Assertion :If in a solution, solute is $20$ % by weight, then it is $25$ % by the weight of the solvent. Reason: Solution also includes weight of solute and thus, pure solvent is $80$ g which contains $20$ g of solute.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
$20$ % by weight of solution means $100$ g of the solution contains $20$ g of solute. The mass of the solvent is $100 - 20 = 80 g$ .
The percentage by weight of solvent will be $\frac{20}{80} \times 100 = 25$ %.
Thus, both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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