Assertion: At critical point the densities of substance in gaseous and liquid states are same.
Reason: Critical temperature is the temperature at which the real gas exhibit ideal behaviour for considerable range of pressure.

Both assertion and reason are true and reason is the correct explanation of assertion.

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Both assertion and reason are true but reason is not the correct explanation of assertion.

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Assertion is true but reason is false.

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Both assertion and reason are false.

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Solution

The correct option is C Assertion is true but reason is false.
Temperature at which the real gas exhibits ideal behaviour for considerable range of pressure is known as Boyle's temperature. $T_{b} = \frac{a}{b R}$
Where, a and b are van der Waals constants.
Critical temperature is the temperalure above which the gas cannot be liquified, how so ever high pressure may be applied:
$T_{c} = \frac{8 a}{27 R b}$
At the critical point, the densities of substance in gaseous and liquid state are same.
Hence, option (c) is correct.

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are very different in their behaviour at any temperature and pressure but their compressibility factors are nearly the same at the critical point. Reason: They have nearly the same critical constant.

Q. Assertion (A): Real gases tend to behave as ideal gas at low pressure and high Temperature.
Reason (R): At temperature more than critical temperature, a gas can’t be liquefied just by increasing the pressure. Which of the followings is correct?

Consider the following statements.

I. Gaseous substances whose critical temperatures are above room temperatures can be liquefied by applying sufficient pressure to the gas.

II. Gaseous substances whose critical temperatures are below room temperature can be liquefied by the application of pressure and lowering of temperature below $T_{c}$ .

Select the correct alternate.

Consider the following statements.

I. Gaseous substances whose critical temperatures are above room temperatures can be liquefied by applying sufficient pressure to the gas.

II. Gaseous substances whose critical temperatures are below room temperature can be liquefied by the application of pressure and lowering of temperature below $T_{c}$ .

Select the correct alternate.

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Assertion: At critical point the densities of substance in gaseous and liquid states are same. Reason: Critical temperature is the temperature at which the real gas exhibit ideal behaviour for considerable range of pressure.

Assertion: At critical point the densities of substance in gaseous and liquid states are same.
Reason: Critical temperature is the temperature at which the real gas exhibit ideal behaviour for considerable range of pressure.