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Question

Assertion (A): Molality of solution does not change with change in temperature.
Reason (R): Molality is defined as no. of moles of solute per kg of solvent. Which of the following is correct?

A
Both A and R are true and R is correct explanation of A
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B
Both A and R are true and R is not a correct explanation of A
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C
A is true but R is false.
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D
A is false but R is true.
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Solution

The correct option is B Both A and R are true and R is not a correct explanation of A

Molality does not change with change in temperature, because it is defined as no.of.moles of solutewt.of solvent in kg . Neither no. of moles nor the wt. of solvent is changing with change in temperature. Hence (b) is the correct option.


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