5 ml of N HCl, 20 ml of 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

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N40

N10

N20

answer is A.

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Detailed Solution

NV=N1V1+N2V2+N3V3 OR N×1000=1×5+12×20+13×30 OR N=140

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