The correct statement(s) from among the following is/are?
(i). all the d and f-block elements are metals
(ii). all the d and f-block elements form coloured ions
(iii). All th d- and f-block elements form paramagnetic ions

Options

A. (i) only
B. (i) and (ii)
C. (ii) and (iii)
D. all

Answer

To determine the correct statements regarding the d and f-block elements, let's analyze each statement one by one.

### Step 1: Analyze Statement (i)
**Statement (i): All the d and f-block elements are metals.**

- **Explanation:** The d-block elements are known as transition metals, and the f-block elements are known as inner transition metals. Both categories consist entirely of metals. Therefore, this statement is **correct**.

### Step 2: Analyze Statement (ii)
**Statement (ii): All the d and f-block elements form colored ions.**

- **Explanation:** While many d-block elements do form colored ions due to the presence of unpaired electrons in their d-orbitals, not all do. For example, zinc (Zn) has a full d-subshell (d10 configuration) in its common oxidation state (Zn²⁺), leading to colorless ions. Therefore, this statement is **incorrect**.

### Step 3: Analyze Statement (iii)
**Statement (iii): All the d- and f-block elements form paramagnetic ions.**

- **Explanation:** Paramagnetism arises from the presence of unpaired electrons. However, many d- and f-block elements, such as Zn²⁺ and Sc³⁺, have all their electrons paired in their respective oxidation states, making them diamagnetic. Therefore, this statement is also **incorrect**.

### Conclusion:
From the analysis above, we conclude that:
- Statement (i) is correct.
- Statements (ii) and (iii) are incorrect.

Thus, the only correct statement is **(i)**.

### Final Answer:
The correct statement is: **(i) All the d and f-block elements are metals.**

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