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  • Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : At <img alt="

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : At 10^{\circ} \mathrm{C}$, the density of a $5 \mathrm{M}$ solution of $\mathrm{KCl} [atomic masses of \mathrm{K} \mathrm{\&} \mathrm{} \mathrm{Cl}$ are $39 \& 35.5 \mathrm{~g} \mathrm{~mol}^{-1} respectively], is ' x$ ' $\mathrm{g} \mathrm{ml}^{-1}. The solution is cooled to \mathrm-21^{\circ}{C}. The molality of the solution will remain unchanged.

Reason (R): The molality of a solution does not change with temperature as mass remains unaffected with temperature.
In the light of the above statements, choose the correct answer from the options given below.

Option: 1

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


Option: 2

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


Option: 3

(A) is true but (R) is false.


Option: 4

(A) is false but (R) is true.


Answers (1)

best_answer

The temperature does not change the mass of the solute or the solvent and hence, the molality of solution remains the same.

 Hence both Assertion and Reason are true and the Reason correctly explains the Assertion.

Hence , the correct answer is Option (1).

Posted by

Nehul

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