In which ratio of volumes 0.4 M HCl and 0.9 M HCl are to be mixed such that the concentration of the resultant solution becomes 0.7 M ?A. `4 : 9`B. `2 : 3`C. `3 : 2`D. `1 : 1`

In which ratio of volumes 0.4 M HCl and 0.9 M HCl are to be mixed such

1.	In which ratio of volumes 0.4 M HCl and 0.9 M HCl are to be mixed such that the concentration of the resultant solution becomes 0.7 M ?A. `4 : 9`B. `2 : 3`C. `3 : 2`D. `1 : 1`
Answer» Correct Answer - B Let the volume ratio = x : y a/c to question `0.7=(0.4x +0.9 y)/(x + y) rArr 0.7x + 0.7 y = 0.4 x + 0.9 y` `rArr 0.3x = 0.2 y rArr (x)/(y)=(0.2)/(0.3)rArr =(0.2)/(0.3)rArr (x)/(y)=2:3`

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In which ratio of volumes 0.4 M HCl and 0.9 M HCl are to be mixed such that the concentration of the resultant solution becomes 0.7 M ?A. `4 : 9`B. `2 : 3`C. `3 : 2`D. `1 : 1`

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