The rate of effusion of helium gas at a pressure of 1000 torr is 10 torr min–1 What will be the rate of effusion of hydrogen gas at a pressure of 2000 torr at the same temperature?

(A) 20 torr min1                             

(B) 40 torr min1

(C) 202 torr min1                        

(D) 10 torr min1

Subtopic:  Graham's Law |
 64%
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NEET 2023 - Target Batch - Aryan Raj Singh
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The van der waals' constants for a gas are : a = 4 lit2 atm mol2, b = 0.04 lit mol1. lts Boyle temperature is roughly

(1) 1000C                        

(2) 1220 K

(3) 12200C                       

(4) 1600 K

Subtopic:  van der Waal’s Correction |
 70%
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Choose the correct statement for viscosity (η) variation with T and P for an ideal gas-

1. η of a gas increases with increase in temperature (T), but it is independent of pressure

2. η of a gas decreases with increase in T and increases with increase in P

3. η of a gas is independent of temperature and pressure

4. η of a gas increases with increase in both T and P

Subtopic:  Liquefaction of Gases & Liquid |
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Since the atomic weights of C, N and O are 12, 14 and 16 respectively, among the following pair, the pair that will diffuse at the same rate is-

(1) Carbon dioxide and nitrous oxide

(2) Carbon dioxide and nitrogen peroxide

(3) Carbon dioxide and carbon monoxide

(4) Nitrous oxide and nitrogen peroxide

Subtopic:  Graham's Law |
 67%
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Oxygen is present in 1-litre flask at a pressure of 7.6× 1010 mmHg.The number of oxygen molecules in the flask at 0 ºC is -

1. 2.686 × 1010                            

2. 26.86 × 1010

3. 0.626 × 1012                            

4. 4.123 × 108

Subtopic:  Ideal Gas Law |
 60%
From NCERT
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The critical temperature and critical pressure of a gas obeying van der Waals’ equation are 30ºC and 73 atm respectively. Its van der Waals’ constant, b in litres mol-1 is, therefore

1. 0.500                                 

2. 0.060

3. 0.265                                 

4. 0.043

Subtopic:  Liquefaction of Gases & Liquid |
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A closed vessel contains equal number of oxygen and hydrogen molecules. Consider the following statements:

1. The average speed of hydrogen molecules is greater.

2. The two gases have different average energies.

3. Hydrogen molecules strike the walls more often.

4. Weight of hydrogen is 18th of the weight of oxygen.

Wrong statements are –

(A) 1 and 2                       

(B) 2 and 3

(C) 1 and 3                       

(D) 2 and 4

Subtopic:  Kinetic Theory of Gas |
 57%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

SO3(g) decomposes according to the equation

2SO3g             2SO2g+O2g

A sealed container contains 0.5 mol of SO3 gas at 100°C and 2 atm pressure. What would be the pressure in the container if the SO3 gas is decomposed completely according to the above equation and the temperature were maintained at 100°C –

(A) 0.5 atm                             

(B) 1.0 atm

(C) 2.0 atm                             

(D) 3.0 atm

Subtopic:  Ideal Gas Law |
 52%
From NCERT
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A general form of equation of state for gases is PV=RT A+BV+CV2+........, where V is the molar volume of the gas and A, B, C, ........... are constant for the gas. The values of A and B, if the gas obeys van der Waals' equation, are respectively.

(1) aRT, b                                     

(2) 2aRT, b

(3) 1, b-aRT                               

(4) 1, a27 b

Subtopic:  van der Waal’s Correction |
 55%
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The mean free path of gas A, with molecular diameter equal to 4 Å, contained in a vessel, at a pressure of 106 torr, is 6990 cm. The vessel is evacuated and then filled with gas B, with molecular diameter, equal to 2 Å, at a pressure of 103 torr, the temperature remaining the same. The mean free path of gas B will be

(A) 28 cm                       

(B) 280 cm

(C) 7 cm                         

(D) 14 cm

Subtopic:  Kinetic Theory of Gas |
 53%
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