At critical point in Andrews isotherm which of the following is a correct statement:

Liquid - vapor equilibrium exist

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Substance may change from liquid to gas phase

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Substance may change from gas to liquid phase

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All of the above

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Solution

The correct option is D All of the above
At critical point in Andrews isotherm, the liquid state and the gaseous state are almost indistinguishable from each other. An equilibrium is established between liquid state and gaseous state.
The liquid state may change into gaseous state and the gaseous state may change into liquid state.

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I :

T_{c} / p_{c}

I I :

(T_{c})

(T_{b})

I I I :

(\frac{δ p}{δ V_{m}}) T_{c} = 0

T_{c}

Which of the following statements on critical constants of gases are correct?

I : Larger the $\frac{T_{c}}{P_{c}}$ value of a gas, larger would be the excluded volume.

II : Critical temperature ( $T_{c}$ ) of a gas is greater than its Boyle's temperature ( $T_{B}$ ).

III : At the critical point in the Van der Walls gas isotherm.

$⟮ \frac{d P}{d V_{m}} ⟯ T_{c} = 0$

T_{c}

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