Q.

 Molarity of a solution and molality of a solution both change with density. 

 The density of the solution changes when the percentage by mass of the solution changes.

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a

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

b

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

c

Both (A) and (R) are false

d

(A) is true but (R) is false

answer is A.

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Detailed Solution

Because density varies when the percentage of the solution's mass changes, both the molality and molarity of a solution change with density.

both Assertion and Reason are correct and the reason is the correct explanation of Assertion.

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 Molarity of a solution and molality of a solution both change with density.  The density of the solution changes when the percentage by mass of the solution changes.