The volumes of `4N HCI` and `10 N HCI` required to make 1 litre of `6N HCI` are

Options

A. 0.75 litre of 4 N HCl and 0.25 litre of 10 N HCl
B. 0.25 litre of 4 N HCl and 0.75 litre of 10 N HCl
C. 0.67 litre of 4 N HCl and 0.33 litre of 10 N HCl
D. 0.80 litre of 4 N HCl and 0.20 litre of 10 N HCl

Answer

C

Explanation

Suppose x L of 4 N HCl are taken. Then 10 N HCl taken `=(1-x)L`. Applying
`N_(1)V_(1)+N_(2)V_(2)=N_(3)V_(3)`
`4 xx x+10(1-x)=6xx1`
`"or "6x=4" or "x=(4)/(6)=0.67L`