The volume of water required to make $0.20$ M solution from $16$ ml of $0.5$ M solution is:

40 ml

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16 ml

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50 ml

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24 ml

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Solution

The correct option is B 24 ml
The relationship between the molarity and volume is, $M_{1} \times V_{1} = M_{2} \times V_{2}$ .

Substituting values in the above expression,

$0.5 M \times 16 m l = 0.20 M \times V_{2}$

Hence, $V_{2} = 40 m l$

Hence, the volume of water required to make $0.20$ M solution from $16$ ml of $0.5$ M solution is $40 m l - 16 m l = 24 m l$ .

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