15280 + Interview Questions in Chemistry

1.	The chemical formula of the ionic compound containing Fe3+ and (SO4)2−is____.
Answer» The chemical formula of the ionic compound containing ${F e}^{3 +}$ and $(S O_{4})^{2 -}$ is____.

Discussion

2.	Which one of the elements has the maximum electron affinity ?
Answer» Which one of the elements has the maximum electron affinity ?

Discussion

3.	Name the given structure: CH3 - CH - CH = CH2 . I . CH2 . I . CHO
Answer» Name the given structure: CH3 - CH - CH = CH2 . I . CH2 . I . CHO

Discussion

4.	Which is the most electro positive element?
Answer» Which is the most electro positive element?

Discussion

5.	How to find the position of the elements in the modern periodic table
Answer» How to find the position of the elements in the modern periodic table

Discussion

6.	The solid element A exhibits the property of catenation. It is also present in the form of a gas B in the air which is utilised by plants in photosynthesis. An allotrope C of this element is used in glass cutters. (a) What is element A? (b) What is the gas B? (c) Name the allotrope C. (d) State another use of allotrope C (other than in glass cutters) (e) Name another allotrope of element A which exists as spherical molecules. (f) Name a yet another allotrope of element A which conducts electricity.
Answer» The solid element A exhibits the property of catenation. It is also present in the form of a gas B in the air which is utilised by plants in photosynthesis. An allotrope C of this element is used in glass cutters. (a) What is element A? (b) What is the gas B? (c) Name the allotrope C. (d) State another use of allotrope C (other than in glass cutters) (e) Name another allotrope of element A which exists as spherical molecules. (f) Name a yet another allotrope of element A which conducts electricity.

Discussion

7.	A white precipitate will be formed if we add common salt solution to : (a) Ba(NO3)2 solution (b) KNO3 solution (c) AgNO3 solution (d) Mg(NO3)2 solution
Answer» A white precipitate will be formed if we add common salt solution to : (a) $B a (N O_{3})_{2}$ solution (b) $K N O_{3}$ solution (c) $A g N O_{3}$ solution (d) $M g (N O_{3})_{2}$ solution

7.

A white precipitate will be formed if we add common salt solution to : (a) Ba(NO3)2 solution (b) KNO3 solution (c) AgNO3 solution (d) Mg(NO3)2 solution

Answer»

A white precipitate will be formed if we add common salt solution to :

(a) $B a (N O_{3})_{2}$ solution (b) $K N O_{3}$ solution (c) $A g N O_{3}$ solution (d) $M g (N O_{3})_{2}$ solution

Discussion

8.	What happens when calcium nitrate reacts with ammonium hydroxide?
Answer» What happens when calcium nitrate reacts with ammonium hydroxide?

Discussion

9.	What will be the atomicity of: a) The molecule which we consume during respiration and during photosynthesis it is released. b) The red coloured element which we use in match boxes. c) The pale blue gas which forms a layer that absorbs sun's UV radiation.
Answer» What will be the atomicity of: a) The molecule which we consume during respiration and during photosynthesis it is released. b) The red coloured element which we use in match boxes. c) The pale blue gas which forms a layer that absorbs sun's UV radiation.

9.

What will be the atomicity of: a) The molecule which we consume during respiration and during photosynthesis it is released. b) The red coloured element which we use in match boxes. c) The pale blue gas which forms a layer that absorbs sun's UV radiation.

Answer»

What will be the atomicity of:

a) The molecule which we consume during respiration and during photosynthesis it is released.

b) The red coloured element which we use in match boxes.

c) The pale blue gas which forms a layer that absorbs sun's UV radiation.

Discussion

10.	Which one of the following reaction is not balanced?
Answer» Which one of the following reaction is not balanced?

Discussion

11.	When water is added to calcium oxide, we get calcium hydroxide which turns pink on addition of phenolphthalein. Predict the nature of calcium oxide.
Answer» When water is added to calcium oxide, we get calcium hydroxide which turns pink on addition of phenolphthalein. Predict the nature of calcium oxide.

11.

When water is added to calcium oxide, we get calcium hydroxide which turns pink on addition of phenolphthalein. Predict the nature of calcium oxide.

Answer»

When water is added to calcium oxide, we get calcium hydroxide which turns pink on addition of phenolphthalein. Predict the nature of calcium oxide.

Discussion

12.	What is an amalgam?
Answer» What is an amalgam?

Discussion

13.	(a) Name the method by which aluminium metal is extracted. (b) Give the name and chemical formula of one ore of copper. (c) How is zinc extracted from its carbonate ore (calamine) ? Explain with equations.
Answer» (a) Name the method by which aluminium metal is extracted. (b) Give the name and chemical formula of one ore of copper. (c) How is zinc extracted from its carbonate ore (calamine) ? Explain with equations.

Discussion

14.	In the extraction of metallic zinc from zinc oxide, the reducing agent used is__.
Answer» In the extraction of metallic zinc from zinc oxide, the reducing agent used is__.

Discussion

15.	Which is the hardest known substance? What is the chemical composition of this substance? [2 MARKS]
Answer» Which is the hardest known substance? What is the chemical composition of this substance? [2 MARKS]

Discussion

16.	If Cl, Br, I, is a Dobereiner's triad and the atomic masses of Cl and I are 35.5u and 127u respectively, then the atomic mass of Br is
Answer» If Cl, Br, I, is a Dobereiner's triad and the atomic masses of Cl and I are 35.5u and 127u respectively, then the atomic mass of Br is

Discussion

17.	Cobalt chloride paper is _________ in colour when moist.
Answer» Cobalt chloride paper is _________ in colour when moist.

Discussion

18.	The ore of zinc containing its sulphide is:
Answer» The ore of zinc containing its sulphide is:

Discussion

19.	Atoms of eight elements A, B, C, D, E, F, G and H have the same number of electron shells but a different number of electrons in their outermost shells. It was found that elements A and G combine to form an ionic compound. This ionic compound is added in a small amount to almost all vegetables and dishes during cooking. Oxides of elements A and B are basic in nature while those of elements E and F are acidic. The oxide of element D is, however, almost neutral. Based on the above information, answer the following questions : (a) To which group or period of the periodic table do these elements belong? (b) What would be the nature of the compound formed by a combination of elements B and F? (c) Which two of these elements could definitely be metals? (d) Which one of the eight elements is most likely to be found in the gaseous state at room temperature? (e) If the number of electrons in the outermost shell of elements C and G is 3 and 7 respectively, write the formula of the compound formed by the combination of C and G.
Answer» Atoms of eight elements A, B, C, D, E, F, G and H have the same number of electron shells but a different number of electrons in their outermost shells. It was found that elements A and G combine to form an ionic compound. This ionic compound is added in a small amount to almost all vegetables and dishes during cooking. Oxides of elements A and B are basic in nature while those of elements E and F are acidic. The oxide of element D is, however, almost neutral. Based on the above information, answer the following questions : (a) To which group or period of the periodic table do these elements belong? (b) What would be the nature of the compound formed by a combination of elements B and F? (c) Which two of these elements could definitely be metals? (d) Which one of the eight elements is most likely to be found in the gaseous state at room temperature? (e) If the number of electrons in the outermost shell of elements C and G is 3 and 7 respectively, write the formula of the compound formed by the combination of C and G.

19.

Atoms of eight elements A, B, C, D, E, F, G and H have the same number of electron shells but a different number of electrons in their outermost shells. It was found that elements A and G combine to form an ionic compound. This ionic compound is added in a small amount to almost all vegetables and dishes during cooking. Oxides of elements A and B are basic in nature while those of elements E and F are acidic. The oxide of element D is, however, almost neutral. Based on the above information, answer the following questions : (a) To which group or period of the periodic table do these elements belong? (b) What would be the nature of the compound formed by a combination of elements B and F? (c) Which two of these elements could definitely be metals? (d) Which one of the eight elements is most likely to be found in the gaseous state at room temperature? (e) If the number of electrons in the outermost shell of elements C and G is 3 and 7 respectively, write the formula of the compound formed by the combination of C and G.

Answer»

Atoms of eight elements A, B, C, D, E, F, G and H have the same number of electron shells but a different number of electrons in their outermost shells. It was found that elements A and G combine to form an ionic compound. This ionic compound is added in a small amount to almost all vegetables and dishes during cooking. Oxides of elements A and B are basic in nature while those of elements E and F are acidic. The oxide of element D is, however, almost neutral. Based on the above information, answer the following questions :

(a) To which group or period of the periodic table do these elements belong?

(b) What would be the nature of the compound formed by a combination of elements B and F?

(c) Which two of these elements could definitely be metals?

(d) Which one of the eight elements is most likely to be found in the gaseous state at room temperature?

(e) If the number of electrons in the outermost shell of elements C and G is 3 and 7 respectively, write the formula of the compound formed by the combination of C and G.

Discussion

20.	Question 18 The correct structural formula of butanoic acid is (a) (b) (c) (d)
Answer» Question 18 The correct structural formula of butanoic acid is (a) (b) (c) (d)

Discussion

21.	What volume of oxygen at STP is required to affect the combustion of 11 litres of ethylene at 273 C and 380 mm of Hg pressure?
Answer» What volume of oxygen at STP is required to affect the combustion of 11 litres of ethylene at 273 C and 380 mm of Hg pressure?

Discussion

22.	Complete the given reaction. KNO3(s) Δ→ KNO2(s) + (g)
Answer» Complete the given reaction. $K N O_{3} (s) Δ \to K N O_{2} (s) +$ $(g)$

Discussion

23.	The chain isomer of cyclobutane is :
Answer» The chain isomer of cyclobutane is :

Discussion

24.	Why do we use blue color solution after washing white clothes?
Answer» Why do we use blue color solution after washing white clothes?

Discussion

25.	What is meant by smelting in metallurgy?
Answer» What is meant by smelting in metallurgy?

Discussion

26.	Two volumes of ethane at STP will need ______ of oxygen at STP for complete combustion.
Answer» Two volumes of ethane at STP will need ______ of oxygen at STP for complete combustion.

Discussion

27.	Explain the terms 'producer' and 'consumer'. Give two examples of producers and two of consumers.
Answer» Explain the terms 'producer' and 'consumer'. Give two examples of producers and two of consumers.

Discussion

28.	How is the concentration of hydronium ion H3O+ affected when solution of an acid is diluted with water? [1 MARK]
Answer» How is the concentration of hydronium ion $H_{3} O^{+}$ affected when solution of an acid is diluted with water? [1 MARK]

Discussion

29.	What are 's' block elemnts? Name the type of elemts present in it.
Answer» What are 's' block elemnts? Name the type of elemts present in it.

Discussion

30.	What is the difference between phyical and chemical properties of alcohol and aldehyde
Answer» What is the difference between phyical and chemical properties of alcohol and aldehyde

Discussion

31.	Give 3 examples of acid reaction with metal
Answer» Give 3 examples of acid reaction with metal

Discussion

32.	When zinc react with hot and concentrated NaOH, a colourless salt is formed. Name this colourless salt.
Answer» When zinc react with hot and concentrated NaOH, a colourless salt is formed. Name this colourless salt.

Discussion

33.	What is sucrose
Answer» What is sucrose

Discussion

34.	why is there a need to write down the state of a compound in a chemical reaction
Answer» why is there a need to write down the state of a compound in a chemical reaction

Discussion

35.	What happens when zinc oxide reacts with hydrochloric acid?
Answer» What happens when zinc oxide reacts with hydrochloric acid?

Discussion

36.	What is metallurgy
Answer» What is metallurgy

Discussion

37.	Which amongst the following is the condensed formula of the given compound?
Answer» Which amongst the following is the condensed formula of the given compound?

Discussion

38.	Is aluminium a good conductor of electricity?
Answer» Is aluminium a good conductor of electricity?

Discussion

39.	What happens when a atom doesn't have stability
Answer» What happens when a atom doesn't have stability

Discussion

40.	What is the difference between evolution of gas and change in temperature
Answer» What is the difference between evolution of gas and change in temperature

Discussion

41.	What happens when carbon dioxide gas is passed through lime water and why does it is disappear when excess carbon dioxide
Answer» What happens when carbon dioxide gas is passed through lime water and why does it is disappear when excess carbon dioxide

Discussion

42.	A substance 'A' does not dissociate completely into its ions in the aqueous solutions. It is bitter in taste and soapy to touch. Identify the substance A.
Answer» A substance 'A' does not dissociate completely into its ions in the aqueous solutions. It is bitter in taste and soapy to touch. Identify the substance A.

Discussion

43.	The reducing agent undergoes _____ of electrons.
Answer» The reducing agent undergoes _____ of electrons.

Discussion

44.	What are primary cells?
Answer» What are primary cells?

Discussion

45.	Litmus solution is a purple dye, which is extracted from:
Answer» Litmus solution is a purple dye, which is extracted from:

Discussion

46.	Tap water is not used to prepare a solution of silver nitrate in the laboratory. Why?
Answer» Tap water is not used to prepare a solution of silver nitrate in the laboratory. Why?

Discussion

47.	The formula for calculating the number of gram atoms is
Answer» The formula for calculating the number of gram atoms is

Discussion

48.	pH of an acid is:
Answer» pH of an acid is:

Discussion

49.	___is the stage at which the rate of the forward reaction becomes equal to the rate of the backward reaction in a chemical reaction.
Answer» ___is the stage at which the rate of the forward reaction becomes equal to the rate of the backward reaction in a chemical reaction.

Discussion

50.	If the empirical formula of two compounds is CH and their vapour densities are 13 and 39 respectively, find their molecular formula.
Answer» If the empirical formula of two compounds is CH and their vapour densities are 13 and 39 respectively, find their molecular formula.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The chemical formula of the ionic compound containing Fe3+ and (SO4)2−is____.

Which one of the elements has the maximum electron affinity ?

Name the given structure: CH3 - CH - CH = CH2 . I . CH2 . I . CHO

Which is the most electro positive element?

How to find the position of the elements in the modern periodic table

A white precipitate will be formed if we add common salt solution to : (a) Ba(NO3)2 solution (b) KNO3 solution (c) AgNO3 solution (d) Mg(NO3)2 solution

What happens when calcium nitrate reacts with ammonium hydroxide?

What will be the atomicity of: a) The molecule which we consume during respiration and during photosynthesis it is released. b) The red coloured element which we use in match boxes. c) The pale blue gas which forms a layer that absorbs sun's UV radiation.

Which one of the following reaction is not balanced?

When water is added to calcium oxide, we get calcium hydroxide which turns pink on addition of phenolphthalein. Predict the nature of calcium oxide.

What is an amalgam?

(a) Name the method by which aluminium metal is extracted. (b) Give the name and chemical formula of one ore of copper. (c) How is zinc extracted from its carbonate ore (calamine) ? Explain with equations.

In the extraction of metallic zinc from zinc oxide, the reducing agent used is__.

Which is the hardest known substance? What is the chemical composition of this substance? [2 MARKS]

If Cl, Br, I, is a Dobereiner's triad and the atomic masses of Cl and I are 35.5u and 127u respectively, then the atomic mass of Br is

Cobalt chloride paper is _________ in colour when moist.

The ore of zinc containing its sulphide is:

Question 18 The correct structural formula of butanoic acid is (a) (b) (c) (d)

What volume of oxygen at STP is required to affect the combustion of 11 litres of ethylene at 273 C and 380 mm of Hg pressure?

Complete the given reaction. KNO3(s) Δ→ KNO2(s) + (g)

The chain isomer of cyclobutane is :

Why do we use blue color solution after washing white clothes?

What is meant by smelting in metallurgy?

Two volumes of ethane at STP will need ______ of oxygen at STP for complete combustion.

Explain the terms 'producer' and 'consumer'. Give two examples of producers and two of consumers.

How is the concentration of hydronium ion H3O+ affected when solution of an acid is diluted with water? [1 MARK]

What are 's' block elemnts? Name the type of elemts present in it.

What is the difference between phyical and chemical properties of alcohol and aldehyde

Give 3 examples of acid reaction with metal

When zinc react with hot and concentrated NaOH, a colourless salt is formed. Name this colourless salt.

What is sucrose

why is there a need to write down the state of a compound in a chemical reaction

What happens when zinc oxide reacts with hydrochloric acid?

What is metallurgy

Which amongst the following is the condensed formula of the given compound?

Is aluminium a good conductor of electricity?

What happens when a atom doesn't have stability

What is the difference between evolution of gas and change in temperature

What happens when carbon dioxide gas is passed through lime water and why does it is disappear when excess carbon dioxide

A substance 'A' does not dissociate completely into its ions in the aqueous solutions. It is bitter in taste and soapy to touch. Identify the substance A.

The reducing agent undergoes _____ of electrons.

What are primary cells?

Litmus solution is a purple dye, which is extracted from:

Tap water is not used to prepare a solution of silver nitrate in the laboratory. Why?

The formula for calculating the number of gram atoms is

pH of an acid is:

___is the stage at which the rate of the forward reaction becomes equal to the rate of the backward reaction in a chemical reaction.

If the empirical formula of two compounds is CH and their vapour densities are 13 and 39 respectively, find their molecular formula.