Question

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

(a) N/5

(b) N/10

(c) N/20

(d) N/40

Answer 1

Correct option is (d) N/40

NV = N₁V₁ + N₂V₂ + N₃V₃

N × 1000 = 1 × 5 + \(\frac 12\) × 20 + \(\frac 13\) × 30

= 5 + 10 + 10

= 25

N = 0.025 = \(\frac N{40}\)