`underset("(B) white fumes")underset(darr)(MCl_(4)"(colourless liquid) M = transition metal moist air") overset(Zn+H_(2)O)(rarr) underset((A))("Purple coloured compound")`
Identify (A), (B) and `MCl_(4)` . Also explain colour differnece between `MCl_(4)` and (A) .

Explanation

To solve the given problem, we need to identify (A), (B), and \( MCl_4 \) based on the information provided. Let's break it down step by step.

### Step 1: Identify (B) - the White Fumes
The question states that when \( MCl_4 \) is exposed to moist air, it produces white fumes. The white fumes are typically associated with hydrochloric acid (HCl), which is produced when metal chlorides react with moisture in the air. Therefore, we can conclude:
- **(B) = HCl (hydrochloric acid)**

### Step 2: Identify \( MCl_4 \)
Next, we need to identify \( MCl_4 \). The problem states that \( M \) is a transition metal and that \( MCl_4 \) is a colorless liquid. Transition metals in the +4 oxidation state often form colorless complexes.
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