Heavier halide is oxidised by lighter halogen. Justify.

Explanation

### Step-by-Step Solution

1. **Understanding Halogens and Halides**:
- The halogens are a group of elements in Group 17 of the periodic table, which includes fluorine (F), chlorine (Cl), bromine (Br), and iodine (I).
- The heavier halides refer to compounds formed with heavier halogens, such as HI (hydrogen iodide) and HBr (hydrogen bromide).

2. **Identifying Lighter and Heavier Halogens**:
- In the context of the question, lighter halogens are those that are higher up in the group, such as fluorine and chlorine, while heavier halogens are those lower down, such as bromine and iodine.
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