROVIDING more stability to the atom than the full filled s-orbital. Thus electrons filled up LIKE so.

hope this will help you

Discussion

12.	தனிமவரிசை அட்டவணை முதல் 50க்கு அணுஎண் (ம) குறியீடு(ம) தொகுதிகள் in tamil
Answer» In mathematics and physics, a vector is an element of a vector space. For many specific vector SPACES, the vectors have RECEIVED specific names, which are listed below. Historically, vectors were introduced in GEOMETRY and physics before the formalization of the concept of vector space.

Discussion

13.	In the reactionzn (s) + 2 HCL is (aq) zncl2 (aq) + h² (g)what mass HCL is required to react completely with 4.25 moles of zinc
Answer» ANSWER: DOUBLE the MOLES Explanation: the TOTAL moles REQUIRED are 8.50

13.

In the reactionzn (s) + 2 HCL is (aq) zncl2 (aq) + h² (g)what mass HCL is required to react completely with 4.25 moles of zinc

Answer»

ANSWER:

DOUBLE the MOLES

Explanation:

the TOTAL moles REQUIRED are 8.50

Discussion

14.	What is the diffrence between uniform velocity and constant velocity??
Answer» ANSWER: Whose MAGNITUDE INCREASES with equal intervals of TIME.

14.

What is the diffrence between uniform velocity and constant velocity??

Answer»

ANSWER:

Whose MAGNITUDE INCREASES with equal intervals of TIME.

Discussion

15.	.In the following, a statement of assertion (A) and its reason ( R ) is given below. Choose the correct option. Assertion: Burning of coal is a physical change. Reason: When coal is burnt, the chief component, carbon is changed to carbon dioxide. This process cannot be reversed. (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is NOT the correct explanation of A. (c) A is true but R is false. (d) A is false but R is true
Answer» ANSWER: a both a and b are TRUE and R is the CORRECT explanation of A

15.

.In the following, a statement of assertion (A) and its reason ( R ) is given below. Choose the correct option. Assertion: Burning of coal is a physical change. Reason: When coal is burnt, the chief component, carbon is changed to carbon dioxide. This process cannot be reversed. (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is NOT the correct explanation of A. (c) A is true but R is false. (d) A is false but R is true

Answer»

ANSWER:

a both a and b are TRUE and R is the CORRECT explanation of A

Discussion

16.	Writer and the position
Answer» ANSWER: of what Explanation: you should WRITE in FULL SENTENCES

16.

Writer and the position

Answer»

ANSWER:

of what

Explanation:

you should WRITE in FULL SENTENCES

Discussion

17.	collected over was 505 litre of hydrogen water at 22°C on a day when the pressure was 156 mm of hg. What volume will the day hydrogen occupy at ST anyone help me fast plz.
Answer» EXPLANATION: HI marketing and I have to do the same to you as WELL as the class is not a problem with the subscribers of the same as shown in the morning

17.

collected over was 505 litre of hydrogen water at 22°C on a day when the pressure was 156 mm of hg. What volume will the day hydrogen occupy at ST anyone help me fast plz.

Answer»

EXPLANATION:

HI marketing and I have to do the same to you as WELL as the class is not a problem with the subscribers of the same as shown in the morning

Discussion

18.	Can anyone solve the problems
Answer» Answer: Let the intercepts cut by the given line on the AXES be a and B. It is given that, a+b= 1....(1) and ab=−6....(2) On solving equation (1) and (2), we obtain a=3 and b=−2 or a=−2 and b=3 It is known that the equation of the line whose intercepts on the axes are a and b is a x + b y =1 or bx+ay−ab=0. case1: a=3 and b=−2 In this case the equation of the line is −2x+3y+6=0⇒2x−3y=6 case2: a=−2 and b=3 In this case the equation of line is 3x−2y+6=0⇒−3x+2y=6 Thus, the required equation of the lines are 2x−3y=6 and −3x+2y=6.

18.

Can anyone solve the problems

Answer»

Answer:

Let the intercepts cut by the given line on the AXES be a and B.

It is given that,

a+b= 1....(1)

and ab=−6....(2)

On solving equation (1) and (2), we obtain

a=3 and b=−2 or a=−2 and b=3

It is known that the equation of the line whose intercepts on the axes are a and b is

a

x

+

b

y

=1 or bx+ay−ab=0.

case1: a=3 and b=−2

In this case the equation of the line is −2x+3y+6=0⇒2x−3y=6

case2: a=−2 and b=3

In this case the equation of line is 3x−2y+6=0⇒−3x+2y=6

Thus, the required equation of the lines are 2x−3y=6 and −3x+2y=6.

Discussion

19.	An element has 2 shells and belongs to 2nd group .Find the atomic no. and write the subshellelectronic configuration.
Answer» ANSWER: Three shells are K,L,M. The SUBSHELLS are 1s,2s,2P,3S,2p,3d Group number: 17 Electrons in last SHELL: 7 Shell electronic configuration 2,8,7 Sub-shell electronic configuration 1s 2 ,2s 2 ,2p 6 ,3s 2 ,3p 5 Explanation: was this helpful Mark as brainlist

19.

An element has 2 shells and belongs to 2nd group .Find the atomic no. and write the subshellelectronic configuration.

Answer»

ANSWER:

Three shells are K,L,M. The SUBSHELLS are 1s,2s,2P,3S,2p,3d

Group number: 17

Electrons in last SHELL: 7

Shell electronic configuration 2,8,7

Sub-shell electronic configuration 1s

2 ,2s 2 ,2p 6 ,3s 2 ,3p 5

Explanation:

was this helpful

Mark as brainlist

Discussion

20.	Assertion (A) : The acid must always be added to water with constant stirring.Reason (R) : Mixing of an acid with water decreases the concentration of H+ ions per unit volume. *
Answer» Explanation: it's not correct reason for it . when we ADD WATER in the acid it will be HIGHLY exothermic reaction which will be dangerous so we must add acid in the water because it's not dangerous

20.

Assertion (A) : The acid must always be added to water with constant stirring.Reason (R) : Mixing of an acid with water decreases the concentration of H+ ions per unit volume. *

Answer»

Explanation:

it's not correct reason for it . when we ADD WATER in the acid it will be HIGHLY exothermic reaction which will be dangerous so we must add acid in the water because it's not dangerous

Discussion

21.	The water of crystallization in Epsom salt is _______ . (a)2 (b)5 (c)7 (d)10
Answer» The number of water molecules bound PER metal ion is often characteristic of that particular metal ion. One of the COMMON hydrates is HYDRATED MAGNESIUM sulfate (Epsom salt). ... When Epsom salts are heated, their water of crystallization is DRIVEN off, leaving anhydrous magnesium sulphate, MgSO^4. please mark me brain mark list

21.

The water of crystallization in Epsom salt is _______ . (a)2 (b)5 (c)7 (d)10

Answer»

The number of water molecules bound PER metal ion is often characteristic of that particular metal ion. One of the COMMON hydrates is HYDRATED MAGNESIUM sulfate (Epsom salt). ... When Epsom salts are heated, their water of crystallization is DRIVEN off, leaving anhydrous magnesium sulphate, MgSO^4.

please mark me brain mark list

Discussion

22.	What is the frequency of wave with time period 0.025second?
Answer» ANSWER: Given : TIME PERIOD =0.025 sec . => 1÷0.025 = 40 HZ . ➡Frequency = 40 Hz

22.

What is the frequency of wave with time period 0.025second?

Answer»

ANSWER:

Given : TIME PERIOD =0.025 sec . => 1÷0.025 = 40 HZ . ➡Frequency = 40 Hz

Discussion

23.	Barium has a bcc unit cell with a length of 508pm along an edge.what is the density of barium in g cm^3
Answer» ANSWER: edge length of unit cell = 508 pm so, volume of unit cell = (508pm)³ = 1.31096512 × 10^(-36 + 8) m³ ≈ 1.3 × 10^-28 m³ a/c to question, barium has a body centered cubic unit cell. so NUMBER of barium atom in a unit cell = 2. so, volume of a barium atom = volume of unit cell/2 = 1.3 × 10^-28/2 m³ = 0.65 × 10^-28 m³ volume of one mole of barium atoms, V = 6.022 × 10²³ × 0.65 × 10^-28 m³ = 3.9143 × 10^-5 m³ [ as we KNOW, 1 m³ = 10^6 cm³ ] = 39.143 cm³ atomic mass of barium = 137.327 g so, density of barium = atomic mass of barium/volume of one mole of barium atom = 137.327/39.143 g/cm³ ≈ 3.51 g/cm³ plz mark me brainliest

23.

Barium has a bcc unit cell with a length of 508pm along an edge.what is the density of barium in g cm^3

Answer»

ANSWER:

edge length of unit cell = 508 pm

so, volume of unit cell = (508pm)³

= 1.31096512 × 10^(-36 + 8) m³

≈ 1.3 × 10^-28 m³

a/c to question, barium has a body centered cubic unit cell.

so NUMBER of barium atom in a unit cell = 2.

so, volume of a barium atom = volume of unit cell/2 = 1.3 × 10^-28/2 m³

= 0.65 × 10^-28 m³

volume of one mole of barium atoms, V = 6.022 × 10²³ × 0.65 × 10^-28 m³

= 3.9143 × 10^-5 m³

[ as we KNOW, 1 m³ = 10^6 cm³ ]

= 39.143 cm³

atomic mass of barium = 137.327 g

so, density of barium = atomic mass of barium/volume of one mole of barium atom

= 137.327/39.143 g/cm³

≈ 3.51 g/cm³

plz mark me brainliest

Discussion

24.	10. From the list given below select the correct substance which is most suitable to the statements given : [oxygen, diamond, zinc, graphite, gold] (a) A metal which is brittle. (b) A non-metal which is a good conductor of electricity. noms (c) The hardest naturally occurring substance. (d) The most ductile metal. (e) A gaseous non-metal.
Answer» 053c253f451f1f3116123e3c7902344a6b3e071f5a12524d023e05035e7d5c3334192c191d7a28210916077c1803173d3124

Discussion

25.	10.(b)Classify the following into elements, compounds andmixtures.(a) SodiumSoil(c) Sugar solution(d) Silver(e) Calcium carbonate(f) Tin(g) Silicon(h)Coal(i)Air(j)Soap(k)Methane(l)Carbon dioxide(m)blood
Answer» ANSWER: Sodium - element SOIL- mixture Sugar SOLUTION - mixture SILVER - element Calcium carbonate - COMPOUND Tin- element Silicon - element Coal- element Air- mixture Soap - compound Methane - compound Carbon dioxide - compound Blood- compound

25.

10.(b)Classify the following into elements, compounds andmixtures.(a) SodiumSoil(c) Sugar solution(d) Silver(e) Calcium carbonate(f) Tin(g) Silicon(h)Coal(i)Air(j)Soap(k)Methane(l)Carbon dioxide(m)blood

Answer»

ANSWER:

Sodium - element

SOIL- mixture

Sugar SOLUTION - mixture

SILVER - element

Calcium carbonate - COMPOUND

Tin- element

Silicon - element

Coal- element

Air- mixture

Soap - compound

Methane - compound

Carbon dioxide - compound

Blood- compound

Discussion

26.	80g NaOH was added to 2 water. Find molality of solution if density of water = 1g/mL
Answer» ANSWER: of NaOH mass of H 2 O × 1000 = 80 / 40 2 × 1000 × 1000 = 1 molal

26.

80g NaOH was added to 2 water. Find molality of solution if density of water = 1g/mL

Answer»

ANSWER:

of NaOH

mass of

H

2

O

×

1000

=

80

/

40

2

×

1000

×

1000

=

1

molal

Discussion

27.	Differentiate between rusting of iron and rusting of copper
Answer» Answer: With iron, reddish flakes form when it rusts. The CHEMICAL equation in words is-- iron plus water plus oxygen forms rust. In symbols, it is 4(Fe)+ 6 H2O+ 3 O2 forms 4Fe(0H)3 which is rust. ... In other words, copper plus oxygen forms copper oxide. Explanation: I hope this answer help you. Follow for more answers.

27.

Differentiate between rusting of iron and rusting of copper

Answer»

Answer:

With iron, reddish flakes form when it rusts. The CHEMICAL equation in words is-- iron plus water plus oxygen forms rust. In symbols, it is 4(Fe)+ 6 H2O+ 3 O2 forms 4Fe(0H)3 which is rust. ... In other words, copper plus oxygen forms copper oxide.

Explanation:

I hope this answer help you. Follow for more answers.

Discussion

28.	what do you understand by homologous and analogous organs.how do they help us in understanding the process of evolution?
Answer» Explanation: Analogous ORGANS: Organs which performs similar FUNCTION but are different in STRUCTURE and origin. Example - wings of a bird and wings of an INSECT. Homologous Organ: Organs which have different functions but similar structure and origin. Example - fore arm of frog, lizard, bird and human.

28.

what do you understand by homologous and analogous organs.how do they help us in understanding the process of evolution?

Answer»

Explanation:

Analogous ORGANS: Organs which performs similar FUNCTION but are different in STRUCTURE and origin. Example - wings of a bird and wings of an INSECT. Homologous Organ: Organs which have different functions but similar structure and origin. Example - fore arm of frog, lizard, bird and human.

Discussion

29.	What is science ?good evening guys
Answer» GOOD evening vaise aj is I'd DI yaad kida AA GYE !!!

29.

What is science ?good evening guys

Answer»

GOOD evening

vaise aj is I'd DI yaad kida AA GYE !!!

Discussion

30.	Explain the non linear shape of H2O and non planar shape of PCl3 using VSEPR theory.
Answer» Answer: o JANA NA ho to vah bhi tab jabaki UNHONE swayan

30.

Explain the non linear shape of H2O and non planar shape of PCl3 using VSEPR theory.

Answer»

Answer:

o JANA NA ho to vah bhi tab jabaki UNHONE swayan

Discussion

31.	मिश्रण द्रव्य क्या है? एक उदाहरण दें
Answer» जब दो या दो से अधिक तत्वों या यौगिको को किसी भी अनिश्चित अनुपात या मात्रा में मिलाते है तो इस प्रकार बने पदार्थ को मिश्रण कहते है। उदाहरण : वायु , रेत आदि। वायु एक मिश्रण है क्यूंकि इसमें विभिन्न प्रकार के अवयव होते है जैसे ऑक्सीजन , कार्बन डाई ऑक्साइड।

31.

मिश्रण द्रव्य क्या है? एक उदाहरण दें

Answer»

जब दो या दो से अधिक तत्वों या यौगिको को किसी भी अनिश्चित अनुपात या मात्रा में मिलाते है तो इस प्रकार बने पदार्थ को मिश्रण कहते है।

उदाहरण : वायु , रेत आदि। वायु एक मिश्रण है क्यूंकि इसमें विभिन्न प्रकार के अवयव होते है जैसे ऑक्सीजन , कार्बन डाई ऑक्साइड।

Discussion

32.	Chemistryमुझे नहीं आता कोई हो तो पढ़ा दीजिए
Answer» ANSWER: can I HELP you to SOLVE CHEMISTRY

32.

Chemistryमुझे नहीं आता कोई हो तो पढ़ा दीजिए

Answer»

ANSWER:

can I HELP you to SOLVE CHEMISTRY

Discussion

33.	What is the principle of the method of separation called Centrifugation?Army please!!! answer my questions Tomorrow is my chemistry test.
Answer» ANSWER: the principle centrifugation is the technique USED for the SEPARATION of particles from a solution according to the size, SHAPE,density, viscosity of the medium and rotor speed. centrifugation is used to separate blood cells from plasma cells. drop me as a brainlist PLEASE

33.

What is the principle of the method of separation called Centrifugation?Army please!!! answer my questions Tomorrow is my chemistry test.

Answer»

ANSWER:

the principle centrifugation is the technique USED for the SEPARATION of particles from a solution according to the size, SHAPE,density, viscosity of the medium and rotor speed.

centrifugation is used to separate blood cells from plasma cells.

drop me as a brainlist PLEASE

Discussion

34.	Assertion: 17 g of NH3 Contains 6.022 × 1023 NH3 moleculesReason: A mole is a collection of 6.022 × 1023 particlesPlease Reply Fast
Answer» Answer: 12.044×10² MOLECULES it is the SOLUTION

34.

Assertion: 17 g of NH3 Contains 6.022 × 1023 NH3 moleculesReason: A mole is a collection of 6.022 × 1023 particlesPlease Reply Fast

Answer»

Answer:

12.044×10² MOLECULES it is the SOLUTION

Discussion

35.	What is the principle of the method of separation called Centrifugation?Army please!!! answer my questionsTomorrow is my chemistry test.
Answer» Explanation: A centrifuge works by USING the principle of sedimentation: Under the influence of gravitational force (g-force), substances SEPARATE according to their DENSITY. Different types of separation are known, including isopycnic, ULTRAFILTRATION, density gradient, phase separation, and PELLETING.

35.

What is the principle of the method of separation called Centrifugation?Army please!!! answer my questionsTomorrow is my chemistry test.

Answer»

Explanation:

A centrifuge works by USING the principle of sedimentation: Under the influence of gravitational force (g-force), substances SEPARATE according to their DENSITY. Different types of separation are known, including isopycnic, ULTRAFILTRATION, density gradient, phase separation, and PELLETING.

Discussion

36.	केमिस्ट्री कहां है पढ़ा दीजिए हमें नहीं आता
Answer» Answer: MUJHE NAHI PATA hai Explanation: LEKIN brainliest answer KAR dena

36.

केमिस्ट्री कहां है पढ़ा दीजिए हमें नहीं आता

Answer»

Answer:

MUJHE NAHI PATA hai

Explanation:

LEKIN brainliest answer KAR dena

Discussion

37.	Please give me the answer of this questions
Answer» ANSWER: COPPER [ll] HYDROXIDE is it CORRECT

37.

Please give me the answer of this questions

Answer»

ANSWER:

COPPER [ll] HYDROXIDE

is it CORRECT

Discussion

38.	The temperature of a flowing gas stream is measured using a thermocouple, which is a spherical metal bead 1.5 mm in diameter. The properties of the metal are p=9000 kg/m³ , C₂ = 550 J/kg-K and k=30 W/m K. The film coefficient between the gas and the metal is 410 W/m².K. If the gas temperature is suddenly increased from 300 C to 310 °C, how long will it take for the thermocouple to reach 308 C? a) 5 sb) 2.56 sc) 3.55 sd) 4.95 s
Answer» <P>The TEMPERATURE of a flowing gas stream is measured using a thermocouple, which is a SPHERICAL metal bead 1.5 MM in diameter. The properties of the metal are p =9000 kg/m. plz mark me brainliest

38.

The temperature of a flowing gas stream is measured using a thermocouple, which is a spherical metal bead 1.5 mm in diameter. The properties of the metal are p=9000 kg/m³ , C₂ = 550 J/kg-K and k=30 W/m K. The film coefficient between the gas and the metal is 410 W/m².K. If the gas temperature is suddenly increased from 300 C to 310 °C, how long will it take for the thermocouple to reach 308 C? a) 5 sb) 2.56 sc) 3.55 sd) 4.95 s

Answer»

<P>The TEMPERATURE of a flowing gas stream is measured using a thermocouple, which is a SPHERICAL metal bead 1.5 MM in diameter. The properties of the metal are p =9000 kg/m.

plz mark me brainliest

Discussion

39.	Found Krishna Janmala by Vaishali Samant, Sonu Kakkar, Avadhoot Gupte on MX Player. Give it a go at https://www.mxplayer.in/audio/song/gt_26333492?seokey=krishna-janmala
Answer» Answer: what! who send LIKE this QUESTION Explanation: its a *question... PLS* *underatand* *you* *CAREFULLY* *look* *your* *question*

39.

Found Krishna Janmala by Vaishali Samant, Sonu Kakkar, Avadhoot Gupte on MX Player. Give it a go at https://www.mxplayer.in/audio/song/gt_26333492?seokey=krishna-janmala

Answer»

Answer:

what!

who send LIKE this QUESTION

Explanation:

its a question...

PLS underatand you CAREFULLY look your question

Discussion

40.	Calculate the mass of 3.011x1023 number of N atoms.
Answer» Answer: MOLAR mass of nitrogen is 14gm and half MOLE of nitrogen will have half of the mass that of molaar mass.therefore this will have mass EQUAL to 7GM.

40.

Calculate the mass of 3.011x1023 number of N atoms.

Answer»

Answer:

MOLAR mass of nitrogen is 14gm and half MOLE of nitrogen will have half of the mass that of molaar mass.therefore this will have mass EQUAL to 7GM.

Discussion

41.	1. The outermost sub shell electronic configuration of an element Y is 3s2 3p1(symbol is not real)a) Write the sub shell electronic configuration of this element.b) To which period and block does this element belong?c) Write the outermost subshell electronic configuration of noble belonging to same period.
Answer» Answer: 1. a) Electronic configuration of Y - 1s² 2s² 2p⁶ 3s² 3p¹ (ACCORDING to AFBAU's principle) b) As it have outer most electron in the 3rd SHELL, it belongs to 3rd period. Also it have last electron in p-subshell, THUS it belongs to p-block. c) Outermost subshell electronic configuration of noble GAS belongs to same period is 3p⁶, it is the most stable E.C of that period. hope this will help you

41.

1. The outermost sub shell electronic configuration of an element Y is 3s2 3p1(symbol is not real)a) Write the sub shell electronic configuration of this element.b) To which period and block does this element belong?c) Write the outermost subshell electronic configuration of noble belonging to same period.

Answer»

Answer:

1. a) Electronic configuration of Y - 1s² 2s² 2p⁶ 3s² 3p¹ (ACCORDING to AFBAU's principle)

b) As it have outer most electron in the 3rd SHELL, it belongs to 3rd period. Also it have last electron in p-subshell, THUS it belongs to p-block.

c) Outermost subshell electronic configuration of noble GAS belongs to same period is 3p⁶, it is the most stable E.C of that period.

hope this will help you

Discussion

42.	Is anyone know how to balance and right equation in chemistry as 12th class tell me
Answer» ANSWER: FIRST MARK me as BRAILIEST

42.

Is anyone know how to balance and right equation in chemistry as 12th class tell me

Answer»

ANSWER:

FIRST MARK me as BRAILIEST

Discussion

43.	Chlorine reacted with excess pentane and a gas which fumes on contact with air were produced. write a formula of the main product that would have been formed if but-1-ene(C4H8) had been used instead of pentane
Answer» Answer: HELLO bro PLS mark me as Brainliest

43.

Chlorine reacted with excess pentane and a gas which fumes on contact with air were produced. write a formula of the main product that would have been formed if but-1-ene(C4H8) had been used instead of pentane

Answer»

Answer:

HELLO bro PLS mark me as Brainliest

Discussion

44.	some objects and solutions when placed in the path of white light (400-800nm) apperas coloured to human eye because ??
Answer» OBJECTS appear DIFFERENT COLOURS because they absorb some colours (WAVELENGTHS) and REFLECTED or transmit other colours

44.

some objects and solutions when placed in the path of white light (400-800nm) apperas coloured to human eye because ??

Answer»

OBJECTS appear DIFFERENT COLOURS because they absorb some colours (WAVELENGTHS) and REFLECTED or transmit other colours

Discussion

45.	What is the importance of PH in everyday life.
Answer» Explanation: PH is very important in our digestive system. In the STOMACH, hydrochloric acid is secreted as food enters the stomach. It turns the pH of the stomach between 1 and 3. This pH is important for the ACTIVATION of the enzyme pepsin, which helps in the digestion of PROTEIN in food. hope it helps u if not then I am literally sorry

45.

What is the importance of PH in everyday life.

Answer»

Explanation:

PH is very important in our digestive system. In the STOMACH, hydrochloric acid is secreted as food enters the stomach. It turns the pH of the stomach between 1 and 3. This pH is important for the ACTIVATION of the enzyme pepsin, which helps in the digestion of PROTEIN in food.

hope it helps u if not then I am literally sorry

Discussion

46.	What is electron gain enthaphy??
Answer» The electron gain enthalpy refers to the AMOUNT of energy that gets released UPON the acceptance of an atom from any neutral isolated GASEOUS atom to FORM a NEGATIVE gaseous ion (anion) in the process. ... The more amount of energy released in the chemical reaction, the more the electron gain enthalpy of the element. please mark me brain mark list

46.

What is electron gain enthaphy??

Answer»

The electron gain enthalpy refers to the AMOUNT of energy that gets released UPON the acceptance of an atom from any neutral isolated GASEOUS atom to FORM a NEGATIVE gaseous ion (anion) in the process. ... The more amount of energy released in the chemical reaction, the more the electron gain enthalpy of the element.

please mark me brain mark list

Discussion

47.	The energy of Kshell near the nucleus is
Answer» Answer: Explanation: This is very different from the classical interpretation of physics, where any ENERGY value would have been allowed. The lowest energy LEVEL (the K shell) can only be occupied by two ELECTRONS, the L shell by 8 and the M shell by 18. The K shell electrons are closest to the nucleus. the ionisation energy of the K shell is 1.84 keV,the ionisation energy of the L shell is ~0.10 keV and the ionisation energy of the M shell is ~0.01 keV pls mark me the brainliest , rate and say thanks

47.

The energy of Kshell near the nucleus is

Answer»

Answer:

Explanation:

This is very different from the classical interpretation of physics, where any ENERGY value would have been allowed. The lowest energy LEVEL (the K shell) can only be occupied by two ELECTRONS, the L shell by 8 and the M shell by 18. The K shell electrons are closest to the nucleus.

the ionisation energy of the K shell is 1.84 keV,the ionisation energy of the L shell is ~0.10 keV and the ionisation energy of the M shell is ~0.01 keV

pls mark me the brainliest , rate and say thanks

Discussion

48.	Glyceraldehyde -3-phosphate is an isomer of
Answer» Answer: PLEASE MARK me brainlist Explanation: D-glyceraldehyde 3-phosphate is a glyceraldehyde 3-phosphate. It has a role as a MOUSE metabolite. It DERIVES from a D-glyceraldehyde. ... It is an enantiomer of a L-glyceraldehyde 3-phosphate. Description: D-glyceraldehyde 3-phosphate is a glyceraldehyde 3-phosphate. It has a ... Synonyms: d-glyceraldehyde 3-phosphateD-glyceraldehyde-3-phosphate591-57-1... Molecular Formula: C3H7O6P

48.

Glyceraldehyde -3-phosphate is an isomer of

Answer»

Answer:

PLEASE MARK me brainlist

Explanation:

D-glyceraldehyde 3-phosphate is a glyceraldehyde 3-phosphate. It has a role as a MOUSE metabolite. It DERIVES from a D-glyceraldehyde. ... It is an enantiomer of a L-glyceraldehyde 3-phosphate.

Description: D-glyceraldehyde 3-phosphate is a glyceraldehyde 3-phosphate. It has a ...

Synonyms: d-glyceraldehyde 3-phosphateD-glyceraldehyde-3-phosphate591-57-1...

Molecular Formula: C3H7O6P

Discussion

49.	Which choice best describes the degree of uncertainty in the measurement of 16.30 g?(a) The uncertainty cannot be determined without additional information(b) The quantity is exact (c) + 0.10 g (d) + 0.01 g
Answer» Answer: Correct option is A 164±3cm 2 Error in product of QUANTITIES: SUPPOSE x=a×b Let Δa=absolute error in measurement of a, Δb=absolute error in measurement of b, Δx=absolute error in calculation of x, i.e. product of a and b. The maximum fractional error in x is x Δx =±( a Δa + b Δb ) Percentage error in the value of x=(Percentage error in value of a)+(Percentage error in value of b) According to the problem, LENGTH l=(16.2±0.1)cm Breadth b=(10.1±0.1)cm Area A=l×b=(16.2cm)×(10.1cm)=163.62cm 2 As per the rule area will have only three significant FIGURES and error will have only one significant figure.ROUNDING off we get,area A=164cm 2 If ΔA is error in the area, then relative error is calculated as A δ4 . A Δ4 = l Δl + b Δb = 16.2cm 0.1cm + 10.1cm 0.1cm = 16.2×10.1 1.01+1.62 = 163.62 2.63 ⇒ΔA=A× 163.62 2.63 cm 2 =162.62× 163.62 2.63 =2.63cm 2 ΔA=3cm 2 (By rounding off to one significant figure) Area, A=A±ΔA(164±3)cm 2

49.

Which choice best describes the degree of uncertainty in the measurement of 16.30 g?(a) The uncertainty cannot be determined without additional information(b) The quantity is exact (c) + 0.10 g (d) + 0.01 g

Answer»

Answer:

Correct option is

A

164±3cm

2

Error in product of QUANTITIES: SUPPOSE x=a×b

Let Δa=absolute error in measurement of a,

Δb=absolute error in measurement of b,

Δx=absolute error in calculation of x, i.e. product of a and b.

The maximum fractional error in x is

x

Δx

=±(

a

Δa

+

b

Δb

)

Percentage error in the value of x=(Percentage error in value of a)+(Percentage error in value of b)

According to the problem, LENGTH l=(16.2±0.1)cm

Breadth b=(10.1±0.1)cm

Area A=l×b=(16.2cm)×(10.1cm)=163.62cm

2

As per the rule area will have only three significant FIGURES and error will have only one significant figure.ROUNDING off we get,area A=164cm

2

If ΔA is error in the area, then relative error is calculated as

A

δ4

.

A

Δ4

=

l

Δl

+

b

Δb

=

16.2cm

0.1cm

+

10.1cm

0.1cm

=

16.2×10.1

1.01+1.62

=

163.62

2.63

⇒ΔA=A×

163.62

2.63

cm

2

=162.62×

163.62

2.63

=2.63cm

2

ΔA=3cm

2

(By rounding off to one significant figure)

Area, A=A±ΔA(164±3)cm

2

Discussion

50.	This is NCERT class 9th Practical record experiment questionQuestion) To prepare a colloidal solution of sulphur and differentiate it from a true solution or a suspension on the basis of transparency and filtration.Please help me to solve this. It's urgentPlease help me to fill the observations table.
Answer» GOOD evening❤ Explanation: <U>how are u HPE you are WELL...!!

50.

This is NCERT class 9th Practical record experiment questionQuestion) To prepare a colloidal solution of sulphur and differentiate it from a true solution or a suspension on the basis of transparency and filtration.Please help me to solve this. It's urgentPlease help me to fill the observations table.

Answer»

GOOD evening❤

Explanation:

<U>how are u HPE you are WELL...!!

Discussion

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मिश्रण द्रव्य क्या है? एक उदाहरण दें​

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What is the principle of the method of separation called Centrifugation?Army please!!! answer my questionsTomorrow is my chemistry test.​

A centrifuge works by USING the principle of sedimentation: Under the influence of gravitational force (g-force), substances SEPARATE according to their DENSITY. Different types of separation are known, including isopycnic, ULTRAFILTRATION, density gradient, phase separation, and PELLETING.

केमिस्ट्री कहां है पढ़ा दीजिए हमें नहीं आता ​

Please give me the answer of this questions​

Found Krishna Janmala by Vaishali Samant, Sonu Kakkar, Avadhoot Gupte on MX Player. Give it a go at https://www.mxplayer.in/audio/song/gt_26333492?seokey=krishna-janmala​

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GOOD evening❤

What is resource?? bolna

What is called the water used for injection?

(9.1 ×10 ⁵)-(3.8 × 10²)plz answer this....I will mark brainliest answer

Define the following terms: Mass number

if the value of a & b is zero for gas than the gas is; A- ideal B- non ideal C- real D- b & c

Mehak di app kha rhte honor ujjwal bro kha rhte hai please.tell

a candle burns with a flame whereas charcoal burns without a flame. give reasons for this statement.

Balance the chemical equation:

गैस प्रोड्यूस्ड ड्यूरिंग पल्सर

(i) 1s^ 2 2s^ 2 2p 3s^ 2 3p6 3d4 4s^ 2 (ii) 1s^ 2 2s^ 2 2p63s^ 2 3p^ 6 3d^ 5 4s^ 1 Which among these is the correct electronic configuration? Give reason.

தனிமவரிசை அட்டவணை முதல் 50க்கு அணுஎண் (ம) குறியீடு(ம) தொகுதிகள் in tamil

In the reactionzn (s) + 2 HCL is (aq) zncl2 (aq) + h² (g)what mass HCL is required to react completely with 4.25 moles of zinc

What is the diffrence between uniform velocity and constant velocity??

Writer and the position

collected over was 505 litre of hydrogen water at 22°C on a day when the pressure was 156 mm of hg. What volume will the day hydrogen occupy at ST anyone help me fast plz.

Can anyone solve the problems

An element has 2 shells and belongs to 2nd group .Find the atomic no. and write the subshellelectronic configuration.

Assertion (A) : The acid must always be added to water with constant stirring.Reason (R) : Mixing of an acid with water decreases the concentration of H+ ions per unit volume. *

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10.(b)Classify the following into elements, compounds andmixtures.(a) SodiumSoil(c) Sugar solution(d) Silver(e) Calcium carbonate(f) Tin(g) Silicon(h)Coal(i)Air(j)Soap(k)Methane(l)Carbon dioxide(m)blood

80g NaOH was added to 2 water. Find molality of solution if density of water = 1g/mL

Differentiate between rusting of iron and rusting of copper

what do you understand by homologous and analogous organs.how do they help us in understanding the process of evolution?

What is science ?good evening guys

Explain the non linear shape of H2O and non planar shape of PCl3 using VSEPR theory.

मिश्रण द्रव्य क्या है? एक उदाहरण दें

Chemistryमुझे नहीं आता कोई हो तो पढ़ा दीजिए

What is the principle of the method of separation called Centrifugation?Army please!!! answer my questions Tomorrow is my chemistry test.

What is the principle of the method of separation called Centrifugation?Army please!!! answer my questionsTomorrow is my chemistry test.

केमिस्ट्री कहां है पढ़ा दीजिए हमें नहीं आता

Please give me the answer of this questions

Found Krishna Janmala by Vaishali Samant, Sonu Kakkar, Avadhoot Gupte on MX Player. Give it a go at https://www.mxplayer.in/audio/song/gt_26333492?seokey=krishna-janmala

Calculate the mass of 3.011x1023 number of N atoms.

Is anyone know how to balance and right equation in chemistry as 12th class tell me

some objects and solutions when placed in the path of white light (400-800nm) apperas coloured to human eye because ??

What is the importance of PH in everyday life.

What is electron gain enthaphy??

The energy of Kshell near the nucleus is

Glyceraldehyde -3-phosphate is an isomer of

Which choice best describes the degree of uncertainty in the measurement of 16.30 g?(a) The uncertainty cannot be determined without additional information(b) The quantity is exact (c) + 0.10 g (d) + 0.01 g