Read the given statements carefully.
I. Metals are generally ductile and metal `W` is a highly ductile metal.
II. Metals generally possess high melting points but few metals like `X` have low melting point.
III. Among metals `Y` is the best conductor of heat.
IV. Among metals, `Z` is the poorest conductor of heat.
`W, X, Y` and `Z` can be respectively

Options

A. Aluminium, sodium, lead and silver
B. Platinum, potassium, silver and lead
C. Copper, zinc, silver and mercury
D. Iron, sodium, gold and lead.

Answer

To solve the question, we need to analyze each statement and identify the metals `W`, `X`, `Y`, and `Z` based on the properties described.

### Step-by-Step Solution:

1. **Identify Metal W**:
- The first statement mentions that "metals are generally ductile and metal W is a highly ductile metal."
- The most ductile metal known is **platinum**. Therefore, we can conclude that:
- **W = Platinum (Pt)**

2. **Identify Metal X**:
- The second statement states that "metals generally possess high melting points but few metals like X have low melting points."
- A well-known metal with a low melting point is **potassium**. Thus, we can determine that:
- **X = Potassium (K)**

3. **Identify Metal Y**:
- The third statement claims that "among metals Y is the best conductor of heat."
- The best conductor of heat among metals is **silver**. Hence, we can conclude that:
- **Y = Silver (Ag)**

4. **Identify Metal Z**:
- The fourth statement indicates that "among metals, Z is the poorest conductor of heat."
- **Lead** is known to be a poor conductor of heat compared to other metals. Therefore, we can deduce that:
- **Z = Lead (Pb)**

### Final Assignments:
- W = Platinum (Pt)
- X = Potassium (K)
- Y = Silver (Ag)
- Z = Lead (Pb)

### Conclusion:
Thus, the metals `W`, `X`, `Y`, and `Z` can be respectively identified as:
- **W = Platinum**
- **X = Potassium**
- **Y = Silver**
- **Z = Lead**