Question

The normality of 10 ml of a 20V H2O2 solution is?

Answer 1

20VH2O2 means that 1 litre of H2O2 solution would produce 20 litre of Oxygen.

2H2O2.....................>H2O+ O2

From the equation it is clear that 2 moles of H2O2 produce 1 mol of O2
But 20V H2O2 will produce 20 litre of oxygen for 1 litre of H2O2.
............................................⇒ (20litre/24.4litre) mol of oxygen liberated for 1 litre of H2O2
So in 1 litre solution of H2O2, moles of H2O2=2*moles of oxygen = (2*20/24.4) mol/litre=1.67M
n-factor of H2O2=2 
So, normality=Molarity*n-factor=1.67*2=3.34N

Answer 2

refer to the attachment
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