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Question

The srength of H2O2 is expressed in several ways like molarity, normality, %(w/V), volume strength, etc. The strength of 10 V means 1 volume of H2O2 on decomposition gives 10 volumes of oxygen at 1 atm and 273 K or 1 litre of H2O2 gives 10 litre of O2 at 1 atm and 273 K.
The decomposition of H2O2 is shown as under:
H2O2(aq)H2O(l)+12O2(g)
H2O2 can acts as oxidising as well as reducing agent, as oxidisng agent H2O2 converted into H2O and as reducing agent H2O2 converted into O2, both cases n-factor is 2.
,Normality of H2O2Solution=2×Molarity of H2O2 Solution
What is the percentage strength of 11.2 V H2O2?

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Solution

1 litre of H2O2(aq) provide 11.2 L of O2 at STP
Moles of O2=1.222.4=0.5nH2O2 required=0.5×2MH2O2=nH2O2Vsolution=1 M
Strength in percentage means how many grams H2O2 present per 100 mL
M=1 and Molecular weight of H2O2=34
34 g H2O2 present per litre of solution or 3.4 g H2O2 present per 100 mL of solution.

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