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Q.

When 20 ml of mixture of $O_{2}$ and $O_{3}$ is heated, the volume becomes 29 ml and disappears in alkaline pyragallol solution. What is the volume percent of $O_{2}$ in the original mixture?

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a

10%

b

18%

c

90%

d

2%

answer is B.

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Detailed Solution

Let volume of $O_{2} \to x$

volume of $O_{3} \to y$

$\begin{array}{ll} O_{3} ⟶ O_{2} \\ a a + 9 \end{array}$

POAC on O

$\begin{matrix} 3 a = 2 (a + 9) \\ a = 18 ml \end{matrix}$

% of $O_{2} = \frac{2}{20} \times 100 = 10 %$

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When 20 ml of mixture of O2and O3 is heated, the volume becomes 29 ml and disappears in alkaline pyragallol solution. What is the volume percent of O2 in the original mixture?