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 (K2MnO4), Manganese dioxide (MnO2), and Oxygen (O2). The chemical reaction can be written as:

   2KMnO4 → K2MnO4 + MnO2 + O2

2. Pb(NO3)2: When Lead nitrate is heated, it decomposes to form Lead oxide (PbO), Nitrogen dioxide (NO2), and Oxygen (O2). The chemical reaction can be written as:

   2Pb(NO3)2 → 2PbO + 4NO2 + O2

The other two salts, Ag2O (Silver oxide) and FeSO4 (Iron(II) sulfate), do not release oxygen when heated. Ag2O decomposes to form Silver and Oxygen, while FeSO4 decomposes to form Iron(III) oxide, Sulfur dioxide, and Sulfur trioxide.