15280 + Interview Questions in Chemistry Page 1 InterviewSolution

1.	The dipole moment of KCl is 3.336×10−29 Coulomb meters which indicates that it is a highly polar molecule. The interionic distance between K+ and Cl− in this molecule is 2.6×10−10 m. The percentage ionic character of KCl molecule, if there were opposite charges of one fundamental unit located at each nucleus is:
Answer» The dipole moment of $K C l$ is $3.336 \times 10^{- 29} C o u l o m b m e t e r s$ which indicates that it is a highly polar molecule. The interionic distance between $K^{+}$ and $C l^{-}$ in this molecule is $2.6 \times 10^{- 10} m$ . The percentage ionic character of $K C l$ molecule, if there were opposite charges of one fundamental unit located at each nucleus is:

Discussion

2.	on heating with concentrated sulphuric acid, sucrose givesOption:a) CO and CO2b) C, CO2 and SO2c) CO, CO2 and SO2d) C and H2Oe) CO2, SO2 and H2O
Answer» on heating with concentrated sulphuric acid, sucrose gives Option: a) CO and CO2 b) C, CO2 and SO2 c) CO, CO2 and SO2 d) C and H2O e) CO2, SO2 and H2O

Discussion

3.	Why CH2Cl2 is Polar molecular solid
Answer» Why CH2Cl2 is Polar molecular solid

Discussion

4.	Which among the following is/are ore/ores of iron?
Answer» Which among the following is/are ore/ores of iron?

Discussion

5.	how many spectral lines r seen for hydrogen atom when e jumps from n2= 5 to n1=1 in visible region
Answer» how many spectral lines r seen for hydrogen atom when e jumps from n2= 5 to n1=1 in visible region

Discussion

6.	Explain, why electrolysis is an example of redox reaction?
Answer» Explain, why electrolysis is an example of redox reaction?

Discussion

7.	A solution of CuSO4 was kept in an iron pot. After a few days, the iron pot was found to have a number of holes in it. Explain the reason in terms of reactivity. Write the equation of the reaction involved.
Answer» A solution of ${CuSO}_{4}$ was kept in an iron pot. After a few days, the iron pot was found to have a number of holes in it. Explain the reason in terms of reactivity. Write the equation of the reaction involved.

Discussion

8.	Which element from the following has the highest ionisation energy ? (a) P, Na, Cl (b) F, O, Ne (c) Ne, He, Ar Explain your choice.
Answer» Which element from the following has the highest ionisation energy ? (a) P, Na, Cl (b) F, O, Ne (c) Ne, He, Ar Explain your choice.

8.

Which element from the following has the highest ionisation energy ? (a) P, Na, Cl (b) F, O, Ne (c) Ne, He, Ar Explain your choice.

Answer»

Which element from the following has the highest ionisation energy ?

(a) P, Na, Cl (b) F, O, Ne (c) Ne, He, Ar

Explain your choice.

Discussion

9.	How many groups and periods are there in the modern periodic table?
Answer» How many groups and periods are there in the modern periodic table?

Discussion

10.	Under what conditions does ethane get converted to(a) ethyl alcohol(b) acetic acid
Answer» Under what conditions does ethane get converted to (a) ethyl alcohol (b) acetic acid

Discussion

11.	What are hydrocarbons? Compare saturated and unsaturated hydrocarbons. [4 MARKS]
Answer» What are hydrocarbons? Compare saturated and unsaturated hydrocarbons. [4 MARKS]

Discussion

12.	What is homologous series? Give examples. What are the characteristics of homologous series?
Answer» What is homologous series? Give examples. What are the characteristics of homologous series?

Discussion

13.	Select the substance which shows acidic behavior in its aqueous solution.
Answer» Select the substance which shows acidic behavior in its aqueous solution.

Discussion

14.	A pale green compound X reacts with caustic soda to form dirty green gelatinous precipitate along with sodium sulphate. Name this precipitate.
Answer» A pale green compound X reacts with caustic soda to form dirty green gelatinous precipitate along with sodium sulphate. Name this precipitate.

Discussion

15.	The ability of carbon atom to link with another carbon atom and thus form long chains is known as __.
Answer» The ability of carbon atom to link with another carbon atom and thus form long chains is known as __.

Discussion

16.	A gas has a density of 2.68g/ L at stp. Identify it (A) NO2 (B) Kr (C) COS (D) SO
Answer» A gas has a density of 2.68g/ L at stp. Identify it (A) NO2 (B) Kr (C) COS (D) SO

Discussion

17.	Alcl3 is Lewis acid
Answer» Alcl3 is Lewis acid

Discussion

18.	IUPAC name of the following compound is CH3−CH=CH−C≡?
Answer» IUPAC name of the following compound is $C H_{3} - C H = C H - C \equiv$ ?

Discussion

19.	32. Write balanced chemical equations of (i) Solutions of barium chloride and sodium sulphate in water react to give insoluble barium sulphate and the solution of sodium chloride. (ii) sodium hydroxide solution ( in water) reacts with hydrochloric acid solution (in water) to produce sodium chloride solution and water.
Answer» 32. Write balanced chemical equations of (i) Solutions of barium chloride and sodium sulphate in water react to give insoluble barium sulphate and the solution of sodium chloride. (ii) sodium hydroxide solution ( in water) reacts with hydrochloric acid solution (in water) to produce sodium chloride solution and water.

Discussion

20.	HCl acid is
Answer» $H C l$ acid is

Discussion

21.	16. Why H2CO3 is considered as weak acid even though its basicity is 2?
Answer» 16. Why H2CO3 is considered as weak acid even though its basicity is 2?

Discussion

22.	Complete and balance the following reactions: [4 MARKS] (a) KCl+H2SO4(conc.)→ (b) Cu+HCl(dil.)→ (c) CuO+HCl(dil.)→ (d) CuO+[O]HCl(conc.)→
Answer» Complete and balance the following reactions: [4 MARKS] (a) $K C l + H_{2} S O_{4} (c o n c .) \to$ (b) $C u + H C l (d i l .) \to$ (c) $C u O + H C l (d i l .) \to$ (d) $C u O + [O] H C l (c o n c .) \to$

Discussion

23.	The subshell 4s has the smaller energy than the subshell 3d.But the subshell configuration of Cr is 1s2 2s2 2p6 3s2 3p6 3d5 4s1.why did 3d came 1st and 4s after it ???
Answer» The subshell 4s has the smaller energy than the subshell 3d.But the subshell configuration of Cr is 1s² 2s²2p⁶3s²3p⁶ 3d⁵4s¹.why did 3d came 1^stand 4s after it ???

Discussion

24.	Give reason why carbonate and sulphide ores are usually converted into oxides during the process of extraction?
Answer» Give reason why carbonate and sulphide ores are usually converted into oxides during the process of extraction?

Discussion

25.	Which is more basic in nature, magnesium or aluminium?
Answer» Which is more basic in nature, magnesium or aluminium?

Discussion

26.	Metals, non-metals and metalloids are all present in
Answer» Metals, non-metals and metalloids are all present in

Discussion

27.	17. IUPAC name for [CO(H2O)2(NH3)4]Cle
Answer» 17. IUPAC name for [CO(H2O)2(NH3)4]Cle

Discussion

28.	Give three equations of the reactions to prove that nitric acid is an acid.
Answer» Give three equations of the reactions to prove that nitric acid is an acid.

Discussion

29.	19. Assertion:Sb(III) is not precipitated as sulphide when in its alkaline solution H2S is passed. Reason: the concentration of S2- ion in alkaline medium is inadequate for precipitation.
Answer» 19. Assertion:Sb(III) is not precipitated as sulphide when in its alkaline solution H2S is passed. Reason: the concentration of S2- ion in alkaline medium is inadequate for precipitation.

Discussion

30.	(a) What is combustion?(b) Two glass jars A and B are filled with carbon dioxide and oxygen gases respectively. In each jar, a lighted candle is placed simultaneously. In which jar, will the candle remain lighted for a longer time and why?
Answer» (a) What is combustion? (b) Two glass jars A and B are filled with carbon dioxide and oxygen gases respectively. In each jar, a lighted candle is placed simultaneously. In which jar, will the candle remain lighted for a longer time and why?

30.

(a) What is combustion?(b) Two glass jars A and B are filled with carbon dioxide and oxygen gases respectively. In each jar, a lighted candle is placed simultaneously. In which jar, will the candle remain lighted for a longer time and why?

Answer»

(a) What is combustion?

(b) Two glass jars A and B are filled with carbon dioxide and oxygen gases respectively. In each jar, a lighted candle is placed simultaneously. In which jar, will the candle remain lighted for a longer time and why?

Discussion

31.	What mass in kg of K2O contains the same number of moles of K atoms as a present in 1 kg of KCl?
Answer» What mass in kg of K₂O contains the same number of moles of K atoms as a present in 1 kg of KCl?

Discussion

32.	A certain amount of a metal whose equivalent massis 28 displaces 0.7 L of H, at S.T.P. from an acidhence máss of the element is12
Answer» A certain amount of a metal whose equivalent massis 28 displaces 0.7 L of H, at S.T.P. from an acidhence máss of the element is12

Discussion

33.	what is malic acid?
Answer» what is malic acid?

Discussion

34.	Soil salinity is measured by
Answer» Soil salinity is measured by

Discussion

35.	50.0kg of Nitrogen(g) and 10.0kg of Hydrogen (g) are mixed to produce NH3 (g) /(Ammonia). Calculate the moles of Ammonia gas formed. Identify the limiting reagent in the production of NH3 in this situation
Answer» 50.0kg of Nitrogen(g) and 10.0kg of Hydrogen (g) are mixed to produce NH3 (g) /(Ammonia). Calculate the moles of Ammonia gas formed. Identify the limiting reagent in the production of NH3 in this situation

Discussion

36.	Question 1 (b)Blue green algae fix ___ directly from air to enhance fertility of soil.
Answer» Question 1 (b) Blue green algae fix ___ directly from air to enhance fertility of soil.

Discussion

37.	What is meant by pH?
Answer» What is meant by pH?

Discussion

38.	Number of C–H and C–C single bonds respectively in structure given below are-
Answer» Number of C–H and C–C single bonds respectively in structure given below are-

38.

Number of C–H and C–C single bonds respectively in structure given below are-

Answer»

Number of C–H and C–C single bonds respectively in structure given below are-

Discussion

39.	31.equal volume of n2 and h2 react to form ammonia under suitable conditions then what is the limiting reagent?
Answer» 31.equal volume of n2 and h2 react to form ammonia under suitable conditions then what is the limiting reagent?

Discussion

40.	44. Aluminum is a reactive metal but still it is used for packing food articles. Why
Answer» 44. Aluminum is a reactive metal but still it is used for packing food articles. Why

Discussion

41.	Explain the process by which the metal is obtained from its molten chloride
Answer» Explain the process by which the metal is obtained from its molten chloride

Discussion

42.	An organic compound with vapour density = 94 contains C = 12.67%, H = 2.13%, and Br = 85.11%. Find the molecular formula.[Atomic mass: C = 12, H = 1, Br = 80]
Answer» An organic compound with vapour density = 94 contains C = 12.67%, H = 2.13%, and Br = 85.11%. Find the molecular formula. [Atomic mass: C = 12, H = 1, Br = 80]

Discussion

43.	Equal volumes of 0.2M NH4OH and 0.1M H2SO4 are mixed. Calculate the pH of final solution.
Answer» Equal volumes of 0.2M NH4OH and 0.1M H2SO4 are mixed. Calculate the pH of final solution.

Discussion

44.

Metallic oxides of zinc, magnesium and copper were heated with the following metals. Metal Zinc Magnesium Copper Zinc oxide - - - Magnesium oxide - - - Copper oxide - - - In which cases will you find displacement reactions taking place?

Answer»

Metallic oxides of zinc, magnesium and copper were heated with the following metals.

Metal	Zinc	Magnesium	Copper
Zinc oxide	-	-	-
Magnesium oxide	-	-	-
Copper oxide	-	-	-

In which cases will you find displacement reactions taking place?

Discussion

45.	Why is mercury solid?
Answer» Why is mercury solid?

Discussion

46.	(a) What are amphoteric oxides? Give two examples of amphoteric oxides. (b) Choose the acidic oxides, basic oxides and neutral oxides from the following: Na2O:CO2;CO;SO2;MgO;N2O;H2O. (c) Which of the following are amphoteric oxides: MgO,ZnO,P2O3,Al2O3,NO2
Answer» (a) What are amphoteric oxides? Give two examples of amphoteric oxides. (b) Choose the acidic oxides, basic oxides and neutral oxides from the following: $N a_{2} O : C O_{2}; C O; S O_{2}; M g O; N_{2} O; H_{2} O .$ (c) Which of the following are amphoteric oxides: $M g O, Z n O, P_{2} O_{3}, A l_{2} O_{3}, N O_{2}$

Discussion

47.	corrosion damages
Answer» corrosion damages

Discussion

48.	Which of the following organic acid is present in the sting of ants and bees?
Answer» Which of the following organic acid is present in the sting of ants and bees?

Discussion

49.	Calculate molecular formula & empirical formula of compund having carbon 80% and oxygen 20.20% ,and molecular mass of compond is 30u.
Answer» Calculate molecular formula & empirical formula of compund having carbon 80% and oxygen 20.20% ,and molecular mass of compond is 30u.

Discussion

50.	What is formed when metals are blended with other metals?
Answer» What is formed when metals are blended with other metals?

Discussion

Explore topic-wise InterviewSolutions in .

on heating with concentrated sulphuric acid, sucrose givesOption:a) CO and CO2b) C, CO2 and SO2c) CO, CO2 and SO2d) C and H2Oe) CO2, SO2 and H2O

Why CH2Cl2 is Polar molecular solid

Which among the following is/are ore/ores of iron?

how many spectral lines r seen for hydrogen atom when e jumps from n2= 5 to n1=1 in visible region

Explain, why electrolysis is an example of redox reaction?

A solution of CuSO4 was kept in an iron pot. After a few days, the iron pot was found to have a number of holes in it. Explain the reason in terms of reactivity. Write the equation of the reaction involved.

Which element from the following has the highest ionisation energy ? (a) P, Na, Cl (b) F, O, Ne (c) Ne, He, Ar Explain your choice.

How many groups and periods are there in the modern periodic table?

Under what conditions does ethane get converted to(a) ethyl alcohol(b) acetic acid

What are hydrocarbons? Compare saturated and unsaturated hydrocarbons. [4 MARKS]

What is homologous series? Give examples. What are the characteristics of homologous series?

Select the substance which shows acidic behavior in its aqueous solution.

A pale green compound X reacts with caustic soda to form dirty green gelatinous precipitate along with sodium sulphate. Name this precipitate.

The ability of carbon atom to link with another carbon atom and thus form long chains is known as __.

A gas has a density of 2.68g/ L at stp. Identify it (A) NO2 (B) Kr (C) COS (D) SO

Alcl3 is Lewis acid

IUPAC name of the following compound is CH3−CH=CH−C≡?

HCl acid is

16. Why H2CO3 is considered as weak acid even though its basicity is 2?

Complete and balance the following reactions: [4 MARKS] (a) KCl+H2SO4(conc.)→ (b) Cu+HCl(dil.)→ (c) CuO+HCl(dil.)→ (d) CuO+[O]HCl(conc.)→

The subshell 4s has the smaller energy than the subshell 3d.But the subshell configuration of Cr is 1s2 2s2 2p6 3s2 3p6 3d5 4s1.why did 3d came 1st and 4s after it ???

Give reason why carbonate and sulphide ores are usually converted into oxides during the process of extraction?

Which is more basic in nature, magnesium or aluminium?

Metals, non-metals and metalloids are all present in

17. IUPAC name for [CO(H2O)2(NH3)4]Cle

Give three equations of the reactions to prove that nitric acid is an acid.

19. Assertion:Sb(III) is not precipitated as sulphide when in its alkaline solution H2S is passed. Reason: the concentration of S2- ion in alkaline medium is inadequate for precipitation.

(a) What is combustion?(b) Two glass jars A and B are filled with carbon dioxide and oxygen gases respectively. In each jar, a lighted candle is placed simultaneously. In which jar, will the candle remain lighted for a longer time and why?

What mass in kg of K​​​​​​2​​​​​O contains the same number of moles of K atoms as a present in 1 kg of KCl?

A certain amount of a metal whose equivalent massis 28 displaces 0.7 L of H, at S.T.P. from an acidhence máss of the element is12

what is malic acid?

Soil salinity is measured by

50.0kg of Nitrogen(g) and 10.0kg of Hydrogen (g) are mixed to produce NH3 (g) /(Ammonia). Calculate the moles of Ammonia gas formed. Identify the limiting reagent in the production of NH3 in this situation

Question 1 (b)Blue green algae fix ___ directly from air to enhance fertility of soil.

What is meant by pH?

Number of C–H and C–C single bonds respectively in structure given below are-

31.equal volume of n2 and h2 react to form ammonia under suitable conditions then what is the limiting reagent?

44. Aluminum is a reactive metal but still it is used for packing food articles. Why

Explain the process by which the metal is obtained from its molten chloride

An organic compound with vapour density = 94 contains C = 12.67%, H = 2.13%, and Br = 85.11%. Find the molecular formula.[Atomic mass: C = 12, H = 1, Br = 80]

Equal volumes of 0.2M NH4OH and 0.1M H2SO4 are mixed. Calculate the pH of final solution.

Metallic oxides of zinc, magnesium and copper were heated with the following metals. Metal Zinc Magnesium Copper Zinc oxide - - - Magnesium oxide - - - Copper oxide - - - In which cases will you find displacement reactions taking place?

Why is mercury solid?

(a) What are amphoteric oxides? Give two examples of amphoteric oxides. (b) Choose the acidic oxides, basic oxides and neutral oxides from the following: Na2O:CO2;CO;SO2;MgO;N2O;H2O. (c) Which of the following are amphoteric oxides: MgO,ZnO,P2O3,Al2O3,NO2

corrosion damages

Which of the following organic acid is present in the sting of ants and bees?

Calculate molecular formula & empirical formula of compund having carbon 80% and oxygen 20.20% ,and molecular mass of compond is 30u.

What is formed when metals are blended with other metals?

What mass in kg of K2O contains the same number of moles of K atoms as a present in 1 kg of KCl?