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Q)

How many g of KCl would have to be dissolved in $60\;g\; H_2O$ to give $20\%$ by weight of solution ?

$(a)\;15\;g \\ (b)\;1.5\;g \\(c)\;11.5\;g \\(d)\;31.5\;g$

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A)
$\%$ by weight =$\large\frac{Weight\; of\; solute}{Weight \;of \;solution } \times$$ 100$
Suppose the weight of solute =x
or $20 =\large\frac{x}{x+60} $$\times 100$
or $x= 15\;g$
Hence a is the correct answer.
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