Aluminium is not used

Options

A. In silvery paints
B. For making utensils
C. As a reducing involves
D. As oxidizer in metallurgy

Explanation

**Step-by-Step Solution:**

1. **Understanding Aluminium's Properties:**
- Aluminium has an atomic number of 13, which means it has 13 electrons. Its electronic configuration is 1s² 2s² 2p⁶ 3s² 3p¹.
- In the outermost shell (valence shell), Aluminium has three electrons (two in the 3s subshell and one in the 3p subshell).

2. **Determining Aluminium's Behavior:**
- Aluminium can easily lose these three valence electrons to form a +3 oxidation state. This characteristic allows Aluminium to act as a reducing agent, as it can donate electrons to other substances.

3. **Identifying Aluminium's Role:**
- As a reducing agent, Aluminium is used in various chemical reactions, especially in metallurgy where it helps in the reduction of metal ores.
- However, Aluminium does not act as an oxidizing agent. An oxidizing agent is a substance that gains electrons in a chemical reaction, which is contrary to Aluminium's behavior.

4. **Analyzing the Options Given:**
- Option 1: Used in silvery paints - True, Aluminium is used in paints for its reflective properties.
- Option 2: Used in utensils - True, Aluminium is widely used in cookware and utensils due to its lightweight and good thermal conductivity.
- Option 3: Used as a reducing agent - True, Aluminium is indeed used as a reducing agent in various reactions.
- Option 4: Used as an oxidizer in metallurgy - False, Aluminium is not used as an oxidizer; it is primarily a reducing agent.

5. **Conclusion:**
- Based on the analysis of the options, the correct answer is that Aluminium is not used as an oxidizer in metallurgy.

**Final Answer:**
Aluminium is not used as an oxidizer in metallurgy (Option 4).

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