STATEMENT-1 : The oxidation state of Tl is +1. STATEMENT-2 : Moving from top to bottom in IIIA group, the stability of +1 oxidation state increases.
A
STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is a correct explanation for STATEMENT-1
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B
STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is NOT a correct explanation for STATEMENT-1
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C
STATEMENT-1 is True, STATEMENT-2 is False
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D
STATEMENT-1 is False, STATEMENT-2 is True
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Solution
The correct option is C STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is a correct explanation for STATEMENT-1 Due to inert pair effect, stability of +1 oxidation state increases and +3 decreases down the group. For thallium, +1 state is more stable than +3 state.