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Q.

30 lit of oxygen is liberated at STP by the complete decomposition of a sample of 1 lit of H₂O₂. The molarity of that H₂O₂ solution is nearly

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a

0.893 M

b

1.785 M

c

2.678 M

d

3.572 M

answer is C.

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Detailed Solution

1 lit of H₂O₂ solution

xrightarrow{{;;Pr oduces;;}};

30lit of "O₂"

i.e.. The volume strength of the H₂O₂ solution is 30vol strength.

\\Molarity;=;frac{volume;strength}{11.2}\\M;=;frac{30}{11.2};=;2.678M

(OR)
2H₂O₂ → 2H₂O + O₂
2 x 34gr ------22.4 lit
?? -------30lit

frac{30times 2times 34}{22.4};=;91.078gr[W/V%]

\\M;=;frac{Wt}{MW};times;frac{1}{V(in;lit)}\\M;=;frac{91.07}{34};times ;frac{1}{1}

M = 2.678M

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