equal masses of methane and hydrogen are mixed in an empty container at 25°C. The fraction of the total pressure exerted by hydrogen is

1. 1/2

2. 8/9

3. 1/9

4. 16/17

Subtopic:  Dalton's Law |
 77%
From NCERT
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A 2.24 L cylinder of oxygen at STP is found to develop a leakage. When the leakage was plugged, the pressure dropped to 570 mm of Hg. The number of moles of gas that escaped will be:

1. 0.050

2. 0.025

3. 0.075

4. 0.01

Subtopic:  Ideal Gas Law |
 60%
From NCERT
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Distribution of fraction of molecules with velocity is represented in the figure.

The velocity corresponding to point X is

1. 2RTM

2. 3RTM

3. 8RTπM

4. none of the above

Subtopic:  Molecular Velocity |
 63%
From NCERT
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A ballon having weight 50 kg is filled with 685.2 kg of helium gas at 760 mm pressure and 25°C. What will be its pay load if it displaces 5108 kg of air?

1. 4372.8 kg

2. 4392.6 kg

3. 4444.4 kg

4. 3482.9 kg

Subtopic:  Gas Laws |
From NCERT
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For non-zero value of force of attraction between gas molecules for larger volume, gas equation will be

1. PV=nRT-n2Va

2. PV=nRT+nbP

3. P=nRTV-b

4. PV = nRT 

Subtopic:  van der Waal’s Correction |
 66%
From NCERT
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Four rubber tubes are respectively filled with H2,He, N2 and O2. Which tube will be reinflated first?

1. H2 filled tube

2. N2 filled tube

3. He filled tube

4. O2 filled tube

 

Subtopic:  Graham's Law |
 73%
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A gas has the van der Waal constants, a =1.49 L2 atm mol-2 and b=0.04L mol-1. Its Boyle's temperature is nearly

1. 50 °C

2. 354°C

3. 454 K

4. 408 K

Subtopic:  Liquefaction of Gases & Liquid |
 65%
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One litre of gas A at 2 atm pressure at 27°C and two litres of gas B at 3 atm pressure at 127°C are mixed in a 4 litre vessel. The temperature of the mixture is maintained at 327°C. What is the total pressure of the gaseous mixture?

1. 3.93 atm

2. 3.25 atm

3. 4.25 atm

4. 6.25 atm

Subtopic:  Gas Laws |
 70%
From NCERT
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The root mean square velocity of one mole of a monoatomic gas having molar mass M is urms.

The relation between the average kinetic energy (E) of the gas and urmsis

1. Urms=(3E/2M)

2. Urms=(2E/3M)

3. Urms=(2E/M)

4. Urms=(E/3M)

Subtopic:  Molecular Velocity |
 64%
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At 100°C and 1 atm, if the density of liquid water is 1.0 g cm-3 and that of water vapour is 0.0006 g cm-3, then the volume occupied by water molecules is 1 litre of steam at that temperature

1. 6 CM3

2. 60 CM3

3. 0.6 CM3

4. 0.06 CM3

Subtopic:  Ideal Gas Law |
 66%
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