A sealed tube containing phosphorus was weighed and heated carefully. After completion of the reaction, the tube was re-weighed under similar conditions. The weight of the tube will:

increases

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decreases

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remains same

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None of the above

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Solution

The correct option is B remains same
According to the law of conservation of mass, the total mass of reactants is equal to the total mass of products in a chemical reaction.

$P_{4} + 5 O_{2} \to P_{4} O_{10}$

As the tube is sealed, the total mass of reactants, $P_{4}$ and $O_{2}$ is equal to the total mass of product formed i.e., phosphorus pentaoxide.

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