The pressure of 1 gm of an ideal gas A at 27 °C is found to be 2 bar. When 2 g of another ideal gas B is introduced in the same flask at the same temperature, the pressure becomes 3 bar.

The correct relationship between their molecular masses is -

1. MA=MB

2. 4MA=MB

3. MA= 2MB

4. 2MA=MB

Subtopic:  Ideal Gas Law |
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 A = pV2T2n 

The SI unit for the quantity A is -

1. N m2 K2 mol-1

2. N m4 K mol-1

3. N m2 K3 mol-1 

4. N m4 K2mol-1

 

Subtopic:  Introduction to States of Matter |
 61%
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Assertion (A) Critical temperatures for carbon dioxide and methane are 31.1 °C and –81.9 °C  respectively.
Reason (R) The intermolecular forces of attraction are stronger in CO2 than CH4

 

1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.

Subtopic:  Liquefaction of Gases & Liquid |
 73%
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At 0°C, the density of a certain oxide of a gas at 2 bar is the same as that of dinitrogen at 5 bar.

The molecular mass of the oxide would be -

1. 35 g/mol

2. 45 g/mol

3. 70 g/mol

4. 60 g/mol

Subtopic:  Gas Laws |
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The volume of H2 that would be released when 0.15 g of aluminium reacts at 20 °C and 1 bar pressure with caustic soda is-

1. 225 L

2. 301 mL

3. 156 L

4. 203 mL

Subtopic:  Gas Laws |
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The pressure exerted by a mixture of 3.2 g of methane and 4.4 g of carbon dioxide contained in a 9 dm3 flask at 27 °C would be -

1. 8.31 × 104 Pa
2. 7.43 × 10-4 Pa
3. 6.87 × 103 Pa
4. 8.31 × 106 Pa

Subtopic:  Ideal Gas Law |
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0.5 L of H2 at 0.8 bar and 2.0 L of dioxygen at 0.7 bar are introduced in a 1L vessel at 27°C.

The pressure inside the vessel would be -

1. 3.6 bar

2. 1.8 bar

3. 4.1 bar

4. 0.7 bar

 

Subtopic:  Gas Laws |
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A student forgot to add the reaction mixture to the round-bottomed flask at 27 °C but instead, he placed the flask on the flame. After a lapse of time, he realized his mistake and using a pyrometer he found the temperature of the flask was 477 °C. The fraction of air that would  expel out would be :

1. 1/3

2. 4/5

3. 3/5

4. 2/3

Subtopic:  Gas Laws |
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The total pressure of a mixture that contains 8 g of O2 and 4 g of H2 confined in a vessel of 1 dm3 at 27°would be -

(R = 0.083 bar dmK-1mol-1)

1. 45.67 bar

2. 56.02 bar

3. 34.67 bar

4. 67.13 bar  

 

Subtopic:  Ideal Gas Law |
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Find the mass of payload of a balloon of radius 10 m, if a mass of 100 kg is filled with helium at 1.66 bar and 27°C temperature.

(Density of air = 1.2 kg m3 and R = 0.083 bar dm3 K1 mol1).

1. 2905 Kg

2. 3811 Kg 

3. 2721 Kg

4. 4201 Kg                                                                                                                

Subtopic:  Ideal Gas Law |
 56%
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