Assertion :The lowest hypothetical or imaginary temperature at which gases are supposed to occupy zero volume is called absolute zero. Reason: Volume of the gas at $- {273.15}^{\circ} C$ becomes zero i.e. gas does not exist at this temperature.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The lowest hypothetical or imaginary temperature at which gases are supposed to occupy zero volume is called absolute zero.
$T (K) = t (C) + 273.15 O K = - 273.15 ° C + 273.15$
$⟹$ Volume of gas at $- 273.15 ° C$ becomes zero. i.e. gas doesn't exist at this temperature. (at zero kelvin, the motion of fluids is also zero, ACC to brownian)

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Assertion :The lowest hypothetical or imaginary temperature at which gases are supposed to occupy zero volume is called absolute zero. Reason: Volume of the gas at −273.15∘C becomes zero i.e. gas does not exist at this temperature.

Assertion :The lowest hypothetical or imaginary temperature at which gases are supposed to occupy zero volume is called absolute zero. Reason: Volume of the gas at $- {273.15}^{\circ} C$ becomes zero i.e. gas does not exist at this temperature.