The volume of 10N and 4N HCL requied to make 1L of 7N HCl are

Options

A. 0.50 L of 10 N HCl and 0.50 L of 4 N HCl
B. 0.60 L of 10 N HCl and 0.40 L of 4 N HCl
C. 0.80 L of 10 N HCl and 0.20 L of 4 N HCl
D. 0.75 L of 10 N HCl and 0.25 L of 4 N HCl

Answer

A

Explanation

`N_(1)V_(1) + N_(2)V_(2) = NV`
Where `V_(1) + V_(2) =1 L`
or `V_(2) = (1-V_(1))L`
`10 xx V_(1) + 4(1-V_(1)) = 1 xx 7`
`10 V_(1) + 4-4V_(1) =7`
`6V_(1) =3`
`V_(1) = 3/6 = 0.5` L
`V_(2) = 1-0.5 = 0.5 L`