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10 volume solution of H2O2 means that 1L of this H2O2 will give 10 L of oxygen at STP 

2H2 O2 ( l) → O2( g) +2 H2O( l) 

2×34 g       22.4 L at STP 

22.4 L of O2 at STP is produced from H2O2 = 68 g 

20 L of O2 at STP is produced from H2O2 =68X20/22.4 = 60.72 g

Therefore, strength of H2O2 in 20 volume H2O2 = 60.72 g/L

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