50 mL of 10 N `H_2SO_4`, 25 mL of 12 N HCl and 40 mL of 5 N `HNO_3` are mixed and the volume of the mixture is made 1000 mL by adding water. The normality of resulting solution will be

Options

A. 1 N
B. 2N
C. 9N
D. 4N

Answer

A

Explanation

`N_1V_1 + N_2V_2 + N_3V_3 = N(V_1 + V_2 + V_3)`
`50 x× 10 + 25 xx 12 +40 xx 5 = N(1000)`
`500 + 300 + 200 = N(1000) implies N=1`