Consider the following points `:`
`(a) Cs` is the strongest reducing agent is `IA` group element
`(B)" "Be(OH)_(2)` is amphoteric
`(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.`
Correct statements are `:`

Options

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

Answer

To determine which statements are correct from the given points, we will analyze each statement one by one.

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

- **Explanation:** In group IA (alkali metals), lithium (Li) is actually the strongest reducing agent, not cesium (Cs). This is because the reduction potential of lithium is more negative than that of cesium. The more negative the reduction potential, the stronger the reducing agent. The values are:
- Lithium: -3.04 V
- Cesium: -2.927 V
- **Conclusion:** This statement is **incorrect**.

### Step 2: Analyze Statement (b)
**Statement (b): Be(OH)₂ is amphoteric.**

- **Explanation:** Beryllium hydroxide, Be(OH)₂, is indeed amphoteric. It can react with both acids and bases. For example:
- With an acid (like H₂SO₄), it forms barium sulfate (BaSO₄).
- With a base (like NaOH), it forms a complex like Na₂Be(OH)₄.
- **Conclusion:** This statement is **correct**.

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

- **Explanation:** The density of potassium (K) is actually greater than that of sodium (Na). As we move down the group in alkali metals, the atomic radius increases, leading to an increase in volume. Since density is mass divided by volume, and the mass of potassium is greater than that of sodium while its volume is also larger, the density of potassium is higher than that of sodium.
- **Conclusion:** This statement is **incorrect**.

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

- **Explanation:** In alkali metals, the melting point decreases as we move down the group. Therefore, lithium (Li) does not have the minimum melting point; cesium (Cs) has the lowest melting point among the group.
- **Conclusion:** This statement is **incorrect**.

### Final Conclusion
The correct statements from the given options are:
- Statement (b): Be(OH)₂ is amphoteric.

Thus, the only correct statement is **B**.

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