The molarity of a solution obtained by mixing $250 m l$ of $0.5 M H C l$ with $750 m l$ of $2 M H C l$ is:

1.8

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1.6

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0.8

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Solution

The correct option is B 1.6
No. of moles in $0.5 M$ solution of $250 m l H C l = 0.5 \times 250 = 125 m o l e s$
No. of moles in $2 M$ solution of $750 m l H C l = 2 \times 750 = 1500 m o l e s$

Total number of moles $= 1500 + 125 = 1625 m o l e s$

Total volume $= 250 + 750 = 1000 m l$

$∴$ Molarity of the resulting solution $= \frac{1625}{1000} = 1.6 M$

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