MCQs on States of Matter

MCQs on States of Matter

1. A container with a pin-hole contains equal moles of H_2(g) and O_2(g). Find the fraction of oxygen gas escaped at the same time when one-fourth of hydrogen gas escapes

(a) 1/16

(b) 1/4

(c) 1/2

(d) 1/8

Answer: (a)

2. What are the conditions for gas like Carbon monoxide to obey the ideal gas laws?

(a) low temperature and low pressure

(b) low temperature and high pressure

(c) high temperature and low pressure

(d) high temperature and high pressure

Answer: (c)

3. If the temperature is doubled, the average velocity of a gaseous molecule increases by

(a) 4

(b) 1.4

(c) 2

(d) 2.8

Answer: (b)

4. Find the molecular mass of a gas that takes three times more time to effuse as compared to He with the same volume

(a) 9 u

(b) 64 u

(c) 27 u

(d) 36 u

Answer: (d)

5. At the same temperature, the average molar kinetic energy of N₂ and CO is

(a) KE₁ > KE₂

(b) KE₁ < KE₂

(c) KE₁ = KE₂

(d) insufficient information given

Answer: (c)

6. Find the temperature at which the rate of effusion of N₂ is 1.625 times to that of SO₂ at 500℃

(a) 620℃

(b) 173℃

(c) 110℃

(d) 373℃

Answer: (a)

7. Find the change in the root mean square speed of the gas on raising the temperature from 27℃ to 927℃

(a) becomes times

(b) gets doubled

(c) gets halved

(d) remains same

Answer: (b)

8. Find the relation between probable velocity, mean velocity and root mean square velocity

(a)

(b)

 

(c)

 

(d)

 

Answer: (c)

9. If 1.204 x 10²¹ molecules of H₂SO₄ are removed from 392 mg of H₂SO₄, find the moles of H₂SO₄ left.

(a) 4 x 10^-3

(b) 1.5 x 10^-3

(c) 1.2 x 10^-3

(d) 2 x 10^-3

Answer: (d)

10. Find the fraction of the total pressure exerted by hydrogen if it is mixed with ethane in an empty container at 25℃

(a) 15/16

(b) 1/16

(c) 1/2

(d) 1

Answer: (a)