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Question

# The gas with the highest critical temperature isN2H2HeO2CO2

A
He
B
N2
C
O2
D
CO2
E
H2
Solution
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#### Critical temperature (T) is the measure of intermolecular forces of attraction. The order of the critical temperature of the given gases is asTc(K)CO2304.2K>O2(154.3K)>N2(126.2K)>H2(33.2K)>He(5.2K)

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Q1

Gases posses charcteristic critical temperature which depends upo the magnitude of intermolecular forces between the particles. Following are the critical temperatures of some gases.

GasesH2HeO2N2Critical temperature in Kelvin33.25.3154.3126

From the above data what would be the order of liquefaction of these gases? Start writing the order from the gas liquefying first

(a) H2,He,O2,N2 (b) He,O2,H2,N2

(c) N2,O2,He,H2, (d) O2,N2,H2,He

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Q2
Gases H2 He O2 N2
Critical temperature(K) 33.2 5.3 154.3 126
From the above data what whould be the order of liquefaction of these gases?
Start writing the order from the gas liquefying first.
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Q3
The Van der waal's constant 'a' for gases CH4,N2,NH3 and O2 are 2.25, 1.39, 4.17 and 1.3 L2 atm mol2 respectively. The gas which shows highest critical temperature is:
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Q4
The values of critical pressures (Pc) and critical temperature (Tc) for O2,Cl2,H2 and he are given below The gas which has smallest value of van der Waal's constant 'b' is:

 Name of the gas Pc(Nm−2) Tc(K) O2 5×10∘ 153 Cl2 8×10∘ 412 H2 1×10∘ 33.9 He 2×10∘ 5.12

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Q5
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