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56V,500mlH2O2 solution is kept in an ope...

56V,500ml`H_2O_2` solution is kept in an open contaier due to which some `H_2O_2` is decomposed and evolves 8gm `O_2`. Simultaneously some `H_2O` also vapouries. Due to all these changes ,final volume is reduced by `20%`. Find final volume strength of `H_2O_2(aq)`.
Assume 1 mole of an ideal gas occupies 22.4 L at STP)

A

56 V

B

44.8 V

C

11.2 V

D

33.6 V

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A
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