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Standard XII

Chemistry

Liquefaction of Gases and Critical Constants

Assertion A:T...

Question

Assertion (A):The temperature at which vapour pressure of a liquid equal to the external pressure is called boiling temperature.
Reason (R): At high altitude atmospheric pressure is high.

Both A and R are true and R is the correct explanation of A.

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Both A and R are true but R is not the correct explanation of A.

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A is true but R is false.

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A is false but R is true.

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Solution

The correct option is C A is true but R is false.
The temperature at which the vapour pressure of a liquid becomes equal to the external pressure or atmospheric pressure is called its boiling point. Atmospheric pressure decreases with increase in altitude, so atmospheric pressure is low at altitude.
Thus, assertion is true and reason is false.

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Similar questions

Q. Assertion (A):The temperature at which vapour pressure of a liquid equal to the external pressure is called boiling temperature.
Reason (R): At high altitude atmospheric pressure is high.

Q. Assertion :At high altitudes, liquids boil at lower temperatures in comparison to that at sea level. Reason: At high altitudes, atmospheric pressure is low.

Q. 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.

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.

Assertion (A) The temperature at which vapour pressure of a liquid is equal to the external pressure is called boiling temperature.

Reason (R) At high altitude atmospheric pressure is high.

(a) Both A and R are true and R is the correct explanation of A

(b) Both A and R are true but R is the correct explanation of A

(d) A is false but R is true.

Q. Assertion :At high altitudes the boiling point of water is low. Reason: At high altitudes atmospheric pressure is low.

Choose the correct option.

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Liquefaction of Gases and Critical Constants

Standard XII Chemistry

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Assertion (A):The temperature at which vapour pressure of a liquid equal to the external pressure is called boiling temperature. Reason (R): At high altitude atmospheric pressure is high.

Assertion (A):The temperature at which vapour pressure of a liquid equal to the external pressure is called boiling temperature.
Reason (R): At high altitude atmospheric pressure is high.