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Question

1 M HCl and 2 M HCl are mixed in volume ratio of 4:1. The resulting HCl solution is diluted to double its original volume. What is the final molarity of HCl solution?

A
0.75 M
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B
1.2 M
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C
0.6 M
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D
1.5 M
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Solution

The correct option is C 0.6 M
Let volume of 1 M HCl solution is 4V Litres and 2 M HCl solution is V Litres. Then, molarity after mixing can be given as,
M=M1×V1+M2×V2V
where, M and V are molarity and volume of solution mixture,
V1 and V2 are 4V and V respectively.
So, M=1×4V+2×V4V+V=1.2 M

Now, final volume is doubled after dilution, So final volume(Vf)=2V=10V
Mf=M×VVf=0.6M

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