The volume of 10 N and 4 N HCl required to make 1L of 6N HCl are :

Options

A. 0.75 L of 10 N HCl and 0.25 L of 4 N HCl
B. 0.80 L of 10 N HCl and 0.20 L of 4 N HCl
C. 0.33 L of 10 N HCl and 0.67 L of 4 N HCl
D. 0.5 L of 10 N HCl and 0.5 L of 4 N HCl.

Answer

C

Explanation

Let volume of 10N needed `=x`
Volume of 4N HCl needed `=1-x`
Now `10xx x +4(1-x)=6xx1`
`10x+4-4x=6`
`6x=2 " or " x=2//6=0.33L`
Volume of 10N HCl `=0.33L`
Volume of 4N HCl `=1-0.33=0.67L`