Which of the following statements is false regarding alkali metals ?

Options

A. Alkali metals are soft and can be cut with the help of knife
B. Alkali metals do not occur in free state in nature
C. Alkali metals are highly electropositive
D. Alkali metal hydrides are covalent in character

Explanation

To determine which statement is false regarding alkali metals, we first need to understand the properties of alkali metals. The alkali metals include lithium (Li), sodium (Na), potassium (K), rubidium (Rb), and cesium (Cs). Here’s a step-by-step analysis:

### Step 1: Identify the properties of alkali metals
- **Softness**: Alkali metals are known for being soft and can be easily cut with a knife. This is true for all alkali metals.
- **Reactivity**: Alkali metals are highly reactive, especially with water, and they tend to lose their outermost electron easily.
- **Density**: Alkali metals have low densities, with lithium, sodium, and potassium being less dense than water.
- **Melting and Boiling Points**: They have relatively low melting and boiling points compared to other metals.

### Step 2: Analyze the provided statements
- If the statements provided in the question include characteristics such as being soft, highly reactive, low density, or low melting points, we need to evaluate if any of these characteristics are incorrectly attributed to alkali metals.

### Step 3: Identify the false statement
- If a statement claims that alkali metals are hard or have high melting points, that would be false. However, if the statements reiterate their softness and reactivity, those would be true.

### Conclusion
Based on the properties of alkali metals, if any statement contradicts their known characteristics (for example, stating that they are hard or have high melting points), that would be the false statement.