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Standard XII

Chemistry

Liquefaction of Gases and Critical Constants

A gas can be ...

Question

A gas can be liquefied at temperature T and pressure P provided :

T = T_{c} a n d P < P_{c}

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T < T_{c} a n d P > P_{c}

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T > T_{c} a n d P > P_{c}

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T > T_{c} a n d P < P_{c}

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Solution

The correct option is C $T < T_{c} a n d P > P_{c}$
A gas can be liquefied at temperature T and pressure P provided:

$T < T_{c} and P > P_{c}$

Thus when the temperature is below the critical temperature and the pressure is above critical pressure, a gas can be liquified.

Hence, option B is correct.

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Similar questions

Q. If

\frac{P}{P_{c}} = x

(reduced pressure),

\frac{V}{V_{c}} = y

(reduced volume) and

\frac{T}{T_{c}} = z

(reduced temperature), then,

Q. The vander waal's equation of corresponding states for 1 mole of gas is [where

P_{c} =

critical pressure,

T_{c} =

critical temperature,

V_{c} =

critical volume]

[π = \frac{P}{P_{c}}, ϕ = \frac{V}{V_{c}} a n d θ = \frac{T}{T_{c}}]

The critical temperature $(T_{c})$ and critical pressure $p_{c})$ of $C O_{2}$ are ${30.98}^{\circ} C$ and 73 atm respectively.Can $C O_{2}$ (g) be liquefied at $32^{\circ} C$ and 80 atm pressure?

Q. For a substance,

T_{C}

is roughly

1.6

times, the normal boiling point temperature

(T

K

) and

V_{C}

is usually about

2.7

times the normal boiling point molar volume. Find the normal boiling pressure at boiling point if

P_{C}

10 a t m

. (

P_{C}, V_{C}

and

T_{C}

are critical parameters).

Q. If

\frac{P}{P_{c}} = P_{r}, \frac{T}{T_{c}} = T_{r}, a n d \frac{V_{m}}{V_{m, c}} = V_{r}

where

P_{r}

is reduced pressure,

P_{c}

is critical pressure

T_{r}

is reduced temperature,

T_{c}

is critical temperature

V_{r}

is reduced volume,

V_{c}

is critical volume
then the equation of state (or van der Waals equation), only in terms of

P_{r}, T_{r}

and

V_{r}

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A gas can be liquefied at temperature T and pressure P provided :

The correct option is C T<TcandP>PcA gas can be liquefied at temperature T and pressure P provided:T<Tc and P>PcThus when the temperature is below the critical temperature and the pressure is above critical pressure, a gas can be liquified.Hence, option B is correct.