1.

Assertion (A) : The overall decrease in atomic and ionic radii from lanthanum to lutetium is called lanthanoide contraction. Reason (R) : Permanganate titrations can be carried out in the presence of any mineral acid.

Answer»

Both Assertion (A) and REASON (R) are CORRECT statements, and Reason (R) is the correct EXPLANATION of the Assertion (A).
Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).
Assertion (A) is correct, but Reason (R) is incorrect STATEMENT.
Assertion (A) is incorrect, but Reason (R) is correct statement.

Answer :C


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