Stoichiometry MCQs

Question 1

Viscosity of atmospheric air may be about __________ centipoise.

Accepted Answer

0.015

Answer

1.5

Answer

15

Answer

150

Question 2

Heat of __________ of a fuel is called its calorific value.

Accepted Answer

Combustion

Answer

Formation

Answer

Reaction

Answer

Vaporisation

Question 3

The chemical nature of an element is independent of

Accepted Answer

The number of neutrons present in it

Answer

Its atomic number

Answer

The number of protons or electrons present in it

Answer

None of these

Question 4

A fluid gas produced on burning furnace oil contains 0.15 gm mole of CO 2 , 0.05 gm mole of oxygen and 0.80 gm mole of N 2 . What is its molecular weight?

Accepted Answer

30.6

Answer

28.6

Answer

30

Answer

32.6

Question 5

The pressure of 'V' litres of a dry gas is increased from 1 to 2 kgf/cm 2 at a constant temperature. The new volume will become

Accepted Answer

$$\frac{{	ext{V}}}{2}$$

Answer

2V

Answer

$$\frac{{	ext{V}}}{4}$$

Answer

V 2

Question 6

Isotopes are atoms having the same

Accepted Answer

None of these

Answer

Mass number

Answer

Number of neutrons

Answer

Atomic mass

Question 7

At a constant volume, for a fixed number of moles of a gas, the pressure of the gas increases with rise of temperature due to

Accepted Answer

Increase in molecular attraction

Answer

Decrease in mean free path

Answer

Increased collision rate among molecules

Answer

Increase in average molecular speed

Question 8

Avogadro's number is equal to

Accepted Answer

6.023 × 10 23 molecules/gm.mole

Answer

6.023 × 10 23 molecules/kg.mole

Answer

6.023 × 10 16 molecules/kg.mole

Answer

6.023 × 10 26 molecules/gm.mole

Question 9

If 1 Nm 3 of O 2 contains 'N' number of molecules, then number of molecules in 2 Nm 3 of SO 2 will be

Accepted Answer

2N

Answer

N

Answer

$$\frac{{	ext{N}}}{2}$$

Answer

4N