An unknown substance "A" on thermal decomposition produces "B" and "C".What is A, an element or compound. Give reason

Dear Student,

A is a compound because compound can undergo thermal decomposition to gives other compound while element on providing heat to them do not give anything. So A should be compound.

For example : Iron sulphate on heating gives ferric oxide, sulphur dioxide and sulphur trioxide.

    FeSO4 heat Fe2O3 +SO2+SO3


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