Which of the following substances is used for making mirrors?

Options

A. Pure Sn
B. Pure Hg
C. Zinc amalgam
D. Tin amalgam

Answer

To determine which substance is used for making mirrors, we need to analyze the options provided:

1. **Pure Tin (Sn)**: Tin itself is not commonly used to make mirrors. While it can reflect light, it does not have the necessary properties to form a reflective surface like a mirror.

2. **Pure Mercury (Hg)**: Pure mercury is a liquid metal and is not used to make mirrors due to its toxicity and the fact that it cannot form a solid reflective surface.

3. **Zinc Amalgam (Zn-Hg)**: Zinc amalgam, which is a mixture of zinc and mercury, is not typically used for making mirrors. It does not provide the reflective quality needed for a mirror.

4. **Tin Amalgam (Sn-Hg)**: Tin amalgam is a mixture of tin and mercury. This amalgam is known for its reflective properties and is commonly used to coat glass to create mirrors.

Based on this analysis, the correct answer is **Tin Amalgam (Sn-Hg)**, which is used for making mirrors.

### Step-by-Step Solution:
1. **Identify the materials**: List the substances given in the question: Pure Tin, Pure Mercury, Zinc Amalgam, and Tin Amalgam.
2. **Evaluate each substance**:
- Pure Tin: Not used for mirrors.
- Pure Mercury: Not suitable for mirrors due to its liquid state and toxicity.
- Zinc Amalgam: Not used for mirrors.
- Tin Amalgam: Known for its reflective properties and used in mirror production.
3. **Select the correct option**: Based on the evaluation, the substance used for making mirrors is Tin Amalgam (Sn-Hg).