5mL of NHCl, 20 mL of N/2 H2SO4 and 30mL of N/3 HNO3 are mixed together and volume made one litre. The normality of the resulting solution is:

(a) N/5

(b) N/10

(c) N/20

(d) N/40

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Equivalent Weight & Normality

(d) M eq. of HCl = 5 x1 =5;

M eq. of H2SO4 = 20 x (1/2) = 10;

M eq.of HNO3 = 30 x (1/3) =10;

Thus, total M eq. of acid = 5+10+10=25

Total volume = 1000mL

Also M eq. = N x V,

N = 25/1000=1/40

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