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Heating copper nitrate crystals produces black copper oxide, reddish-brown nitrogen dioxide, and oxygen. This reaction is best classified as

Acombination
Bdisplacement
Cthermal decomposition
Dneutralization
Answer & Solution
Correct answer: C. thermal decomposition
A single compound, copper nitrate, breaks down into simpler substances on heating. Since heat causes the breakdown, it is a thermal decomposition reaction.
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