Write two precautions that must be taken while studying the decomposition reaction, when the ferrous sulphate crystals are heated in a boiling tube?

Write two precautions that must be taken while studying the decomposition reaction, when the ferrous sulphate crystals are heated in a boiling tube?
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Answer. Keep your nose away from the gas like SO2 which is suffocative. Use tube holder to heat the test tube.
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