Question

A salt which leaves black residue on heating is:
O A. Zinc nitrate
O B. copper carbonate
O C. lead nitrate
O D. calcium carbonate
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Answer 1

Answer:

copper carbonate

Explanation:

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Answer 2

Answer:

Copper sulphate

Explanation:

Copper sulphate is naturally found in the form of blue crystals, copper (ll) sulphate pentahydrate. When you heat copper sulphate pentahydrate it turns white as the water which is driven off by the heat. The white solid remaining is anhydrous copper sulphate. On further heating, it changes its colour into black