The products of oxidation of phosphorus acid by hot concentrated sulphuric acid are ...........and ............. .

Explanation

To solve the question regarding the products of oxidation of phosphorus acid (H₃PO₃) by hot concentrated sulfuric acid (H₂SO₄), we can follow these steps:

### Step 1: Identify the Reactants
The reactants in this reaction are phosphorus acid (H₃PO₃) and hot concentrated sulfuric acid (H₂SO₄).

**Hint:** Always start by identifying the substances involved in the reaction.

### Step 2: Understand the Reaction Type
...