What are homogeneous and heterogeneous mixtures ? Which of the following are homogeneous ?
(a) tap water (b) wood (c) soil (d) smoke (e) cloud.

Explanation

### Step-by-Step Solution:

1. **Definition of Mixtures**:
- A mixture is a combination of two or more substances where each substance retains its own properties.

2. **Homogeneous Mixtures**:
- A homogeneous mixture is one in which the components are uniformly distributed throughout the mixture. This means that any sample taken from the mixture will have the same composition as any other sample.
- Examples include solutions like saltwater, air, and tap water.
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