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Question

# Two solutions labelled as 3M HCl and 1M HCl are mixed in the ratio of x:y by volume and the molarity of mixture solution becomes 1.5 M. What is the molarity of the resulting solution if they are mixed in the ratio of y:x by volume ?

A
4 M
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B
3 M
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C
2 M
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D
2.5 M
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Solution

## The correct option is C 2.5 MResultant molarityM=M1V1+M2V2V1+V2Case I: when solution are mixed in the ratio of x:y by volume 1.5=3x+yx+yor, 3x+y=1.5x+1.5y1.5x=0.5yxy=13Case II: when solution are mixed in the ratio of y:x means 3:1.M=3×3+1×11=104=2.5

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