Four particles have velocities 1, 0, 2, 3 m/s. The root mean square of the particles is (in m/s)

(A) 3.5                                

(B) 3.5

(C) 1.5                                

(D) 14/3

Subtopic:  Molecular Velocity |
 72%
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Joule-Thomson expansion of an ideal gas is an

(1) Isothermal process                             

(2) Isobaric process

(3) Isoenthalpic process                           

(4) Ideal process

Subtopic:  Liquefaction of Gases & Liquid |
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The pressure-volume plot for an ideal gas at a given temperature has the form of a -

1. Straight line                               

2. Exponential curve

3. Rectangular hyperbola                 

4. U-shaped curve

Subtopic:  Gas Laws |
 73%
From NCERT
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The average, RMS and most probable velocities of gas molecules at STP increase in the order

(1) RMS < average velocity < most probable velocity

(2) Most probable velocity < average velocity < RMS

(3) Average velocity < RMS < most probable velocity

(4) RMS < most probable velocity < average velocity

Subtopic:  Molecular Velocity |
 80%
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Equal volumes of SO2 and He at a temperature T and pressure P are allowed to effuse through a hole. The rate of effusion of helium is

(1) Equal to the rate of effusion of SO2

(2) Four times the rate of effusion of SO2

(3) Half of the rate of effusion of SO2

(4) Twice the rate of effusion of SO2

Subtopic:  Graham's Law |
 84%
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Flask X is filled with 20 g of CH4 gas at 100 °C and another identical flask Y with 40 g O2 gas at the same temperature. The correct statement among the following is –

1. The pressure of the gases in the two flasks is identical

2. The pressure of CH4 in flask X is higher than that of O2 in flask Y

3. The pressure of CH4 in flask X is lower than that of O2 in flask Y

4. The pressure of CH4 in flask X is half that of O2 in flask Y

Subtopic:  Ideal Gas Law |
 76%
From NCERT
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A certain volume of argon gas (Mol. wt. = 40) requires 45 s to effuse through a hole at a certain pressure and temperature. The same volume of another gas of unknown molecular weight requires 60s to pass through the same hole under the same conditions of temperature and pressure. The molecular weight of the gas is

(1) 53                                 

(2) 35

(3) 71                                 

(4) 120

Subtopic:  Graham's Law |
 75%
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The rms speed of a gas molecules at temperature 27 K and pressure 1.5 bar is 1×104 cm/sec. If both temperature and pressure are raised three time, the rms speed of the gas will be

(A) 9 × 104 cm/sec                                 

(B) 3 × 104 cm/sec

(C) 3 × 104 cm/sec                               

(D) 1 × 104 cm/sec

Subtopic:  Molecular Velocity |
 71%
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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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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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