Describe the action of heat on the following compounds :
(a) Ammonium nitrate
(b) Ammonium nitrite
( c) Ammonium chloride.
(d) Ammonium dichromate
( e) Orthophosphoric acid
(f) Phosphrous acid
(g) Hypophosphorous acid
(h) Copper nitrate.

Explanation

### Step-by-Step Text Solution

**(a) Ammonium Nitrate (NH₄NO₃)**
When ammonium nitrate is heated, it decomposes non-explosively to produce nitrous oxide (N₂O) and water vapor (H₂O). The reaction can be represented as follows:
\[ \text{2 NH}_4\text{NO}_3 \rightarrow \text{N}_2\text{O} + 2 \text{H}_2\text{O} \]

**(b) Ammonium Nitrite (NH₄NO₂)**
Upon heating ammonium nitrite, it decomposes to form nitrogen gas (N₂) and water. The balanced equation for this reaction is:
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