Which of the following salt(s) when heated give(s) oxygen?KMnO4Ag2OPb(NO3)2FeSO4

The salts that give oxygen when heated are KMnO4 (Potassium permanganate) and Pb(NO3)2 (Lead nitrate).

Here's why:

1. KMnO4: When Potassium permanganate is heated, it decomposes to form Potassium manganate, Manganese dioxide, and Oxygen. The chemical reaction is as follows:

   2KMnO4 → K2MnO4 + MnO2 + O2

2. Pb(NO3)2: When Lead nitrate is heated, it decomposes to form Lead oxide, Nitrogen dioxide, and Oxygen. The chemical reaction is as follows:

   2Pb(NO3)2 → 2PbO + 4NO2 + O2

On the other hand, Ag2O (Silver oxide) and FeSO4 (Iron(II) sulfate) do not release oxygen when heated. Ag2O decomposes to form Silver and Oxygen, but this reaction requires a very high temperature (around 200°C). FeSO4 decomposes to form Iron(III) oxide, Sulfur dioxide, and Sulfur trioxide, but no Oxygen.