The mean free path ($\mathrm{\lambda }$) of a gas sample is given by:

(a) $\lambda =\sqrt{2}\pi {\sigma }^{2}N$                                (b) $\lambda =1/\sqrt{2}\pi {\sigma }^{2}N$

(c) $\lambda =\sqrt{2}\pi \mu {\sigma }^{2}N$                               (d) none of these

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Which is lighter than dry air?

(a) Moist air                              (b) SO2

(c) Cl2                                      (d) O2

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The ratio a/b (the terms used in van der Waals' equation) has the unit:

(a) atm lire mol-1                             (b) atm dm3 mol-1

(c) dyne cm mol-1                            (d) all of these

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In the vander Waals' equation, the constant 'a' and 'b' with temperature shows which trend:

(a) both remains same

(b) 'a' remains same, 'b' varies

(c) 'a' varies, 'b' remains same

(d) both varies

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At relatively high pressure, van der Waals' equation reduces to:

(a) PV = RT

(b) PV = RT + a/v

(c) PV = RT + Pb

(d) PV = RT - a/V2

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When is the deviation more in the behaviour of a gas from the ideal gas equation pV=nRT?

(a) AT high temperature and low pressure

(b) At low temperature and high pressure

(c) At high temperature and high pressure

(d) At low temperature and low pressure

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Joule-Thomson coefficient ($\partial \mathrm{T}/\partial \mathrm{P}$)H for an ideal gas is:

(a) zero                                  (b) +ve

(c) -ve                                    (d) none of these

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All the three states H2O, i.e., the triple point for H2O the equilibrium,

Ice $⇌$Water$⇌$Vapour exist at:

(a) 3.85 mm and 0.0981 $°$C

(b) 4.58 mm and 0.0098 $°$C

(c) 760 mm and 0$°$C

(d) none of the above

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The unit of van der Waals' constant 'a' is:

(a) atm litre2 mol-2                        (b) dyne cm4 mol-2

(c) newton m4 mol-2                     (d) all of these

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The unit of van der Waals' constant 'b' is :

(a) cm3 mol-1

(b) litre mol-1

(c) m3 mol-1

(d) all of these