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Statement-1: Inner transition elements are placed in group $III B$ .
Statement-2: In general the stable oxidation state for the inner transition elements is $+ 3$ .

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Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1.

Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1.

Statement-1 is true, statement-2 is false.

Statement-1 is false, statement-2 is true.

answer is A.

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Detailed Solution

All $f -$ block elements (inner transition elements belongs to $3^{rd}$ group according to $IUPAC$ which is $III B$ in old convension.
In general the stable oxidation state for the inner transition elements is $+ 3$ .

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