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The critical pressure P(C) and critical ...

The critical pressure `P_(C)` and critical temperature `T_(C)` for a gas obeying van der Waal's equation are 80 atm at `87^(@)`C. molar mass of the gas is 130 g/mole. The compressibility factor for the above gas will be smaller than unity under the following condition:

A

1 atm and `800^(@)C`

B

1 atm and `1200^(@)`

C

1 atm and `1000^(@)C`

D

1 atm and `1100^(@)C`

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The correct Answer is:
a
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