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Question

At relatively high pressure, vander waals' equation reduces to:

A
PV=RT
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B
PV=RT+aV
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C
PV=RT+Pb
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D
PV=RTaV2
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Solution

The correct option is A PV=RT+Pb
Van der waal equation is,
(P+an2V)(Vnb)=nRT .... for n moles of gas
For 1 mole, the equation becomes,
(P+aV)(Vb)=nRT
At highpressure, the Pcorrection= negligible but volume correction cannot be regarded as negligible
P(Vb)=RT or PVPb=RT
or PV=RT+Pb
So, option C is correct.

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