Correct Answer: Option C

Explanation

When heated, the nitrates of potassium, magnesium, and iron decompose as follows:

- Potassium nitrate (KNO₃) decomposes to potassium nitrite (KNO₂) and oxygen (O₂).

- Magnesium nitrate (Mg(NO₃)₂) decomposes to magnesium oxide (MgO) and nitrogen dioxide (NO₂) and oxygen (O₂).

- Iron(III) nitrate (Fe(NO₃)₃) decomposes to iron(III) oxide (Fe₂O₃) and nitrogen dioxide (NO₂) and oxygen (O₂).

So, all three nitrates would not decompose to their respective oxides except Nitrates of Magnesium and Iron.

The correct answer is  C. 

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