For one mole of van der Waals gas, the compressibility factorZ=(\frac{PV }{RT}) at a fixed volume will certainly decreases if [Given: ''a'', ''b'' are standard parameters for van der Waals gas]

Correct Answer is : ''b'' decreases and ''a'' increases at constant temperature

''b'' increases and ''a'' decreases at constant temperature

''b'' decreases and ''a'' increases at constant temperature

temperature increases at constant ''a'' and ''b'' values

''b'' increases at constant ''a'' and temperature

KVPY 2019 SA Exam Previous Papers

Question : 72 of 80

Marks: +1, -0

For one mole of van der Waals gas, the compressibility factor

Z=({PV }/{RT})

at a fixed volume will certainly decreases if
[Given: ''a'', ''b'' are standard parameters for van der Waals gas]

Solution:

Van -der walls goes eauation for n = 1

(P+a/V^2_m)(V_m -b) = RT

Compressibility factor (z) decreases if (b) decreases (a) increases at constant temperature.

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