Ncert Exercises & Solutions

Select the correct option based on statements below:

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

1.	Both (A) and (R) are true and (R) is the correct explanation of (A).
2.	Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.	(A) is true but (R) is false.
4.	(A) is false but (R) is true.

Hint: Molarity =

\frac{moles of solute}{volume of solution in litre}

Explanation:

Volume of solutions is a function of temperature and molarity depends on volume of solution. Hence, molarity of solution in liquid state changes with temperature.

Molarity =

\frac{moles of solute}{volumeof solution in litre}

Hence, assertion and reason both are correct statements and reason is correct explanation for assertion.

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