Tell whether each of the following properties describes a heterogeneous mixture, a solution or a homogeneous mixture, a compound or an element.
(i) A homogeneous liquid which leaves a solid residue on boiling.
(ii) A cloudly liquid which after some time appear more cloudly towards the bottom.
(iii) A uniform white solid that has a sharp and definite melting point which cannot be decomposed into simpler substances by special techniques.
(iv) A colourless liquid which boils at definite temperature and can be decomposed into simpler substances.

Explanation

To solve the question, we will analyze each property provided and categorize it as either a heterogeneous mixture, a solution, a homogeneous mixture, a compound, or an element.

### Step-by-Step Solution:

**(i)** A homogeneous liquid which leaves a solid residue on boiling.
- **Analysis**: This describes a solution where a solute is dissolved in a solvent. When boiled, the solvent evaporates, leaving behind the solid residue (solute).
- **Conclusion**: This is a **solution**.

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