7248 + Interview Questions in Chemistry

1.	What is octane number and cetane number?
Answer» What is octane number and cetane number?

Discussion

2.	Research and find out the thickness of a hair and radius of an atom. Then convert this into exponential form
Answer» Research and find out the thickness of a hair and radius of an atom. Then convert this into exponential form

Discussion

3.	What are the possible harmful effects of burning fossil fuels?
Answer» What are the possible harmful effects of burning fossil fuels?

Discussion

4.	Identify the example of an element from the following options.
Answer» Identify the example of an element from the following options.

Discussion

5.	what is law of conservation of mass??
Answer» what is law of conservation of mass??

Discussion

6.	Why do each energy shell of atom can hold only a particular number of electrons?
Answer» Why do each energy shell of atom can hold only a particular number of electrons?

Discussion

7.	On the basis of the reactivity series of metals, predict how these metals will react with each of the following salt solutions: Metals: magnesium, zinc, copper, iron, and potassium Salt solutions: magnesium sulphate, zinc sulphate, copper sulphate, iron sulphate,and potassium sulphate
Answer» On the basis of the reactivity series of metals, predict how these metals will react with each of the following salt solutions: Metals: magnesium, zinc, copper, iron, and potassium Salt solutions: magnesium sulphate, zinc sulphate, copper sulphate, iron sulphate,and potassium sulphate

7.

On the basis of the reactivity series of metals, predict how these metals will react with each of the following salt solutions: Metals: magnesium, zinc, copper, iron, and potassium Salt solutions: magnesium sulphate, zinc sulphate, copper sulphate, iron sulphate,and potassium sulphate

Answer»

On the basis of the reactivity series of metals, predict how these metals will react with each of the following salt solutions:

Metals: magnesium, zinc, copper, iron, and potassium

Salt solutions: magnesium sulphate, zinc sulphate, copper sulphate, iron sulphate,and potassium sulphate

Discussion

8.	How is carbon monoxide gas formed?
Answer» How is carbon monoxide gas formed?

Discussion

9.	Question 1 A substance which reacts with oxygen giving heat is called a combustible substance. Which, one of the following is a combustible substance? (a) Iron nail (b) Glass (c) Stone piece (d) Wood
Answer» Question 1 A substance which reacts with oxygen giving heat is called a combustible substance. Which, one of the following is a combustible substance? (a) Iron nail (b) Glass (c) Stone piece (d) Wood

Discussion

10.	Why do you have to use paper or kerosene oil to start fire in wood or coal ?
Answer» Why do you have to use paper or kerosene oil to start fire in wood or coal ?

Discussion

11.	Question 26 Match the items given in Column I with the items of Column II. Column IColumn II(a)Used for road surfacing (i)Black gold(b)Natural gas(ii)Vaseline and candles(c)Petroleum (iii)Bitumen(d)Paraffin wax (iv)CNG
Answer» Question 26 Match the items given in Column I with the items of Column II. $\begin{matrix} Column I & Column II (a)Used for road surfacing & (i)Black gold (b)Natural gas & (ii)Vaseline and candles (c)Petroleum & (iii)Bitumen (d)Paraffin wax & (iv)CNG \end{matrix}$

11.

Question 26 Match the items given in Column I with the items of Column II. Column IColumn II(a)Used for road surfacing (i)Black gold(b)Natural gas(ii)Vaseline and candles(c)Petroleum (iii)Bitumen(d)Paraffin wax (iv)CNG

Answer»

Question 26
Match the items given in Column I with the items of Column II.

$\begin{matrix} Column I & Column II (a)Used for road surfacing & (i)Black gold (b)Natural gas & (ii)Vaseline and candles (c)Petroleum & (iii)Bitumen (d)Paraffin wax & (iv)CNG \end{matrix}$

Discussion

12.	What is chlorofluorocarbons ?
Answer» What is chlorofluorocarbons ?

Discussion

13.	What is the significance of heat in thermal power generation?
Answer» What is the significance of heat in thermal power generation?

Discussion

14.	The synthetic fibre which contains the organic group similar to those which give fruits their 'sweet smell' is : (a) nylon (b) acrylic (c) terylene (d) rayon
Answer» The synthetic fibre which contains the organic group similar to those which give fruits their 'sweet smell' is : (a) nylon (b) acrylic (c) terylene (d) rayon

14.

The synthetic fibre which contains the organic group similar to those which give fruits their 'sweet smell' is : (a) nylon (b) acrylic (c) terylene (d) rayon

Answer»

The synthetic fibre which contains the organic group similar to those which give fruits their 'sweet smell' is :

(a) nylon (b) acrylic (c) terylene (d) rayon

Discussion

15.	What is recycling of paper
Answer» What is recycling of paper

Discussion

16.	When sodium chloride is added to a definite volume of water and stirred well, a solution is formed, but there is no increase in the level of water. Why?
Answer» When sodium chloride is added to a definite volume of water and stirred well, a solution is formed, but there is no increase in the level of water. Why?

Discussion

17.	The chemical bond formed due to an electrostatic force of attraction between the oppositely charged cation and the anion is called a/an___ bond.
Answer» The chemical bond formed due to an electrostatic force of attraction between the oppositely charged cation and the anion is called a/an___ bond.

Discussion

18.	Contamination of Ganga leads to ___ .
Answer» Contamination of Ganga leads to ___ .

Discussion

19.	Explain the process of eutrophication.
Answer» Explain the process of eutrophication.

Discussion

20.	Mass of an atom of hydrogen is equivalent to 1/12th the mass of a/an _______ atom.
Answer» Mass of an atom of hydrogen is equivalent to 1/12th the mass of a/an _______ atom.

Discussion

21.	Why people say that we should never light a matchstick during the leakage of LPG in the kitchen?
Answer» Why people say that we should never light a matchstick during the leakage of LPG in the kitchen?

Discussion

22.	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

23.	It has been noticed that silverware becomes black faster today than it did 50 years ago what can be the reason for this
Answer» It has been noticed that silverware becomes black faster today than it did 50 years ago what can be the reason for this

Discussion

24.	The jeans we wear is made up of which of the following fabric material?
Answer» The jeans we wear is made up of which of the following fabric material?

Discussion

25.	Which of the following petroleum product is used to make candles?
Answer» Which of the following petroleum product is used to make candles?

Discussion

26.	Question 3 (b) Metals are good conductors of heat and___.
Answer» Question 3 (b) Metals are good conductors of heat and___.

Discussion

27.	Why do HCl, HNO3 , etc. show acidic character in aqueous solutions while solutions of compounds like, C2H5OH and glucose do not show acidic character? Why does an aqueous solution of an acid conducts electricity? [3 MARKS]
Answer» Why do HCl, ${H N O}_{3}$ , etc. show acidic character in aqueous solutions while solutions of compounds like, $C_{2} H_{5} O H$ and glucose do not show acidic character? Why does an aqueous solution of an acid conducts electricity? [3 MARKS]

Discussion

28.	Which constituent of petroleum is used in this:
Answer» Which constituent of petroleum is used in this:

28.

Which constituent of petroleum is used in this:

Answer»

Which constituent of petroleum is used in this:

Discussion

29.	Estimate the value x to balance the given equation. Mg3N2 (aq)+xH2O (l)→3Mg(OH)2 (aq)+2NH3 (g)6
Answer» Estimate the value $x$ to balance the given equation. $M g_{3} N_{2} (a q) + x H_{2} O (l) \to 3 M g (O H)_{2} (a q) + 2 N H_{3} (g)$ 6

Discussion

30.	(a) What are the two main features of Rutherford's atomic model ? (b) State its one drawback.
Answer» (a) What are the two main features of Rutherford's atomic model ? (b) State its one drawback.

30.

(a) What are the two main features of Rutherford's atomic model ? (b) State its one drawback.

Answer»

(a) What are the two main features of Rutherford's atomic model ?

(b) State its one drawback.

Discussion

31.	Fossil fuels are exhaustible natural resources because:
Answer» Fossil fuels are exhaustible natural resources because:

Discussion

32.	Which ion kidney releases if acidity in stomach increases?
Answer» Which ion kidney releases if acidity in stomach increases?

Discussion

33.	Which experiment concluded that atomic mass is present?
Answer» Which experiment concluded that atomic mass is present?

Discussion

34.	What is the meaning of incandescence???
Answer» What is the meaning of incandescence???

Discussion

35.	(a) Where is the nucleus of an atom situated ? (b) What are orbits or shells of an atom ? (c)What are isotopes ? How does the existence of isotopes contradict Dalton's atomic theory ?
Answer» (a) Where is the nucleus of an atom situated ? (b) What are orbits or shells of an atom ? (c)What are isotopes ? How does the existence of isotopes contradict Dalton's atomic theory ?

35.

(a) Where is the nucleus of an atom situated ? (b) What are orbits or shells of an atom ? (c)What are isotopes ? How does the existence of isotopes contradict Dalton's atomic theory ?

Answer»

(a) Where is the nucleus of an atom situated ?

(b) What are orbits or shells of an atom ?

(c)What are isotopes ? How does the existence of isotopes contradict Dalton's atomic theory ?

Discussion

36.	The combustion in which the gas burns rapidly and produces heat and light is known as__ combustion.
Answer» The combustion in which the gas burns rapidly and produces heat and light is known as__ combustion.

Discussion

37.	The substance that is composed of two or more elements, chemically combined with one-another in a fixed proportion of mass is called ___.
Answer» The substance that is composed of two or more elements, chemically combined with one-another in a fixed proportion of mass is called ___.

Discussion

38.	Which of the following gas is released when an acid reacts with metal?
Answer» Which of the following gas is released when an acid reacts with metal?

Discussion

39.	How will you prove the nature of metal oxides? [3 MARKS]
Answer» How will you prove the nature of metal oxides? [3 MARKS]

Discussion

40.	Aisu upon finding her watch to be running slowly decided to replace its battery. Which of the following type of battery might she possibly select for her watch?
Answer» Aisu upon finding her watch to be running slowly decided to replace its battery. Which of the following type of battery might she possibly select for her watch?

Discussion

41.	What happens to water if (a) it is kept in a deep freezer? (b) it is heated? Explain the phenomenon of change of state of water.
Answer» What happens to water if (a) it is kept in a deep freezer? (b) it is heated? Explain the phenomenon of change of state of water.

41.

What happens to water if (a) it is kept in a deep freezer? (b) it is heated? Explain the phenomenon of change of state of water.

Answer»

What happens to water if

(a) it is kept in a deep freezer?

(b) it is heated?

Explain the phenomenon of change of state of water.

Discussion

42.	Can a brick on heating change to liquid state of the brick?
Answer» Can a brick on heating change to liquid state of the brick?

Discussion

43.	What is. an exothermic reaction
Answer» What is. an exothermic reaction

Discussion

44.	Which of the following materials cannot be used to make a lens?
Answer» Which of the following materials cannot be used to make a lens?

Discussion

45.

Relative abundance of isotopes of carbon are as follows:- Isotopes Relative abundance Atomic Mass C-12 98.892 12 C-13 1.108 13.00335 C-14 2×10−10 14.00317 The average atomic mass of carbon will be:-

Answer»

Relative abundance of isotopes of carbon are as follows:-

Isotopes	Relative abundance	Atomic Mass
C-12	$98.892$	12
C-13	$1.108$	13.00335
C-14	$2 \times 10^{- 10}$	14.00317

The average atomic mass of carbon will be:-

Discussion

46.	Fires in underground coal mines usually occur due to the : (a) explosive combustion (b) deliberate combustion (c) spontaneous combustion (d) rapid combustion
Answer» Fires in underground coal mines usually occur due to the : (a) explosive combustion (b) deliberate combustion (c) spontaneous combustion (d) rapid combustion

46.

Fires in underground coal mines usually occur due to the : (a) explosive combustion (b) deliberate combustion (c) spontaneous combustion (d) rapid combustion

Answer»

Fires in underground coal mines usually occur due to the :

(a) explosive combustion

(b) deliberate combustion

(c) spontaneous combustion

(d) rapid combustion

Discussion

47.	When somebody puts acetone (nail polish remover) on our hand, we experience a cooling sensation. Why?
Answer» When somebody puts acetone (nail polish remover) on our hand, we experience a cooling sensation. Why?

Discussion

48.	Exposure to carbon monoxide (ex., coal gas) is extremely dangerous and can kill a person because -
Answer» Exposure to carbon monoxide (ex., coal gas) is extremely dangerous and can kill a person because -

Discussion

49.	Which of the following is crystalline form of carbon?
Answer» Which of the following is crystalline form of carbon?

Discussion

50.	Which among the following is not a product obtained from petroleum refining?
Answer» Which among the following is not a product obtained from petroleum refining?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

What is octane number and cetane number?

Research and find out the thickness of a hair and radius of an atom. Then convert this into exponential form

What are the possible harmful effects of burning fossil fuels?

Identify the example of an element from the following options.

what is law of conservation of mass??

Why do each energy shell of atom can hold only a particular number of electrons?

On the basis of the reactivity series of metals, predict how these metals will react with each of the following salt solutions: Metals: magnesium, zinc, copper, iron, and potassium Salt solutions: magnesium sulphate, zinc sulphate, copper sulphate, iron sulphate,and potassium sulphate

How is carbon monoxide gas formed?

Question 1 A substance which reacts with oxygen giving heat is called a combustible substance. Which, one of the following is a combustible substance? (a) Iron nail (b) Glass (c) Stone piece (d) Wood

Why do you have to use paper or kerosene oil to start fire in wood or coal ?

Question 26 Match the items given in Column I with the items of Column II. Column IColumn II(a)Used for road surfacing (i)Black gold(b)Natural gas(ii)Vaseline and candles(c)Petroleum (iii)Bitumen(d)Paraffin wax (iv)CNG

What is chlorofluorocarbons ?

What is the significance of heat in thermal power generation?

The synthetic fibre which contains the organic group similar to those which give fruits their 'sweet smell' is : (a) nylon (b) acrylic (c) terylene (d) rayon

What is recycling of paper

When sodium chloride is added to a definite volume of water and stirred well, a solution is formed, but there is no increase in the level of water. Why?

The chemical bond formed due to an electrostatic force of attraction between the oppositely charged cation and the anion is called a/an___ bond.

Contamination of Ganga leads to ___ .

Explain the process of eutrophication.

Mass of an atom of hydrogen is equivalent to 1/12th the mass of a/an _______ atom.

Why people say that we should never light a matchstick during the leakage of LPG in the kitchen?

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

It has been noticed that silverware becomes black faster today than it did 50 years ago what can be the reason for this

The jeans we wear is made up of which of the following fabric material?

Which of the following petroleum product is used to make candles?

Question 3 (b) Metals are good conductors of heat and___.

Why do HCl, HNO3 , etc. show acidic character in aqueous solutions while solutions of compounds like, C2H5OH and glucose do not show acidic character? Why does an aqueous solution of an acid conducts electricity? [3 MARKS]

Which constituent of petroleum is used in this:

Estimate the value x to balance the given equation. Mg3N2 (aq)+xH2O (l)→3Mg(OH)2 (aq)+2NH3 (g)6

(a) What are the two main features of Rutherford's atomic model ? (b) State its one drawback.

Fossil fuels are exhaustible natural resources because:

Which ion kidney releases if acidity in stomach increases?

Which experiment concluded that atomic mass is present?

What is the meaning of incandescence???

(a) Where is the nucleus of an atom situated ? (b) What are orbits or shells of an atom ? (c)What are isotopes ? How does the existence of isotopes contradict Dalton's atomic theory ?

The combustion in which the gas burns rapidly and produces heat and light is known as__ combustion.

The substance that is composed of two or more elements, chemically combined with one-another in a fixed proportion of mass is called ___.

Which of the following gas is released when an acid reacts with metal?

How will you prove the nature of metal oxides? [3 MARKS]

Aisu upon finding her watch to be running slowly decided to replace its battery. Which of the following type of battery might she possibly select for her watch?

What happens to water if (a) it is kept in a deep freezer? (b) it is heated? Explain the phenomenon of change of state of water.

Can a brick on heating change to liquid state of the brick?

What is. an exothermic reaction

Which of the following materials cannot be used to make a lens?

Relative abundance of isotopes of carbon are as follows:- Isotopes Relative abundance Atomic Mass C-12 98.892 12 C-13 1.108 13.00335 C-14 2×10−10 14.00317 The average atomic mass of carbon will be:-

Fires in underground coal mines usually occur due to the : (a) explosive combustion (b) deliberate combustion (c) spontaneous combustion (d) rapid combustion

When somebody puts acetone (nail polish remover) on our hand, we experience a cooling sensation. Why?

Exposure to carbon monoxide (ex., coal gas) is extremely dangerous and can kill a person because -

Which of the following is crystalline form of carbon?

Which among the following is not a product obtained from petroleum refining?