In case of hydrogen and helium the van der Waals' forces are:

(a) strong                 (b) very strong

(c) weak                   (d) none of these

Concept Questions :-

Vanderwaal Correction
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With increase of pressure, the mean free path:

(a) decreases                             (b) increases

(c) becomes zero                        (d) remains same

Concept Questions :-

Kinetic Theory of Gas
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Which gas when passed through dilute blood will impart a cherry red colour to the solution?

(a) CO2                               (b) COCl2

(c) NH3                               (d) CO

Concept Questions :-

Introduction to States of Matter
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The compressibility factor of a gas is defined Z=PV/nRT. The compressibility factor of an ideal gas is:

(a) zero                          (b) infinite

(c) 1                               (d) -1

Concept Questions :-

Compressibility Factor
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The correct value of the gas constant 'R' is close to 

(a) 0.082 L atm K

(b) 0.082 L atm K-1 mol-1

(c) 0.082 L atm-1 K mol-1

(d) 0.082 L-1 atm-1 K mol

Concept Questions :-

Ideal Gas Law
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The partial pressure of a dry gas is:

(a) less than that of wet gas

(b) greater than that of wet gas

(c) equal to that of wet gas

(d) none of the above

Concept Questions :-

Dalton's Law
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The number of molecules present in 1 mL of gas or vapour at STP is:

(a) called Loschmidt's number

(b) equal to 2.617 x 1019 per mL

(c) both (a) and (b)

(d) none of the above

Concept Questions :-

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 Air at sea level is dense. This is a practical application of:

(a) Boyle's law                         (b) Charles' law

(c) Avogadro's law                    (d) Dalton's law

Concept Questions :-

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In van der Waals' equation of state of the gas, the constant 'b' is a measure of:

(a) intermolecular collisions per unit volume

(b) intermolecular attraction

(c) volume occupied by molecules

(d) intermolecular repulsions

Concept Questions :-

Vanderwaal Correction
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For 1 mole of gas, the average kinetic energy is given as E. The urms of gas is :

(a) [2E/M]1/2

(b) [3E/M]1/2

(c) [2E/3M]1/2

(d) [3E/2M]1/2

Concept Questions :-

Molecular Velocity
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