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Q.

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

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a

(A) is true but (R) is false

b

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

c

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

d

Both (A) and (R) are false

answer is D.

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Detailed Solution

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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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