In which of the following entropy increases?

Options

A. Rusting of iron
B. Melting of ice
C. Crystallisation of sugar from solution
D. Vaporisation of camphor

Explanation

To determine in which of the following processes entropy increases, we need to analyze each option based on the concept of entropy, which is a measure of disorder or randomness in a system.

### Step-by-Step Solution:

1. **Rusting of Iron**:
- In this process, iron reacts with moisture and oxygen to form rust (Fe2O3·xH2O), which is a solid.
- **Analysis**: The transition from elemental iron to rust involves the formation of a solid from elements, which generally leads to a decrease in randomness.
- **Conclusion**: Entropy decreases in this process.
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