Metallic Hydrides

Options

A. Are also called interstitial hydrides
B. Are non-stoichiometric, being deffcient in hydrogen
C. Are poor conductors of electricity, exhibit less paramagnetism and have hydrogen as atom and not as a molecular.
D. Have all properties given above

Answer

### Step-by-Step Solution for the Question on Metallic Hydrides

1. **Understanding Metallic Hydrides**:
- Metallic hydrides are compounds formed between hydrogen and metals, particularly transition metals. They are characterized by the presence of hydrogen atoms within the metallic lattice.

2. **Interstitial Hydrides**:
- These hydrides are often referred to as interstitial hydrides because the small size of hydrogen atoms allows them to occupy interstitial sites in the metal lattice. This is a key property of metallic hydrides.

3. **Non-Stoichiometric Nature**:
- Metallic hydrides are typically non-stoichiometric, meaning the ratio of hydrogen to metal is not fixed. This can result in a range of hydrogen content within the hydride. For example, titanium hydride can have a stoichiometry of 1.6 to 1.8, indicating that the amount of hydrogen can vary.

4. **Electrical Conductivity and Paramagnetism**:
- Metallic hydrides are generally poor conductors of electricity and exhibit low levels of paramagnetism. This is due to the nature of the bonding and the presence of hydrogen in the lattice.

5. **Presence of Hydrogen as Atoms**:
- In metallic hydrides, hydrogen is present as individual hydrogen atoms rather than as diatomic hydrogen molecules (H₂). This is an important distinction that affects their properties.

6. **Analyzing the Options**:
- A) They are known as interstitial hydrides - True.
- B) They are non-stoichiometric, being deficient in hydrogen - True.
- C) They are poor conductors of electricity, exhibit less paramagnetism, and have hydrogen as atoms - True.
- D) They have all the properties given above - True.

7. **Conclusion**:
- Since all the properties mentioned in options A, B, and C are correct, the correct answer to the question is option D, which states that they have all the properties given above.

### Final Answer
The correct answer is **D) They have all the properties given above.**

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