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On strong heating, which of the following nitrates decomposes to give the metal as the residue?

1. Copper nitrate
2. Manganese nitrate
3. Silver nitrate
4. Ferric nitrate

Correct answer: Silver nitrate

Solution

Nitrates of very unreactive (noble) metals decompose to the metal itself: 2AgNO3 -> 2Ag + 2NO2 + O2. Cu, Mn and Fe nitrates give the metal oxide, not the metal.

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