NEET Practice Questions (MCQs) with Answers & Solutions

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

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Explanation

(b) Gases show deviation from ideal gas behaviour when the temperature is low and pressure is high. At low temperature, the volume of one molecule is not negligible in comparison to total volume and intermolecular force of attraction is maximum at low temperature and high pressure.

Joule-Thomson coefficient (T/P)H for an ideal gas is:

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Explanation

(a) Ideal gas does not show Joule-Thomson effect.

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

                       Ice WaterVapour exist at:

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Explanation

(b) The conditions for triple point of H2O.

 

the particular temperature and pressure at which the solid, liquid, and gaseous phases of a given substance are all at equilibrium with one another.

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

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Explanation

(d) a=P x V2 = atm litre2 mol-2 = dyne cm4 mol-2 = Newton m4 mol-2 = atm dm6 mol-2

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

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Explanation

(d) b = 4Nv;   unit of b = litre mol-1 = cm3 mol-1 = m3 mol-1

At STP, 0.50 mole H2 gas and 1.0 mole He gas                                  

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The beans are cooked earlier in pressure cooker, because                                     

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Explanation

(a)

The beans are cooked earlier in the pressure cooker because the boiling point increases with increasing pressure.

An ideal gas cannot be liquefied because                                          

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Explanation

(d) Gases can be liquefied by lowering the temperature and increasing the pressure. An ideal gas have no intermolecular force of attraction, so it cannot be liquefied by applying high pressure and decreasing temperature.

 The compressibility factor for H2 and He is usually:

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Explanation

(a) For H2 and He, PV > nRT; Also Z = PV/nRT .

Boyle's law is applicable in :

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Explanation

(c) A constant temperature refers for isothermal process.

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