15280 + Interview Questions in Chemistry Page 4 InterviewSolution

151.	5 A 25 ml sample of 0. 1 M HCI is titrated with 0.1 M NaOH. What is the pH of the solution a the point where 24.9 and 25.1 ml of NaOH have been added? (I) 8.7, 10.7 (3) 3.7, 9.7 (2) 3.7, 5.3 (4) 3.7, 10.3
Answer» 5 A 25 ml sample of 0. 1 M HCI is titrated with 0.1 M NaOH. What is the pH of the solution a the point where 24.9 and 25.1 ml of NaOH have been added? (I) 8.7, 10.7 (3) 3.7, 9.7 (2) 3.7, 5.3 (4) 3.7, 10.3

Discussion

152.	Sulphuric acid is used in ___of metals
Answer» Sulphuric acid is used in ___of metals

Discussion

153.	Do basic solutions also have H+(aq) ions? If yes, then why are these basic?
Answer» Do basic solutions also have $H^{+}$ (aq) ions? If yes, then why are these basic?

Discussion

154.	The sun delivers 105 W/m2 electromagnetic flux to the earth's surface. The total power that is incident on the roof of dimensions (20×20) m2 will be
Answer» The sun delivers $10^{5} {W/m}^{2}$ electromagnetic flux to the earth's surface. The total power that is incident on the roof of dimensions $(20 \times 20) m^{2}$ will be

Discussion

155.	Why we call hemihydrated calcium sulphate as plaster of paris
Answer» Why we call hemihydrated calcium sulphate as plaster of paris

Discussion

156.	Give three applications of electrolysis.
Answer» Give three applications of electrolysis.

Discussion

157.	What are the advantages of (i) soft water (ii) hard water ?
Answer» What are the advantages of (i) soft water (ii) hard water ?

Discussion

158.	If x pentagonal rings and y hexagonal Rings arepresent in fullerene of z carbon atoms then5x+3y=?z1.12.23.34.r
Answer» If x pentagonal rings and y hexagonal Rings are present in fullerene of z carbon atoms then 5x+3y=?z 1.1 2.2 3.3 4.r

Discussion

159.	Apart from silicon dioxide, borosilicate glass contains_______ and __________
Answer» Apart from silicon dioxide, borosilicate glass contains_______ and __________

Discussion

160.	Which of the following statements is correct when SO2 is passed through acidified K2Cr2O7 solution? 1. The solution turns blue 2. The solution is decolourised. 3. SO2 is reduced 4. Green Cr2(SO4)3 is formed
Answer» Which of the following statements is correct when SO2 is passed through acidified K2Cr2O7 solution? 1. The solution turns blue 2. The solution is decolourised. 3. SO2 is reduced 4. Green Cr2(SO4)3 is formed

Discussion

161.	Which of the following metals floats in its reactions with cold water?
Answer» Which of the following metals floats in its reactions with cold water?

Discussion

162.	Two mole of an ideal gas is heated at cons†an t pressure of one atmosphere from 27^0C to 127^0C. If C_{v,m}=20+10^{-2} TJK^{-1}mol^{-1}, then q and Δ Ufor the process are respectively: (1) 6362.8J, 4700J (2) 3037.2J,4700J (3) 7062.8J ,5400J (4) 3181.4J , 2350J
Answer» Two mole of an ideal gas is heated at cons†an t pressure of one atmosphere from 27^0C to 127^0C. If C_{v,m}=20+10^{-2} TJK^{-1}mol^{-1}, then q and Δ Ufor the process are respectively: (1) 6362.8J, 4700J (2) 3037.2J,4700J (3) 7062.8J ,5400J (4) 3181.4J , 2350J

Discussion

163.	The pH value of pure water (H2O) is 7. What do you understand by this?
Answer» The pH value of pure water (H₂O) is 7. What do you understand by this?

Discussion

164.	Question 14Differentiate between metal and non-metal on the basis of their chemical properties.
Answer» Question 14 Differentiate between metal and non-metal on the basis of their chemical properties.

Discussion

165.	Which of the following statements are true regarding the oxygen atom?
Answer» Which of the following statements are true regarding the oxygen atom?

Discussion

166.	How will you test for the gas which is liberated when hydrochloric acid reacts with an active metal?
Answer» How will you test for the gas which is liberated when hydrochloric acid reacts with an active metal?

Discussion

167.	how to calculate the valence shell electrons?
Answer» how to calculate the valence shell electrons?

Discussion

168.	What are acids? [1 MARK]
Answer» What are acids? [1 MARK]

Discussion

169.	For the reaction N2+3H2 2NH3, the rate of9.change of concentration for hydrogen is-0.3 10-4 Ms-1 The rate of change ofconcentration of ammonia is(2) 0.2x 104 Ms-1(1) -0.2 104 Ms-1(4) 0.3x 104 Ms-1(3) 0.110-4 Ms-1
Answer» For the reaction N2+3H2 2NH3, the rate of9.change of concentration for hydrogen is-0.3 10-4 Ms-1 The rate of change ofconcentration of ammonia is(2) 0.2x 104 Ms-1(1) -0.2 104 Ms-1(4) 0.3x 104 Ms-1(3) 0.110-4 Ms-1

Discussion

170.	ntFor the estimation of Nitrogen, 7g of an organic compound was digested by kjeldahl's method and the evolved ammonia was absorbed in 100ml of M/10 sulphuric acid. The unreacted acid required 50ml of M/10 sodium hydroxide for complete neutralization. The percentage of Nitrogen in the compound isn ntA. 6%n ntB. 10%n ntC. 3%n ntD. 5%n
Answer» ntFor the estimation of Nitrogen, 7g of an organic compound was digested by kjeldahl's method and the evolved ammonia was absorbed in 100ml of M/10 sulphuric acid. The unreacted acid required 50ml of M/10 sodium hydroxide for complete neutralization. The percentage of Nitrogen in the compound isn ntA. 6%n ntB. 10%n ntC. 3%n ntD. 5%n

Discussion

171.	(a) Define corrosion. What name is given to the corrosion of iron ? (b) Name the colour of coating formed on silver and copper articles, when exposed to air ? (c) List two damages caused by corrosion and suggest how corrosion can be prevented.
Answer» (a) Define corrosion. What name is given to the corrosion of iron ? (b) Name the colour of coating formed on silver and copper articles, when exposed to air ? (c) List two damages caused by corrosion and suggest how corrosion can be prevented.

Discussion

172.	Which of the following series is arranged in order of increasing ionic radius ?
Answer» Which of the following series is arranged in order of increasing ionic radius ?

Discussion

173.	Which of these is correct about properties of pure sulphuric acid?
Answer» Which of these is correct about properties of pure sulphuric acid?

Discussion

174.	Define valency.
Answer» Define valency.

Discussion

175.	H+ ions released by acids combine with water to form ______ ions.
Answer» $H^{+}$ ions released by acids combine with water to form ______ ions.

Discussion

176.	Hydrogen chloride solution in water turns blue litmus red, and conducts electricity, while in toluene does not. Explain why.
Answer» Hydrogen chloride solution in water turns blue litmus red, and conducts electricity, while in toluene does not. Explain why.

Discussion

177.	Cracking of ethane gives a mixture of .
Answer» Cracking of ethane gives a mixture of .

Discussion

178.	The metals which can produce amphoteric oxides are: (a) Sodium and aluminium (b) zinc and potassium (c) calcium and sodium (d) aluminium and zinc
Answer» The metals which can produce amphoteric oxides are: (a) Sodium and aluminium (b) zinc and potassium (c) calcium and sodium (d) aluminium and zinc

Discussion

179.	Is metals attract cathode electrode?
Answer» Is metals attract cathode electrode?

Discussion

180.	Assertion: Plastic bags are not turned into harmless substances in soil and water. Reason: Soil microflora lack bio-catalysts for rendering plastics harmless.
Answer» Assertion: Plastic bags are not turned into harmless substances in soil and water. Reason: Soil microflora lack bio-catalysts for rendering plastics harmless.

180.

Assertion: Plastic bags are not turned into harmless substances in soil and water. Reason: Soil microflora lack bio-catalysts for rendering plastics harmless.

Answer»

Assertion: Plastic bags are not turned into harmless substances in soil and water.

Reason: Soil microflora lack bio-catalysts for rendering plastics harmless.

Discussion

181.	Name the element whose allotropic form is graphite.
Answer» Name the element whose allotropic form is graphite.

Discussion

182.	What is meant by crystal form?
Answer» What is meant by crystal form?

Discussion

183.	Compare and contrast the arrangement of elements in Mendeleev's periodic Table and the Modern Periodic Table. [5 MARKS]
Answer» Compare and contrast the arrangement of elements in Mendeleev's periodic Table and the Modern Periodic Table. [5 MARKS]

Discussion

184.	Name the products formed when ZnSO4 solution is added to NaOH solution.
Answer» Name the products formed when $Z n S O_{4}$ solution is added to NaOH solution.

Discussion

185.	Ethanol is:
Answer» Ethanol is:

Discussion

186.	Copper can be displaced by:
Answer» Copper can be displaced by:

Discussion

187.	A container is placed on a table has four holes. The XA,XB,XCand XD represent the horizontal distances covered by the liquid coming out from the holes A,B,C, and D respectively. Which of the following options is correct?
Answer» A container is placed on a table has four holes. The $X_{A}, X_{B}, X_{C}$ and $X_{D}$ represent the horizontal distances covered by the liquid coming out from the holes $A, B, C,$ and $D$ respectively. Which of the following options is correct?

187.

A container is placed on a table has four holes. The XA,XB,XCand XD represent the horizontal distances covered by the liquid coming out from the holes A,B,C, and D respectively. Which of the following options is correct?

Answer»

A container is placed on a table has four holes. The $X_{A}, X_{B}, X_{C}$ and $X_{D}$ represent the horizontal distances covered by the liquid coming out from the holes $A, B, C,$ and $D$ respectively. Which of the following options is correct?

Discussion

188.	If light of wavelength λ_1 is allowed to fall on a metal, then kinetic energy of photoelectrons emitted is E_1. If wavelength of light changes to λ_2 then kinetic energy of electron changes to E_2. Then work function of metal is :-
Answer» If light of wavelength λ_1 is allowed to fall on a metal, then kinetic energy of photoelectrons emitted is E_1. If wavelength of light changes to λ_2 then kinetic energy of electron changes to E_2. Then work function of metal is :-

Discussion

189.	Critical temperature of N2, CO and CH4 are 126, 134 and 190 K respectivley. The increasing order of adsorption on the surface of activated charcoal is:
Answer» Critical temperature of $N_{2}, C O$ and $C H_{4}$ are $126, 134 and 190 K$ respectivley. The increasing order of adsorption on the surface of activated charcoal is:

Discussion

190.	first ionisation potential is given then how to calculate first elecron gain enthalpy
Answer» first ionisation potential is given then how to calculate first elecron gain enthalpy

Discussion

191.	raintreecoatshipfieldplay
Answer» rain tree coat ship field play

Discussion

192.	Question 9 (b)What happens when:Iron nails are placed in copper sulphate solution?Write word equations of the reactions involved.
Answer» Question 9 (b) What happens when: Iron nails are placed in copper sulphate solution? Write word equations of the reactions involved.

Discussion

193.	Mark ‘T’ if the statement is true and ‘F’ if it is false(i) Nitric acid turn red litmus blue. (T/F)(ii) Sodium hydroxide turns blue litmus red. (T/F)(iii) Sodium hydroxide and hydrochloric acid neutralize each other and form salt and water. (T/F)(iv) Indicator is a substance which shows different colours in acidic and basic solutions. (T/F)(v) Tooth decay is caused by the presence of a base. (T/F)
Answer» Mark ‘T’ if the statement is true and ‘F’ if it is false (i) Nitric acid turn red litmus blue. (T/F) (ii) Sodium hydroxide turns blue litmus red. (T/F) (iii) Sodium hydroxide and hydrochloric acid neutralize each other and form salt and water. (T/F) (iv) Indicator is a substance which shows different colours in acidic and basic solutions. (T/F) (v) Tooth decay is caused by the presence of a base. (T/F)

193.

Mark ‘T’ if the statement is true and ‘F’ if it is false(i) Nitric acid turn red litmus blue. (T/F)(ii) Sodium hydroxide turns blue litmus red. (T/F)(iii) Sodium hydroxide and hydrochloric acid neutralize each other and form salt and water. (T/F)(iv) Indicator is a substance which shows different colours in acidic and basic solutions. (T/F)(v) Tooth decay is caused by the presence of a base. (T/F)

Answer»

Mark ‘T’ if the statement is true and ‘F’ if it is false

(i) Nitric acid turn red litmus blue. (T/F)

(ii) Sodium hydroxide turns blue litmus red. (T/F)

(iii) Sodium hydroxide and hydrochloric acid neutralize each other and form salt and water. (T/F)

(iv) Indicator is a substance which shows different colours in acidic and basic solutions. (T/F)

(v) Tooth decay is caused by the presence of a base. (T/F)

Discussion

194.	Is Mole/Stoichiometric coefficientAny formula of No. of gram equivalence 4 Al + 3 Oxygen ----------- 2 Aluminium oxide Therefore, moles of Al / 4 = Moles of oxygen / 3 [For no. of gram equivalence]
Answer» Is Mole/Stoichiometric coefficient Any formula of No. of gram equivalence 4 Al + 3 Oxygen ----------- 2 Aluminium oxide Therefore, moles of Al / 4 = Moles of oxygen / 3 [For no. of gram equivalence]

Discussion

195.	There are three cubic unit cells A,B and C. A is FCC and all of its tetrahedral voids are also occupied. B is also FCC and all of its octahedral voids are also occupied. C is simple cubic and all of its cubic voids are also occupied. If voids in all unit cells are occupied by the spheres exactly at their limiting radius, the order of packing efficiency would be:
Answer» There are three cubic unit cells $A, B$ and $C$ . $A$ is $F C C$ and all of its tetrahedral voids are also occupied. $B$ is also $F C C$ and all of its octahedral voids are also occupied. $C$ is simple cubic and all of its cubic voids are also occupied. If voids in all unit cells are occupied by the spheres exactly at their limiting radius, the order of packing efficiency would be:

Discussion

196.	What are linear polymers? State its 2 examples.
Answer» What are linear polymers? State its 2 examples.

Discussion

197.	leching of ore is done by? plese give explanation as to why serpeck's method is not chosen.a)hall's processb)serpeck's processc)cyanide processd)hall-heroult's process
Answer» leching of ore is done by? plese give explanation as to why serpeck's method is not chosen. a)hall's process b)serpeck's process c)cyanide process d)hall-heroult's process

Discussion

198.	Explain the properties of alloys are different from those of constituent metals
Answer» Explain the properties of alloys are different from those of constituent metals

Discussion

199.	Explain periodic law given by mendeleev in detail
Answer» Explain periodic law given by mendeleev in detail

Discussion

200.	A Metal 'm' crystallizes in fcc & bcc structure depending upon the temperature .The ratio of its densities in fcc&bcc would be
Answer» A Metal 'm' crystallizes in fcc & bcc structure depending upon the temperature .The ratio of its densities in fcc&bcc would be

Discussion

Explore topic-wise InterviewSolutions in .

5 A 25 ml sample of 0. 1 M HCI is titrated with 0.1 M NaOH. What is the pH of the solution a the point where 24.9 and 25.1 ml of NaOH have been added? (I) 8.7, 10.7 (3) 3.7, 9.7 (2) 3.7, 5.3 (4) 3.7, 10.3

Sulphuric acid is used in ___of metals

Do basic solutions also have H+(aq) ions? If yes, then why are these basic?

The sun delivers 105 W/m2 electromagnetic flux to the earth's surface. The total power that is incident on the roof of dimensions (20×20) m2 will be

Why we call hemihydrated calcium sulphate as plaster of paris

Give three applications of electrolysis.

What are the advantages of (i) soft water (ii) hard water ?

If x pentagonal rings and y hexagonal Rings arepresent in fullerene of z carbon atoms then5x+3y=?z1.12.23.34.r

Apart from silicon dioxide, borosilicate glass contains_______ and __________

Which of the following statements is correct when SO2 is passed through acidified K2Cr2O7 solution? 1. The solution turns blue 2. The solution is decolourised. 3. SO2 is reduced 4. Green Cr2(SO4)3 is formed

Which of the following metals floats in its reactions with cold water?

Two mole of an ideal gas is heated at cons†an t pressure of one atmosphere from 27^0C to 127^0C. If C_{v,m}=20+10^{-2} TJK^{-1}mol^{-1}, then q and Δ Ufor the process are respectively: (1) 6362.8J, 4700J (2) 3037.2J,4700J (3) 7062.8J ,5400J (4) 3181.4J , 2350J

The pH value of pure water (H2O) is 7. What do you understand by this?

Question 14Differentiate between metal and non-metal on the basis of their chemical properties.

Which of the following statements are true regarding the oxygen atom?

How will you test for the gas which is liberated when hydrochloric acid reacts with an active metal?

how to calculate the valence shell electrons?

What are acids? [1 MARK]

For the reaction N2+3H2 2NH3, the rate of9.change of concentration for hydrogen is-0.3 10-4 Ms-1 The rate of change ofconcentration of ammonia is(2) 0.2x 104 Ms-1(1) -0.2 104 Ms-1(4) 0.3x 104 Ms-1(3) 0.110-4 Ms-1

(a) Define corrosion. What name is given to the corrosion of iron ? (b) Name the colour of coating formed on silver and copper articles, when exposed to air ? (c) List two damages caused by corrosion and suggest how corrosion can be prevented.

Which of the following series is arranged in order of increasing ionic radius ?

Which of these is correct about properties of pure sulphuric acid?

Define valency.

H+ ions released by acids combine with water to form ______ ions.

Hydrogen chloride solution in water turns blue litmus red, and conducts electricity, while in toluene does not. Explain why.

Cracking of ethane gives a mixture of .

The metals which can produce amphoteric oxides are: (a) Sodium and aluminium (b) zinc and potassium (c) calcium and sodium (d) aluminium and zinc

Is metals attract cathode electrode?

Assertion: Plastic bags are not turned into harmless substances in soil and water. Reason: Soil microflora lack bio-catalysts for rendering plastics harmless.

Name the element whose allotropic form is graphite.

What is meant by crystal form?

Compare and contrast the arrangement of elements in Mendeleev's periodic Table and the Modern Periodic Table. [5 MARKS]

Name the products formed when ZnSO4 solution is added to NaOH solution.

Ethanol is:

Copper can be displaced by:

A container is placed on a table has four holes. The XA,XB,XCand XD represent the horizontal distances covered by the liquid coming out from the holes A,B,C, and D respectively. Which of the following options is correct?

If light of wavelength λ_1 is allowed to fall on a metal, then kinetic energy of photoelectrons emitted is E_1. If wavelength of light changes to λ_2 then kinetic energy of electron changes to E_2. Then work function of metal is :-

Critical temperature of N2, CO and CH4 are 126, 134 and 190 K respectivley. The increasing order of adsorption on the surface of activated charcoal is:

first ionisation potential is given then how to calculate first elecron gain enthalpy

raintreecoatshipfieldplay

Question 9 (b)What happens when:Iron nails are placed in copper sulphate solution?Write word equations of the reactions involved.

Is Mole/Stoichiometric coefficientAny formula of No. of gram equivalence 4 Al + 3 Oxygen ----------- 2 Aluminium oxide Therefore, moles of Al / 4 = Moles of oxygen / 3 [For no. of gram equivalence]

What are linear polymers? State its 2 examples.

leching of ore is done by? plese give explanation as to why serpeck's method is not chosen.a)hall's processb)serpeck's processc)cyanide processd)hall-heroult's process

Explain the properties of alloys are different from those of constituent metals

Explain periodic law given by mendeleev in detail

A Metal 'm' crystallizes in fcc & bcc structure depending upon the temperature .The ratio of its densities in fcc&bcc would be

Apart from silicon dioxide, borosilicate glass contains_ and ____