Classify the following as pure substance or mixture and given reasons.

Options

A. 22 carat gold
B. Wood
C. Cloud
D. Iron

Explanation

To classify the given substances as pure substances or mixtures, we need to understand the definitions of both terms:

1. **Pure Substance**: A material that has a constant composition and has consistent properties throughout the sample. It can be either an element (made of only one type of atom) or a compound (made of molecules that contain two or more types of atoms).

2. **Mixture**: A combination of two or more substances where each substance retains its own properties. Mixtures can be homogeneous (uniform composition) or heterogeneous (non-uniform composition).

Now, let's classify the given substances one by one:

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