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Q.

The volumes of two HCl solutions  A (0.5M) and B (0.1M) to be mixed for preparing 2 L of 0.2 M HCl are

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a

1.5 L of A + 0.5 L of B

b

0.75 L of A + 1.25 L of B

c

0.5 L of A + 1.5 L of B       

d

1 L of A + 1 L of B  

answer is A.

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Detailed Solution

M=M1V1+M2V2V

0.2 = 0.5V1+0.1(2-V1)2

on solving V1 = 0.5 lit, V2 = 1.5 lit

 V1 = volume of (A) HCl solution

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