Questions and answers for exam Preparation

MCQs

Total Questions : 137 | Page 2 of 14 pages

Question 11. Regarding the atom of a chemical element, magnetic quantum number refers to

orientation
shape
size
spin

Discuss Question

Answer: Option A. -> orientation
:
A
Option:(a)

Question 12. Assertion (A) : In the periodic table of chemical increase from top to bottom in a group
Reason (R) : In a group, the atomic radii generally increase from top to bottom.

Both A and R are individually true and R is the correct explanation of A
Both A and R are individually true but R is not the correct explanation of A
A is true but R is false
A is false but is true

Discuss Question

Answer: Option D. -> A is false but is true
:
D
Option:(d)

Question 13. Consider the following chemicals
(a) Benzene
(b) Carbon tetrachloride
(c) Sodium carbonate
(d) Trichloroethylene
Which of the above is/are used as dry cleaning chemical?

(a) only
(b) only
(a), (b) and (d) only
(a), (b), (c) and (d)

Discuss Question

Answer: Option C. -> (a), (b) and (d) only
:
C
Option:(c)

Question 14. Match List I and List II and select the correct
List I (Process)                 List II (Changes)
A. Evaporation           1. liquid into gas
B. Sublimation           2. gas into liquid
C. Freezing                 3. solid into gas
D. Melting                  4. solid into liquid
                                     5. Liquid into solid

1 2 4 3
3 1 2 4
2 1 4 3
2 1 3 4

Discuss Question

Answer: Option D. -> 2 1 3 4
:
D
Option:(d)

Question 15. Match List I and List II and select the correct answer by using the codes given below the lists.
List I                            List II
A. Aluminium     1. Monazite
B. Uranium         2. Pitch blende
C. Thorium         3. Bauxite
D. Lead               4. Galena
                            5. Haematite

5 3 2 4
3 2 4 1
3 2 1 4
2 3 1 5

Discuss Question

Answer: Option C. -> 3 2 1 4
:
C
Option:(c)

Question 16. In the manufacturing of safety matches, which of the following materials are used to coat the two sides of match boxes?
(a) Yellow phosphorus
(b) Glue
(c) Glass powder
(d) Red phosphorus

(a), (b) and (c)
(a), (c) and (d)
(a), (b) and (d)
(b), (c) and (d)

Discuss Question

Answer: Option C. -> (a), (b) and (d)
:
C
Option:(c)

Question 17. Match List I and List II and select the correct answer by using the codes given below
List I                                List II
A. Melamine          1. electric fittings
B. Teflon                 2. Cups and crockery
C. Bakelite              3. Raincoats
D. PVC                     4. Non-stick utensils

2 1 4 3
2 4 1 3
3 2 1 4
3 1 2 4

Discuss Question

Answer: Option B. -> 2 4 1 3
:
B
Option:(b)

Question 18. Chlorination is a process used for water purification. The disinfecting action of chlorine is mainly due to

the formation of hydrochloric acid when chlorine is added to water
the formation of hypochlorous acid when chlorine is added to water
the formation of nascent oxygen when chlorine is added to water
the formation of hydrogen when chlorine is added to water

Discuss Question

Answer: Option B. -> the formation of hypochlorous acid when chlorine is added to water
:
B
Option: (b)

Question 19. Consider the following statements In nuclear power reactors
(a) Uranium-235 is used as the fission material.
(b) Graphite is used as a moderator.
(c) Rods of lead are used to control the rate of nuclear reaction.
Which of the above statements are correct?