Dear student,

# At high temperature and low pressure , the Van der Waal's equation is reduced to Ideal gas equation. since the Vander Waal's equation can be written as:

At low pressure, V increases ( P and V are inversely proportional to each other) therefore the value of b ( correction in V will be negligible as V is high) and a/V2 ( V is as denominator so a/V will be very small) become negligible that modified the Vander Waals equation as:

PV  = nRT

Similarly,  at high T, V increases as V is directly proportional to T therfore the value of b and a/V2 become negligible that modified the Vander Waals equation as:

PV  = nRT

Hence option D is correct.

Regards.

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low pressure and at high temperature
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thanks Aishwarya
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