JEE Chemistry 2025 Question with Solution

Given: Orders of atomic radius, electronegativity, density, and 1st ionisation energy are to be checked for B, Al, Ga, In, and Tl.

Find: Which statements are correct, and hence the correct option.

From the solution, each statement is analysed one by one:

1. Atomic Radius: The atomic radius generally increases down a group due to addition of electron shells. Hence, $B$

2. Electronegativity: The solution states that electronegativity typically decreases down a group, and for these elements B should have the highest electronegativity. The given order $Al$

3. Density: The provided order $Tl$

4. 1st Ionisation Energy: The solution states that although ionisation energy generally decreases down a group, exceptions occur. The order $In$

Therefore, the correct statements are A and D.

The solution also explicitly shows The Correct Option is A, and among the final answer choices this corresponds to B and D Only.

So, the correct option is A.