5mL of `N HCI, 20 mL` of `N//2 H_(2)SO_(4)` and 30 mL of `N//3 HNO_(3)` are mixed together and volume made to one litre. The normality of the resulting solution is

Options

A. `N//5`
B. `N//10`
C. `N//20`
D. `N//40`

Answer

D

Explanation

`N_(1) V_(1) + N_(2) V_(2) + N_(3) V_(3) = N_(4) V_(4)`
`(V_(4) = V_(1) + V_(2) V_(3) + V_(4))` or
`V_(4) =` Final Volume `= 1 L -= 1000 mL`
`5 xx N + 20 xx (N)/(2) + 30 xx (N)/(3) = N_(A) xx 1000`
`:. N_(4) = (N)/(40)`