Which of the following represent the incorrect composition of the given alloys ?
(i) Duralumin - Aluminium, copper, magnesium and manganese
(ii) Magnalium - Aluminium and magnesium
(iii) Solder - Zinc and tin
(iv) Brass - Copper and zinc
(v) Bronze - Aluminium and copper

Options

A. (ii), (iv) and (v) only
B. (iv) and (v) only
C. (iii) and (v) only
D. (i), (iv) and (v) only

Explanation

To determine which of the given alloys has an incorrect composition, let's analyze each option step by step:

1. **Duralumin**: This alloy is composed of Aluminium, Copper, Magnesium, and Manganese.
- **Composition**: Correct. Duralumin is indeed made from these elements.

2. **Magnalium**: This alloy consists of Aluminium and Magnesium.
- **Composition**: Correct. Magnalium is primarily an alloy of Aluminium and Magnesium.

3. **Solder**: This is typically an alloy of Tin and Lead, but in some cases, it can also include Zinc.
- **Composition**: Incorrect. The common composition of solder is Tin and Lead, not just Zinc and Tin.

4. **Brass**: This alloy is made of Copper and Zinc.
- **Composition**: Correct. Brass is correctly identified as an alloy of Copper and Zinc.

5. **Bronze**: This alloy is primarily composed of Copper and Tin, not Aluminium and Copper.
- **Composition**: Incorrect. Bronze is typically an alloy of Copper and Tin.

Now, let's summarize the findings:

- **Duralumin**: Correct
- **Magnalium**: Correct
- **Solder**: Incorrect (should be Tin and Lead)
- **Brass**: Correct
- **Bronze**: Incorrect (should be Copper and Tin)

Thus, the incorrect compositions are related to **Solder** and **Bronze**.

### Final Answer:
The incorrect compositions are:
- Solder - should be Tin and Lead
- Bronze - should be Copper and Tin