Statement-1: Down the group, electronegativity decreases from B to Tl.
Statement-2: Electronegativity of an element depends on its electron affinity and ionisation energy.

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Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1.

Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1.

Statement-1 is True, Statement-2 is False.

Statement-1 is False, Statement-2 is True.

answer is D.

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Detailed Solution

Group 13's electronegativity gradually increases from B to Al after first decreasing from B to Al.
A low ionisation energy means that an element quickly donates electrons to a process, whereas a high electronegativity implies that an element actively wants to absorb electrons in a reaction. This makes the ionisation energy a kind of counter attribute to electronegativity.

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