`A+dil.H_(2)SO_(4)overset(Delta)to gas(B)`. Gas(B) turns `K_(2)Cr_(2)O_(7)//H` solution green.
Aq.solution of `A+BaCl_(2)to White ppt.(C)`
Identify(A),(B) and ©

Explanation

To solve the problem, we need to identify the compounds A, B, and C based on the given reactions and observations. Let's break down the information step by step.

### Step 1: Identify Compound A
The problem states that compound A reacts with dilute H₂SO₄ when heated to produce gas B.

From the video transcript, we learn that gas B turns K₂Cr₂O₇ in acidic solution green, indicating a reduction of chromium from +6 to +3 oxidation state. This suggests that gas B is likely sulfur dioxide (SO₂), which is produced from the decomposition of sulfur compounds.

Given that SO₂ can be formed from sulfite ions (SO₃²⁻) or sulfate ions (SO₄²⁻) in the presence of an acid, we can deduce that compound A is a mixture of sulfite and sulfate ions. Therefore, we can conclude:
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