Assertion (A) Molarity of a solution in liquid state changes with temperature.
Reason (R) The volume of a solution changes with change in temperature.

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Solution

(a) Assertion and reason both are correct satements and reason is the correct explanation of assertion.
Volume of solutions is a function of temperature which varies with temperature. Hence, molarity of solution in liquid sate changes with temperature.
Molarity = $\frac{m o l e s o f s o l u t e}{v o l u m e o f s o l u t i o n i n l i t r e}$

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Assertion (A) Molarity of a solution in liquid state changes with temperature. Reason (R) The volume of a solution changes with change in temperature.

Assertion (A) Molarity of a solution in liquid state changes with temperature.
Reason (R) The volume of a solution changes with change in temperature.