245 gram of $K C l O_{3}$ on decomposition produce 2.4 gram of $O_{2}$ .What is % purity of $K C l O_{3}$ ?

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2.5 %

4 %

5 %

7 %

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Detailed Solution

Gram molecular weight of $K C l O_{3} = 39 + 35.5 + 48 = 122.5 g r a m / m o l e$

$2 K C l O_{3} \to 2 K C l + 3 O_{2}$

According to equation 245 gram of $K C l O_{3}$ should produce $3 \times 32 = 96 g r a m o f O_{2}$ if $K C l O_{3}$ is 100 % pure.

96 gm of $O_{2}$ is produced when $K C l O_{3}$ is 100 percent pure.

When 2.4 gm of $O_{2}$ is produced , the percentage purity is $\frac{100}{96} \times 2.4 = 2.5$

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