Hydrogen peroxide in aqueous solution decomposes on warming to gi… - Vidyadip

MCQ

Hydrogen peroxide in aqueous solution decomposes on warming to give oxygen according to the equation $2 H _2 O _2$ (aq) $\rightarrow 2 H _2 O ( l )+ O _2$ (g) under conditions where one mole of gas occupies $24 dm ^3, 100 cm^3$ of XM solution of $H _2 O _2$ produces $3 dm ^3$ of $O _2$. Thus X is:

A
0.25
B
2.5
C
0.5
D
1

✓

Answer

B. 2.5
Explanation:
$\begin{array}{l}\text { Mole of } O _2 \text { formed }=\frac{3}{24}=\frac{1}{8} \\ \therefore \text { Mole of } H _2 O _2=\frac{1}{8} \times 2=\frac{1}{4} \\ \therefore 100 \times X =\frac{1}{4} \times 1000(m \text { mole }= m \times V ) \\ \therefore X =2.5\end{array}$

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