Which one of the following chemical reaction is NOT suitable in the school laboratory to verify the law of conservation of mass:
a) Mixing Hydrochloric acid and Sodium hydroxide solutions
b) Mixing Potassium iodine and Lead nitrate solutions
c) Thermal decomposition of Potassium chlorate.

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Solution

Option C, thermal decomposition of KClO₃ as it releases oxygen gas. It is difficult to collect all the gas and find its mass.

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Which one of the following chemical reaction is NOT suitable in the school laboratory to verify the law of conservation of mass: a) Mixing Hydrochloric acid and Sodium hydroxide solutions b) Mixing Potassium iodine and Lead nitrate solutions c) Thermal decomposition of Potassium chlorate.

Option C, thermal decomposition of KClO3 as it releases oxygen gas. It is difficult to collect all the gas and find its mass.

Which one of the following chemical reaction is NOT suitable in the school laboratory to verify the law of conservation of mass:
a) Mixing Hydrochloric acid and Sodium hydroxide solutions
b) Mixing Potassium iodine and Lead nitrate solutions
c) Thermal decomposition of Potassium chlorate.

Option C, thermal decomposition of KClO₃ as it releases oxygen gas. It is difficult to collect all the gas and find its mass.