Which of the following are metalloids?
(i) Boron
(ii) Sodium
(iii) Silicon
(iv) Chlorine
(v) Germanium

Options

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

Explanation

To determine which of the given elements are metalloids, we will analyze each option based on the definition of metalloids and their properties.

### Step-by-Step Solution:

1. **Understand the Definition of Metalloids**:
- Metalloids are elements that have properties intermediate between metals and non-metals. They often exhibit characteristics of both categories.

2. **List the Given Elements**:
- The elements provided in the question are:
- (i) Boron
- (ii) Sodium
- (iii) Silicon
- (iv) Chlorine
- (v) Germanium

3. **Identify Each Element's Classification**:
- (i) **Boron (B)**: Boron is classified as a metalloid.
- (ii) **Sodium (Na)**: Sodium is classified as a metal.
- (iii) **Silicon (Si)**: Silicon is classified as a metalloid.
- (iv) **Chlorine (Cl)**: Chlorine is classified as a non-metal.
- (v) **Germanium (Ge)**: Germanium is classified as a metalloid.

4. **Compile the Results**:
- From the classifications:
- Metalloids: Boron, Silicon, Germanium
- Not Metalloids: Sodium, Chlorine

5. **Final Answer**:
- The elements that are metalloids from the given options are:
- (i) Boron
- (iii) Silicon
- (v) Germanium

### Conclusion:
Thus, the correct answer is that the metalloids among the given options are Boron (i), Silicon (iii), and Germanium (v).

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