Which of the following statement is/are true?

Options

A. All alkali metals are soft and can be cut with knife
B. Alkali metals do not occur in free state in nature
C. Alkali metals are highly electropositive elements
D. Alkali metal hybrides are covalent in character

Answer

To determine which statements about alkali metals are true, we will analyze each statement one by one based on the properties of alkali metals.

### Step-by-Step Solution:

1. **Statement 1: All alkali metals are soft and can be cut with a knife.**
- Alkali metals (Li, Na, K, Rb, Cs) are indeed soft and can be easily cut with a knife. This is due to their large atomic size and low density, which results in weak metallic bonding. Therefore, this statement is **true**.

2. **Statement 2: Alkali metals do not occur in free state.**
- Alkali metals have one valence electron, which they readily lose to form monovalent ions (M⁺). This high reactivity means they do not exist in a free state in nature; instead, they are found in compounds. Thus, this statement is **true**.

3. **Statement 3: Alkali metals are highly electropositive elements.**
- Alkali metals are characterized by having a single valence electron in their outermost shell, which they can easily lose to form positive ions. This makes them highly electropositive. Therefore, this statement is **true**.

4. **Statement 4: Alkali metal hydrides are covalent in character.**
- Alkali metal hydrides (e.g., NaH, KH) are formed when alkali metals react with hydrogen. These hydrides are predominantly ionic in nature due to the large difference in electronegativity between alkali metals and hydrogen. Therefore, this statement is **false**.

### Conclusion:
- Statements 1, 2, and 3 are true.
- Statement 4 is false.

### Final Answer:
The true statements are:
- Statement 1: True
- Statement 2: True
- Statement 3: True
- Statement 4: False