A : `ScH_(2)` is an example of ionic hydride.
R : All metal forms ionic hydride.

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
B. If both Assertion & Reason are true but the reason is not the correct explanantion of the assertion, then mark (2)
C. If assertion is true statements but Reason is false, then mark (3)
D. If both Assertion and Reason are false statements, then mark (4)

Answer

To solve the assertion and reason question regarding Scandium Hydride (ScH₂) and the nature of hydrides formed by metals, we can follow these steps:

### Step 1: Analyze the Assertion
The assertion states that Scandium Hydride (ScH₂) is an example of an ionic hydride.

- **Evaluation**: Scandium (Sc) is a transition metal and belongs to the d-block of the periodic table. Transition metals typically form metallic hydrides rather than ionic hydrides. Ionic hydrides are primarily formed by s-block elements (alkali and alkaline earth metals) that readily lose their outermost electron to form cations.

**Conclusion**: The assertion is **incorrect**.

### Step 2: Analyze the Reason
The reason states that all metals form ionic hydrides.

- **Evaluation**: This statement is also not true. While s-block metals can form ionic hydrides, transition metals (d-block) and lanthanides/actinides (f-block) generally form metallic hydrides. Therefore, not all metals form ionic hydrides; many form metallic or covalent hydrides instead.

**Conclusion**: The reason is **also incorrect**.

### Step 3: Final Conclusion
Since both the assertion and the reason are incorrect, we can conclude that the correct answer is that both the assertion and the reason are false.

### Final Answer:
Both assertion and reason are false.

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