States of Matter Objective Questions

1. A sample of gas occupies 10 L under a pressure of 1 atm. What will be its volume if the pressure is increased to 2 atm? Assuming that the temperature of the gas sample does not change-

(i) 2 L

(ii) 5 L

(iii) 10 L

(iv) 1 L

2. A gas at a pressure of 5 atm is heated from 0° to 546°C and simultaneously compressed to 1/3rd of its original volume. Hence the final pressure is-

(i) 10 atm

(ii) 45 atm

(iii) 30 atm

(iv) 5 a

3. How much should the pressure be increased to decrease the volume of a gas by 5% at a constant temperature?

(i) 5%

(ii) 5.26%

(iii) 10%

(iv) 4.26%

4. When the temperature is raised through 1°C the volume is increased by 1/273th times of the original volume. This is-

(i) Boyle’s Law

(ii) Charles’ Law

(iii) Avogadro Law

(iv) Graham’s Law

5. To what temperature must a neon gas sample be heated to double its pressure if the initial volume of gas at 75°C is decreased by 15.0%?

(i) 591.6 K

(ii) 492.8 K

(iii) 592 K

(iv) 642 K

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6. When a gas-filled in a closed vessel is heated through 1°C, its pressure is increased by 0.4%. The initial temperature of the gas was –

(i) 250 K

(ii) 2500 K

(iii) 250°C

(iv) 25°C

7. One gram molecules of a gas at N.T.P. occupy 22.4 liters. This fact was derived from –

(i) Dalton’s theory

(ii) Avogadro’s hypothesis

(iii) Berzelius hypothesis

(iv) Law of gaseous volume

8. A sample of gas at 1.2 atm and 27°C is heated at constant pressure to 57°C. Its final volume is found to be 4.75 liters. What was its original volume?

(i) 4.32 liters

(ii) 5.02 liters

(iii) 4.22 liters

(iv) None of these

9. If the density of a certain gas at 30°C and 768 torr is 1.35 kg/m3 its density at STP would be

(i) 1.49 kg/m³

(ii) 1.58 kg/m³

(iii) 1.25 kg/m³

(iv) 1.4 kg/m³

10. A vessel has 6 g of oxygen at a pressure P and temperature 400 K. A small hole is made in it so that O2 leaks out. How much O2 leaks out if the pressure is P/2 and temperature 300 K?

(i) 5 g

(ii) 4 g

(iii) 2 g

(iv) 3 g

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