action of heat on the following compounds zinc nitrate copper nitrate lead nitrate
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When zinc nitrate crystals are strongly heated, zinc oxide white residue and brown vapors of nitrogen dioxide gas are formed.
When copper nitrate heated first heat losses the water molecule, on further heating it decomposes to give reddish brown gas Nitrogen dioxide and oxygen. The greenish blue crystals of copper nitrate will change to black residue of copper oxide and give reddish brown gas i.e., nitrogen dioxide on heating.
Lead nitrate crystals on strong heating decompose to form lead monoxide, nitrogen dioxide gas and oxygen gas.
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answer is copper nitrate
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