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5 ml of 1 N HCl, 20 ml of N/2 H₂SO₄ and 30 ml of N/3 HNO₃ are mixed together and the volume made to one litre. The normality of the resulting solution is

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N/40

N/10

N/5

N/20

answer is D.

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Detailed Solution

$N_{mix .} = \frac{V_{1} N_{1} + V_{2} N_{2} + V_{3} N_{3}}{V} = \frac{(5 \times 1) + (20 \times 1 / 2) + (30 \times 1 / 3)}{1000} = \frac{N}{40}$

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