Assertion :The normal boiling point of water is $100^{\circ} C$ and standard boiling point of water is ${99.6}^{\circ} C$ . Reason: The temperature at which vapour pressure of liquid is equal to the external pressure is called boiling temperature at that pressure.

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 B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
At $1 a t m$ pressure, boiling temperature is called normal boiling point and if pressure is $1 b a r$ then the boiling point is called standard boiling point of the liquid. $1 b a r$ pressure is slightly less than $1 a t m$ pressure therefore, standard boiling point of the liquid is slightly lower than the normal boiling point.

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In the following question a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below in each question.

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Assertion :The normal boiling point of water is 100∘C and standard boiling point of water is 99.6∘C. Reason: The temperature at which vapour pressure of liquid is equal to the external pressure is called boiling temperature at that pressure.

Assertion :The normal boiling point of water is $100^{\circ} C$ and standard boiling point of water is ${99.6}^{\circ} C$ . Reason: The temperature at which vapour pressure of liquid is equal to the external pressure is called boiling temperature at that pressure.