Chemistry MCQs

Question 1

The number of g-molecule of oxygen in 6.02 x 10 24 CO molecules is

Accepted Answer

5 gram of molecule

Answer

1 gram of molecule

Answer

0.5 gram of molecule

Answer

10 gram of molecule

Question 2

Aerated water contains

Accepted Answer

CO 2

Answer

SO 2

Answer

NO 2

Answer

H 2

Question 3

Supersonic jet causes pollution by thinning of

Accepted Answer

O 3 layer

Answer

O 4 layer

Answer

SO 2 layer

Answer

CO 2 layer

Question 4

The value of gas constant R in Ergs deg –1 mole –1 is

Accepted Answer

8.314 × 10 7

Answer

8.341 × 10 7

Answer

8.413 × 10 7

Answer

4.183 × 10 7

Question 5

Photo chemical smog is a resultant of the reaction among

Accepted Answer

NO 2 , O 3 and peroxy acetyl nitrate in the presence of Sunlight

Answer

High concentration of NO 2 , O 3 , and CO in the evening

Answer

CO, CO 2 and NO 2 at low temperature

Answer

CO, O 2 and peroxy acetyl nitrate in the presence of Sunlight

Question 6

Magnetite is

Accepted Answer

Fe 3 O 4

Answer

Fe 2 O 3

Answer

FeCO 3

Answer

2Fe 2 O 3 . 3H 2 O

Question 7

The value of Avogadro Number is

Accepted Answer

6.023 × 10 23

Answer

6.023 × 10 22

Answer

6.023 × 10 24

Answer

6.023 × 10 25

Question 8

How many neutrons are there in 92 U 238 atom ?

Accepted Answer

146

Answer

92

Answer

238

Answer

330

Question 9

The next higher homologue of C 6 H 14 is

Accepted Answer

C 7 H 16

Answer

C 7 H 14

Answer

C 7 H 12

Answer

C 6 H 12