The sides of safety matches contain :

red phosphorus + sand powder

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P_{4} S_{3}

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C a_{3} (P O_{4}) +

glass pieces

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K C I O_{3}, K N O_{3}

sulphur + antimony

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Solution

The correct option is A $P_{4} S_{3}$
The compound $P_{4} S_{3}$ is used in matches. It reacts with oxygen to produce $P_{4} O_{10}$ and $S O_{2}$ .
$P_{4} S_{3} (s) + O_{2} (g) \to P_{4} O_{10} (s) + S O_{2} (g)$

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