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Which of the following statement (s) is ...

Which of the following statement `(s)` is true
`I-` Slpe of isotherm at critical point is maximum
`II -` Larger is the value of `T_(C)` easier is the liquification of gas.
`III-` Vander walls equation of state is applicable below critical temperature at all pressure.

A

only I

B

I & II

C

II & III

D

only II

Text Solution

Verified by Experts

The correct Answer is:
B
I- Slope of isotherm below critical point `lt 0`.
Slope of isotherm above critical point `lt 0`.
Slope of isotherm at critical point `= 0`.
So. Slope of isotherm at critical point is maximum.
II - `T_(c) = (8a)/(27Rb)`
`T_(c) prop a`
Larger value of `T_(c)` it means less decreases in temperature is required to liquify the gas. Gas will liquify at higher temperature. So, easier'II be liquification.
III -When gas is below critical temperature. It is "liquid" so vander waal equation of state is not valid.
So, Answer (B)
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