Consider the following points
(a) Cs is the strongest reducing agent in IA group element
(b) Be does not form peroxide in IIA group elements
(c ) The density of potassium is less than sodium
(d) In alkali metals `Li, Na, K` and Rb, lithium has the minimum value of M.P. Point out that the statement-

Options

A. (a) & (b) are correct
B. (a),(b) & (c ) are correct
C. (b) & (c ) are correct
D. (b), (c ) & (d) are correct

Answer

To analyze the statements provided in the question, let's go through each one step by step.

### Step 1: Analyze Statement (a)
**Statement:** Cs is the strongest reducing agent in IA group element.

**Analysis:**
- In the alkali metals (group 1A), reducing strength increases down the group.
- However, lithium is often considered a stronger reducing agent in many reactions because it can donate its electron more readily in certain conditions compared to cesium.
- Therefore, this statement is **incorrect**.

### Step 2: Analyze Statement (b)
**Statement:** Be does not form peroxide in IIA group elements.

**Analysis:**
- Beryllium (Be) does not form peroxides.
- It typically forms oxides with the formula BeO, and it is known that beryllium does not exhibit the same behavior as other alkaline earth metals in forming peroxides.
- Thus, this statement is **correct**.

### Step 3: Analyze Statement (c)
**Statement:** The density of potassium is less than sodium.

**Analysis:**
- The densities of alkali metals generally increase down the group.
- Potassium (K) has a density of about 0.89 g/cm³, while sodium (Na) has a density of about 0.97 g/cm³.
- Therefore, potassium is indeed less dense than sodium, making this statement **correct**.

### Step 4: Analyze Statement (d)
**Statement:** In alkali metals Li, Na, K, and Rb, lithium has the minimum value of M.P.

**Analysis:**
- The melting points of alkali metals decrease down the group.
- Lithium has a melting point of about 180.5 °C, while rubidium (Rb) and cesium (Cs) have much lower melting points (Rb ~ 39.3 °C and Cs ~ 28.5 °C).
- Therefore, this statement is **incorrect**.

### Conclusion
Based on the analysis:
- Statement (a) is incorrect.
- Statement (b) is correct.
- Statement (c) is correct.
- Statement (d) is incorrect.

Thus, the correct statements are (b) and (c).