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Q.

Hydrogen peroxide in aqueous solution decomposes on warming to give oxygen according to the equation

2H2O2(aq)⟶2H2O(l)+O2(g)

24dm3⋅100cm3 of X M solution of H2O2 produces 3 dm3 of O2 • Thus, X is :

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a

0.5 

b

0.25

c

1

d

2.5 

answer is A.

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Detailed Solution

Here,

24 dm3→1 mole of O2 gas. 

3 dm3→324=18 mole of O2 gas 

2H2O2→2H2O+O2

nH2O2=2×nO2=2×18=14 moles 

∴X×0.1=0.25  ⇒X=2.5

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