(A) : Chemistry of Lanthanoids is more complicated than Actinoids.
(R) : All Lanthanoid elements are radioactive & manmade.

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(A) is true but (R) is false

Both (A) and (R) are true but (R) is not the correct explanation of (A)

Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are false

answer is D.

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Detailed Solution

Chemistry of actinoids is complicated as compared to lanthanoids because of the following reasons:
i. Actinoids are radioactive.
ii. Actinoids show wide range of oxidation states as energy difference between 5f, 6d and 7s subshells of the actinoids is small.

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