The following are some statements about VA group elements
I) All elements exhibits allotropy
II) Boiling points decrease down the group
III) They contain five electrons in their valency shell
The correct combination is

Options

A. All are correct
B. Only III is correct
C. I & II are correct
D. II & III are correct

Answer

To solve the question regarding the statements about VA group elements, we will analyze each statement one by one.

### Step 1: Analyze Statement I
**Statement I:** All elements exhibit allotropy.

- **Allotropes** are different forms of the same element in the same physical state.
- In the VA group (Nitrogen family), nitrogen, phosphorus, and arsenic exhibit allotropy.
- However, bismuth does not exhibit allotropy.

**Conclusion for Statement I:** This statement is **false**.

### Step 2: Analyze Statement II
**Statement II:** Boiling points decrease down the group.

- Generally, in a group of the periodic table, the boiling points tend to **increase** as you move down the group due to increased atomic size and mass.
- Therefore, for the VA group, the boiling points do not decrease down the group; they actually increase.

**Conclusion for Statement II:** This statement is **false**.

### Step 3: Analyze Statement III
**Statement III:** They contain five electrons in their valency shell.

- The elements in group VA (Nitrogen family) indeed have five valence electrons.
- For example:
- Nitrogen (N) has an atomic number of 7 with the electronic configuration of 1s² 2s² 2p³ (5 valence electrons).
- Phosphorus (P) has an atomic number of 15 with the electronic configuration of 1s² 2s² 2p⁶ 3s² 3p³ (5 valence electrons).
- This pattern continues for arsenic, antimony, and bismuth.

**Conclusion for Statement III:** This statement is **true**.

### Final Conclusion
- Statement I: False
- Statement II: False
- Statement III: True

Thus, the correct combination of statements regarding the VA group elements is that only **Statement III** is correct.

### Answer: The correct combination is **C** (only Statement III is correct).

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