52639 + Interview Questions in Secondary School in Chemistry

1.	वर्ड इक्वेशन फॉर रिएक्टेंट्स kno3 प्रोडक्ट्स kno2 प्लस फोटो
Answer» EXPLANATION: nsnskskzlxlxlMmanakoaksq9qqlqadsh

1.

वर्ड इक्वेशन फॉर रिएक्टेंट्स kno3 प्रोडक्ट्स kno2 प्लस फोटो

Answer»

EXPLANATION:

nsnskskzlxlxlMmanakoaksq9qqlqadsh

Discussion

2.	Reduction of alkane halide
Answer» EXPLANATION: The halogen is converted to halide ANION, and the carbon BONDS to the metal (the carbon has carbanionic CHARACTER). ... Halide reactivity increases in the order: CL < Br < I.

2.

Reduction of alkane halide

Answer»

EXPLANATION:

The halogen is converted to halide ANION, and the carbon BONDS to the metal (the carbon has carbanionic CHARACTER). ... Halide reactivity increases in the order: CL < Br < I.

Discussion

3.	Iron electronic configuration
Answer» ANSWER: Ar] 3d6 4s2 Atomic number: 26 Electrons PER shell: 2, 8, 14, 2 Symbol: Fe

3.

Iron electronic configuration

Answer»

ANSWER:

Ar] 3d6 4s2

Atomic number: 26

Electrons PER shell: 2, 8, 14, 2

Symbol: Fe

Discussion

4.	Visible light travel with a velocity of
Answer» Explanation: LIGHT travels at a speed of 299,792 kilometers PER second (about 186,282 MILES per second). At this speed, light could circle Earth more than seven TIMES in one second!

4.

Visible light travel with a velocity of

Answer»

Explanation:

LIGHT travels at a speed of 299,792 kilometers PER second (about 186,282 MILES per second). At this speed, light could circle Earth more than seven TIMES in one second!

Discussion

5.	visible light consist of rays with wave length in the approximate range of plese don't say just 400 to 800 something like that i need the correct one
Answer» Answer: Visible light consists of rays with wavelengths in the approximate RANGE of 4000 A˚ to 7500 A˚. This CORRESPONDS to 4 ×10−7 m to 7.5 ×10−7 m . This also corresponds to 4 ×10−5 cm to 7.5 ×10−5 cm. This also corresponds to 400 nm to 750 nm. Explanation: mark as brainest PLS

5.

visible light consist of rays with wave length in the approximate range of plese don't say just 400 to 800 something like that i need the correct one

Answer»

Answer:

Visible light consists of rays with wavelengths in the approximate RANGE of 4000 A˚ to 7500 A˚. This CORRESPONDS to 4 ×10−7 m to 7.5 ×10−7 m . This also corresponds to 4 ×10−5 cm to 7.5 ×10−5 cm. This also corresponds to 400 nm to 750 nm.

Explanation:

mark as brainest PLS

Discussion

6.	Solve the oxidation state Rh(NH3) 3(NCS) 3
Answer» Answer: +3 Explanation: GIVEN complex compound is nuetral. NH3 is a NEUTRAL molecule. OXIDATION state of NCS is -1. let oxidation state of Rh is "X" so X + (0×3) + (-1×3) = 0 X + (-3) = 0 X - 3. = 0 X = +3. Answer.

6.

Solve the oxidation state Rh(NH3) 3(NCS) 3

Answer»

Answer:

+3

Explanation:

GIVEN complex compound is nuetral.

NH3 is a NEUTRAL molecule.

OXIDATION state of NCS is -1.

let oxidation state of Rh is "X"

so

X + (0×3) + (-1×3) = 0

X + (-3) = 0

X - 3. = 0

X = +3. Answer.

Discussion

7.	30% of a first order reaction complete in 50 minutes then calculate how much time to require 50% of a first order reaction.
Answer» Answer: Tell you LATER DEAR OK ok wait for the answer is

7.

30% of a first order reaction complete in 50 minutes then calculate how much time to require 50% of a first order reaction.

Answer»

Answer:

Tell you LATER DEAR OK ok wait for the answer is

Discussion

8.	Identify the element whose outer shell is completely filled with electronsa) Nb) Cc)Ned)Na
Answer» Answer: c means NE is CORRECT because Ne has 2,8 electronic configuration and outer sell is 8 Explanation: HOPE you UNDERSTAND my point

8.

Identify the element whose outer shell is completely filled with electronsa) Nb) Cc)Ned)Na

Answer»

Answer:

c means NE

is CORRECT because

Ne has 2,8 electronic configuration

and outer sell is 8

Explanation:

HOPE you UNDERSTAND my point

Discussion

9.	Define electroplating in short
Answer» Answer: Electroplating is basically the process of plating a METAL ONTO the other by hydrolysis MOSTLY to prevent corrosion of metal or for decorative PURPOSES. The process uses an electric current to reduce dissolved metal cations to develop a lean coherent metal coating on the electrode.

9.

Define electroplating in short

Answer»

Answer:

Electroplating is basically the process of plating a METAL ONTO the other by hydrolysis MOSTLY to prevent corrosion of metal or for decorative PURPOSES. The process uses an electric current to reduce dissolved metal cations to develop a lean coherent metal coating on the electrode.

Discussion

10.	ELECTROLYTES means what
Answer» Explanation: Electrolyte, in chemistry and physics, SUBSTANCE that CONDUCTS electric current as a result of a dissociation into positively and NEGATIVELY charged particles called ions. @By Samu__ ❤ __

10.

ELECTROLYTES means what

Answer»

Explanation:

Electrolyte, in chemistry and physics, SUBSTANCE that CONDUCTS electric current as a result of a dissociation into positively and NEGATIVELY charged particles called ions.

@By Samu__ ❤ __

Discussion

11.	What is degree of hydrogen in organic chemistry ?
Answer» ANSWER: A tertiary (3°) HYDROGEN is a hydrogen ATOM RESIDING on a tertiary carbon in an organic species. hope this HELPS you☺☺☺☺

11.

What is degree of hydrogen in organic chemistry ?

Answer»

ANSWER:

A tertiary (3°) HYDROGEN is a hydrogen ATOM RESIDING on a tertiary carbon in an organic species.

hope this HELPS you☺☺☺☺

Discussion

12.	सनाचका आर11परI, CI, Br को उनकी बढ़ती हुई सक्रियता के आधार पर लिखिए।
Answer» ANSWER: SORRY I don't know Explanation: VIKASH KUMAR DUTTA

12.

सनाचका आर11परI, CI, Br को उनकी बढ़ती हुई सक्रियता के आधार पर लिखिए।

Answer»

ANSWER:

SORRY I don't know

Explanation:

VIKASH KUMAR DUTTA

Discussion

13.	Hold one moist and one dry strip of blue litmus paper over dry HClacid gas. Which strip will turn red and why?
Answer» Answer: MOIST strip will turn red. Explanation: HCl turn BLUE litmus red only if ONE of THING is in aqueous form as HCL show acidic nature only in aqueous form as it releases hydronium ions.

13.

Hold one moist and one dry strip of blue litmus paper over dry HClacid gas. Which strip will turn red and why?

Answer»

Answer:

MOIST strip will turn red.

Explanation:

HCl turn BLUE litmus red only if ONE of THING is in aqueous form as HCL show acidic nature only in aqueous form as it releases hydronium ions.

Discussion

14.	Explain ammonolysis of alkyl halides
Answer» Explanation: When alkyl halide is HEATED with an alcoholic solution of EXCESS ammonia, it undergoes a nucleophilic SUBSTITUTION reaction in which the halogen ATOM is replaced by an amino (–NH2) group to form primary amine. ... This process of breaking of the C – X bond by ammonia is known as AMMONOLYSIS.

14.

Explain ammonolysis of alkyl halides

Answer»

Explanation:

When alkyl halide is HEATED with an alcoholic solution of EXCESS ammonia, it undergoes a nucleophilic SUBSTITUTION reaction in which the halogen ATOM is replaced by an amino (–NH2) group to form primary amine. ... This process of breaking of the C – X bond by ammonia is known as AMMONOLYSIS.

Discussion

15.	NH3 full form in chemistry
Answer» Explanation: ammonia,nh3 is a chemical name COMPOUND COMPOSED of ONE nitrogen atoms and three hydrogen atoms. HOPE this helps you mate ✨

15.

NH3 full form in chemistry

Answer»

Explanation:

ammonia,nh3 is a chemical name COMPOUND COMPOSED of ONE nitrogen atoms and three hydrogen atoms.

HOPE this helps you mate ✨

Discussion

16.	শক্তিস্তরের পার্থক্য 399.1 KJ mol^1h=6.626×10^-34 J.S হলে frequency=?,lembda=?
Answer» ANSWER: SORRY I don't know Explanation: VIKASH KUMAR DUTTA

16.

শক্তিস্তরের পার্থক্য 399.1 KJ mol^1h=6.626×10^-34 J.S হলে frequency=?,lembda=?

Answer»

ANSWER:

SORRY I don't know

Explanation:

VIKASH KUMAR DUTTA

Discussion

17.	1. The arrangement ABCABCABC is called(a) ) ) )
Answer» ANSWER: ABCABC kind of arrangement is CALLED cubic close PACKING (ccp).

17.

1. The arrangement ABCABCABC is called(a) ) ) )

Answer»

ANSWER:

ABCABC kind of arrangement is CALLED cubic close PACKING (ccp).

Discussion

18.	Find the focal length of a convex mirror whose radius of curvature is32 cm.A concave mirror produces three times magnified (enlarged) real imageof an object placed at 10 cm in front of it. Where is the image located??
Answer» ANSWER: here's UR answer hope ITZ HELPFUL

18.

Find the focal length of a convex mirror whose radius of curvature is32 cm.A concave mirror produces three times magnified (enlarged) real imageof an object placed at 10 cm in front of it. Where is the image located??

Answer»

ANSWER:

here's UR answer

hope ITZ HELPFUL

Discussion

19.	Examples of tetravaent....??
Answer» ANSWER: CARBON is an EXAMPLE of TETRAVALENT

19.

Examples of tetravaent....??

Answer»

ANSWER:

CARBON is an EXAMPLE of TETRAVALENT

Discussion

20.	Name a mirror that can give an erect and enlarged image of an object.Why do we prefer a convex mirror as a rear-view mirror in vehicles?
Answer» Explanation: SOLUTION : Concave mirror FORMS an erect, virtual and enlarged IMAGE when the object is between focus and POLE of mirror. We prefer a convex mirror as a rear-view mirror in vehicles because it gives a wider FIELD of view, which allows the driver to see most of the traffic behind him. Convex mirrors always form a virtual, erect, and diminished image of the objects placed in front of it

20.

Name a mirror that can give an erect and enlarged image of an object.Why do we prefer a convex mirror as a rear-view mirror in vehicles?

Answer»

Explanation:

SOLUTION : Concave mirror FORMS an erect, virtual and enlarged IMAGE when the object is between focus and POLE of mirror.
We prefer a convex mirror as a rear-view mirror in vehicles because it gives a wider FIELD of view, which allows the driver to see most of the traffic behind him. Convex mirrors always form a virtual, erect, and diminished image of the objects placed in front of it

Discussion

21.	The radius of curvature of a spherical mirror is 20 cm what is focal length
Answer» ANSWER: Explanation: RADIUS of CURVATURE = 2(focal length) R = 2f 20cm = 2f f = 20cm/2 = 10cm The Focal length will be 10cm.

21.

The radius of curvature of a spherical mirror is 20 cm what is focal length

Answer»

ANSWER:

Explanation:

RADIUS of CURVATURE = 2(focal length)

R = 2f

20cm = 2f

f = 20cm/2 = 10cm

The Focal length will be 10cm.

Discussion

22.	Write the products of ozonolysis of But-2-ene
Answer» jdjjsgshuakqokahsushsgssyshsh

Discussion

23.	What type of reaction is this? P₂O₃ + 3H₂O → 2H₃PO₃
Answer» ANSWER: the REACTION is 3H20 -2H

23.

What type of reaction is this? P₂O₃ + 3H₂O → 2H₃PO₃

Answer»

ANSWER:

the REACTION is 3H20 -2H

Discussion

24.	Where is the periodic table is the metallic character of the elements greatest?left or right at the top orside of a period bottom of a group A. left bottomB. left topC. right bottomD. right top
Answer» Answer: B left top Explanation: metals are at left and NON metals are at RIGHT

24.

Where is the periodic table is the metallic character of the elements greatest?left or right at the top orside of a period bottom of a group A. left bottomB. left topC. right bottomD. right top

Answer»

Answer:

B left top

Explanation:

metals are at left and NON metals are at RIGHT

Discussion

25.	101. अपठित गद्यांश को पढ़कर नीचे दिए गए प्रश्नों के उतर दै।सिका मनुष्य को मास्तिक और शरीर का उचित प्रयोग सिखाती है, वह शिक्षा जो मनुष्य को पाठ्य पुस्तकों केज्ञान के अतिरिक्त गंभीर चिंतन न दे सके व्यर्थ है। यदि हमारी शिक्षा सुसंस्कृत सचरित्र एवं अच्छे नागरिक नहीं बनासकती तो उससे क्या लाम ? सदैव सच्चा किन्तु अनपढ़ मजदूर उस स्नातक से अच्छा है जो निर्दय और चरिवहीन है।संसार के समस्त वैभव और सुख साधन भी मनुष्य को तब तक सुखी नहीं बना सकते, जब तक मनुष्यों को आत्मिकज्ञान न हो।इस कहानी का नाम क्या है
Answer» ANSWER: what Explanation: what what what what what what what what what

25.

101. अपठित गद्यांश को पढ़कर नीचे दिए गए प्रश्नों के उतर दै।सिका मनुष्य को मास्तिक और शरीर का उचित प्रयोग सिखाती है, वह शिक्षा जो मनुष्य को पाठ्य पुस्तकों केज्ञान के अतिरिक्त गंभीर चिंतन न दे सके व्यर्थ है। यदि हमारी शिक्षा सुसंस्कृत सचरित्र एवं अच्छे नागरिक नहीं बनासकती तो उससे क्या लाम ? सदैव सच्चा किन्तु अनपढ़ मजदूर उस स्नातक से अच्छा है जो निर्दय और चरिवहीन है।संसार के समस्त वैभव और सुख साधन भी मनुष्य को तब तक सुखी नहीं बना सकते, जब तक मनुष्यों को आत्मिकज्ञान न हो।इस कहानी का नाम क्या है

Answer»

ANSWER:

what

Explanation:

what what what what what what what what what

Discussion

26.	Please answer this question with proper explanation
Answer» ANSWER: answer is in the ATTACHMENT

26.

Please answer this question with proper explanation

Answer»

ANSWER:

answer is in the ATTACHMENT

Discussion

27.	Work out the oxidation number of underline element MnO-4
Answer» Answer: Sum of all the oxidation numbers in a polyatomic ION is equal to the charge on the ion. Thus, the total charge on the polyatomic anion is −1. Thus, the oxidation NUMBER of Mn in MnO−4 is +7. Explanation: LET oxidation number of Mn be x. We KNOW that, OX. no. of O=−2. So, Ox. no. Mn+ 4(Ox. no. O)=−1 x+4(−2)=−1 or x−8=−1 or x=+8−1=+7 The oxidation number of Mn in [MnO4]− ion is +7.

27.

Work out the oxidation number of underline element MnO-4

Answer»

Answer:

Sum of all the oxidation numbers in a polyatomic ION is equal to the charge on the ion. Thus, the total charge on the polyatomic anion is −1. Thus, the oxidation NUMBER of Mn in MnO−4 is +7.

Explanation:

LET oxidation number of Mn be x.

We KNOW that, OX. no. of O=−2.

So, Ox. no. Mn+ 4(Ox. no. O)=−1

x+4(−2)=−1

or x−8=−1

or x=+8−1=+7

The oxidation number of Mn in [MnO4]− ion is +7.

Discussion

28.	The number of valence electrons decreases from left to right across each period. True / false
Answer» Explanation: The number of valence electrons decreases from left to right across each period. The number of valence electrons INCREASES from top to BOTTOM within each GROUP. All of the ELEMENTS in group 9 have nine valence electrons.

28.

The number of valence electrons decreases from left to right across each period. True / false

Answer»

Explanation: The number of valence electrons decreases from left to right across each period. The number of valence electrons INCREASES from top to BOTTOM within each GROUP. All of the ELEMENTS in group 9 have nine valence electrons.

Discussion

29.	Which vitamin is not soluble in water and fat
Answer» EXPLANATION: water insoluble vitamins ADEK FAT INSOLUBLE VIT. B AND C

29.

Which vitamin is not soluble in water and fat

Answer»

EXPLANATION:

water insoluble vitamins ADEK

FAT INSOLUBLE VIT. B AND C

Discussion

30.	How do call this type of reaction, when Magnesium react with dilute nitric acid
Answer» Answer: When magnesium metal REACTS with very dilute nitric acid it gives magnesium NITRATE (Mg(NO3)2). Along with magnesium nitrate HIGHLY flammable hydrogen gas (H2) is also produced. Thus, magnesium on reaction with very dilute HNO3 gives H2. Thus, the correct OPTION is (C) H2.

30.

How do call this type of reaction, when Magnesium react with dilute nitric acid

Answer»

Answer:

When magnesium metal REACTS with very dilute nitric acid it gives magnesium NITRATE (Mg(NO3)2). Along with magnesium nitrate HIGHLY flammable hydrogen gas (H2) is also produced.

Thus, magnesium on reaction with very dilute HNO3 gives H2. Thus, the correct OPTION is (C) H2.

Discussion

31.	Show that pkw= poh + ph
Answer» EXPLANATION: ufuucyhcchchchvhvhbj

31.

Show that pkw= poh + ph

Answer»

EXPLANATION:

ufuucyhcchchchvhvhbj

Discussion

32.	What is mass silicon in 100 g of sodium silicate, Na2SiO3? [Na =23, Si =28, O =16u]
Answer» Answer: DESCRIPTION : Sodium silicate APPEARS as a powdered or flaked solid substance. Strong irritant to skin, eyes, and MUCOUS membranes. May be toxic by ingestion. Concentrated aqueous solutions USED as a GLUE. Explanation: Check out my biography

32.

What is mass silicon in 100 g of sodium silicate, Na2SiO3? [Na =23, Si =28, O =16u]

Answer»

Answer:

DESCRIPTION :

Sodium silicate APPEARS as a powdered or flaked solid substance. Strong irritant to skin, eyes, and MUCOUS membranes. May be toxic by ingestion. Concentrated aqueous solutions USED as a GLUE.

Explanation:

Check out my biography

Discussion

33.	Does Na2PO4 form an aqueous solution with pH = 7?
Answer» Answer: No it is BASIC in nature And its PH is between 8 to 11

33.

Does Na2PO4 form an aqueous solution with pH = 7?

Answer»

Answer:

No it is BASIC in nature

And its PH is between 8 to 11

Discussion

34.	What is cell voltage
Answer» 1.5V ▬▬▬▬▬▬▬▬▬▬▬▬▬▬ Cell voltage is MODELLED as the sum of the REVERSIBLE and SIGNIFICANT irreversible voltages.

34.

What is cell voltage

Answer»

1.5V

▬▬▬▬▬▬▬▬▬▬▬▬▬▬

Cell voltage is MODELLED as the sum of the REVERSIBLE and SIGNIFICANT irreversible voltages.

Discussion

35.	The nitration of 1,3-Dinitrobenzene forma) 1,3,5 - Trinitrobenzeneb) 1,2,5-Tirnitrobenzenec) 1,3,6 - Trinitrobenzened) No product is formed
Answer» ANSWER: a Explanation:

35.

The nitration of 1,3-Dinitrobenzene forma) 1,3,5 - Trinitrobenzeneb) 1,2,5-Tirnitrobenzenec) 1,3,6 - Trinitrobenzened) No product is formed

Answer»

ANSWER:

a

Explanation:

Discussion

36.	Calculate PH and p o h of 10^-8 M HCL solution
Answer» Explanation: [H+] = 10‐⁸ M As we can SEE, The concentration of H+ is very low. Hence, It is a very DILUTE solution. So, we have to consider Concentration of H+ from H2O also. [H+] of water = 10‐⁷ M Total [H+] = (10‐⁸ + 10‐⁷ ) M ~ 10‐⁷ (APPROX.) pH = -log[H+] = 7 (approx.) pOH = 14 - pH = 14 - 7 = 7 (approx.)

36.

Calculate PH and p o h of 10^-8 M HCL solution

Answer»

Explanation:

[H+] = 10‐⁸ M

As we can SEE,

The concentration of H+ is very low.

Hence, It is a very DILUTE solution.

So, we have to consider Concentration of H+ from H2O also.

[H+] of water = 10‐⁷ M

Total [H+] = (10‐⁸ + 10‐⁷ ) M ~ 10‐⁷ (APPROX.)

pH = -log[H+] = 7 (approx.)

pOH = 14 - pH = 14 - 7 = 7 (approx.)

Discussion

37.	Why I am depressed?
Answer» ANSWER: NIA GLS only /yph-bfmn-tip

37.

Why I am depressed?

Answer»

ANSWER:

NIA GLS only

/yph-bfmn-tip

Discussion

38.	Substance that can be reversibly oxidized or reduced, having different distinct colour in theindividual oxidized and reduced formsa) Redox indicatorsb) Redox potentialc) Redox numberd) Redox state
Answer» ANSWER: WRITE ANGER is REDOX INDICATOR.

38.

Substance that can be reversibly oxidized or reduced, having different distinct colour in theindividual oxidized and reduced formsa) Redox indicatorsb) Redox potentialc) Redox numberd) Redox state

Answer»

ANSWER:

WRITE ANGER is REDOX INDICATOR.

Discussion

39.	when acids and bases are added with water they release H+ and OH- ions respectively but if they are releasing ions then the solution will become unstable.
Answer» what LEVEL is this for?

39.

when acids and bases are added with water they release H+ and OH- ions respectively but if they are releasing ions then the solution will become unstable.

Answer»

what LEVEL is this for?

Discussion

40.	Q. 7 - If an atom contains one electron and one proton, will it carry any charge or not?Q. 8 - On the basis of Rutherford's model of an atom, which subatomic particle is presof an atom ?
Answer» ANSWER: L LAGE padhe he Explanation: l LAG geye

40.

Q. 7 - If an atom contains one electron and one proton, will it carry any charge or not?Q. 8 - On the basis of Rutherford's model of an atom, which subatomic particle is presof an atom ?

Answer»

ANSWER:

L LAGE padhe he

Explanation:

l LAG geye

Discussion

41.	6- What are canal rays?
Answer» Answer: Canal RAYS are the rays of radiation which emerges in a tube which has been DISCHARGED and has the property of low pressure with voltage of high value conditions. EXPLANATION: These canal rays are thus POSITIVE in nature of charge.

41.

6- What are canal rays?

Answer»

Answer:

Canal RAYS are the rays of radiation which emerges in a tube which has been DISCHARGED and has the property of low pressure with voltage of high value conditions. EXPLANATION: These canal rays are thus POSITIVE in nature of charge.

Discussion

42.	2 Acidic buffer solution example isNaOH and HC! 6 N92003 and suphuric acidAcetic acid and sodium acetate NH 40H SNH4C5
Answer» EXPLANATION: A buffer has both a weak acid and its CONJUGATE base (or a weak base and its conjugate acid; to-may-to, to-mah-to) in significant proportions. ... For example, ONE mole of CH3COOH PLUS 0.4 moles NaOH will give 0.4 moles sodium ACETATE and 0.6 moles acetic acid leftover. This is a buffer.

42.

2 Acidic buffer solution example isNaOH and HC! 6 N92003 and suphuric acidAcetic acid and sodium acetate NH 40H SNH4C5

Answer»

EXPLANATION:

A buffer has both a weak acid and its CONJUGATE base (or a weak base and its conjugate acid; to-may-to, to-mah-to) in significant proportions. ... For example, ONE mole of CH3COOH PLUS 0.4 moles NaOH will give 0.4 moles sodium ACETATE and 0.6 moles acetic acid leftover. This is a buffer.

Discussion

43.	What is brotherhood ?aap se kisi ne ni pucha nice h ki ni so mind ur own business
Answer» Answer: BROTHERHOOD is the affection and loyalty that you feel for people with whom you have SOMETHING in common.

43.

What is brotherhood ?aap se kisi ne ni pucha nice h ki ni so mind ur own business

Answer»

Answer:

BROTHERHOOD is the affection and loyalty that you feel for people with whom you have SOMETHING in common.

Discussion

44.	Vii) whichis the most dabundant element foundEarth9a) lithium6) calciumobraniumd) None
Answer» Answer: Oxygen Explanation: Oxygen, which composes about 49.5% of the total mass of the EARTH's CRUST, waters and atmosphere, ACCORDING to the textbook “MODERN Chemistry.” SILICON is second at 28%

44.

Vii) whichis the most dabundant element foundEarth9a) lithium6) calciumobraniumd) None

Answer»

Answer:

Oxygen

Explanation:

Oxygen, which composes about 49.5% of the total mass of the EARTH's CRUST, waters and atmosphere, ACCORDING to the textbook “MODERN Chemistry.” SILICON is second at 28%

Discussion

45.	If we have a 100 grams of carbon how many atoms of carbon do we have?
Answer» ANSWER: There APPROXIMATELY 5 × 10²⁴ CARBON atoms in 100 g of carbon. Explanation: Mark me as branliest and give thanks

45.

If we have a 100 grams of carbon how many atoms of carbon do we have?

Answer»

ANSWER:

There APPROXIMATELY 5 × 10²⁴ CARBON atoms in 100 g of carbon.

Explanation:

Mark me as branliest and give thanks

Discussion

46.	Does hund's rule work on lithium
Answer» Explanation: Hund's RULES basically state that we SOULD maxiumise S and for a GIVEN value of S maximise L. So let us take the case of Li. Li has 3 electrons, clearly the first 2 are in the n=1 state, with S=0 and L=0. For our remaining electron it MUST GO into one of the n=2 states

46.

Does hund's rule work on lithium

Answer»

Explanation:

Hund's RULES basically state that we SOULD maxiumise S and for a GIVEN value of S maximise L. So let us take the case of Li. Li has 3 electrons, clearly the first 2 are in the n=1 state, with S=0 and L=0. For our remaining electron it MUST GO into one of the n=2 states

Discussion

47.	E) CH,CH-CH-CH-CH-CH-CH,, =CH, CH, CH, CHCHCH8
Answer» EXPLANATION: $\Large{\underline{\underline{\sf{\purple{Required\ Answer:-}}}}}$

47.

E) CH,CH-CH-CH-CH-CH-CH,, =CH, CH, CH, CHCHCH8

Answer»

EXPLANATION:

$\Large{\underline{\underline{\sf{\purple{Required\ Answer:-}}}}}$

Discussion

48.	A solution of magnesium chloride has 5 grams of the salt dissolved in 100 grams of water at 70 ºC. Approximately how many more grams of salt can be added to make a saturated solution?
Answer» EXPLANATION: MASS of the SOLUTE=5 g Mass of the solvent=100g Total mass of the SOLUTION = M. of solute + M. of solvent =5 +100 =105 grams thus 105g salt is added.

48.

A solution of magnesium chloride has 5 grams of the salt dissolved in 100 grams of water at 70 ºC. Approximately how many more grams of salt can be added to make a saturated solution?

Answer»

EXPLANATION:

MASS of the SOLUTE=5 g

Mass of the solvent=100g

Total mass of the SOLUTION = M. of solute + M. of solvent

=5 +100

=105 grams

thus 105g salt is added.

Discussion

49.	What is economy? explain briefly
Answer» Answer: MONEY or CAPITAL which we will invest on a particular is KNOWN as economy

49.

What is economy? explain briefly

Answer»

Answer:

MONEY or CAPITAL which we will invest on a particular is KNOWN as economy

Discussion

50.	What are the product of reaction of dilute acid and active metal
Answer» ANSWER: Dilute ACIDS react with relatively reactive metals such as MAGNESIUM, aluminium, zinc and IRON. The products of the reaction are a salt PLUS hydrogen gas.

50.

What are the product of reaction of dilute acid and active metal

Answer»

ANSWER:

Dilute ACIDS react with relatively reactive metals such as MAGNESIUM, aluminium, zinc and IRON. The products of the reaction are a salt PLUS hydrogen gas.

Discussion

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