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Choose the correct option regarding the following.
Assertion Actinides exhibit a larger number of oxidation states than lanthanides.
Reason There is a large energy gap between $5 f, 6 d$ and $7 s$ sub-shells.
Options:
Assertion Actinides exhibit a larger number of oxidation states than lanthanides.
Reason There is a large energy gap between $5 f, 6 d$ and $7 s$ sub-shells.
Solution:
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Verified Answer
The correct answer is:
Assertion is correct, Reason is wrong.
Actinides exhibit larger oxidation states than lanthanides because of the very small energy gap between $5 f, 6 d$ and $7 s$ subshells. Thus, the outermost electrons get easily excited to the higher energy levels, giving variable oxidation states. Hence, Assertion is correct, Reason is incorrect. Thus, the correct option is (3).
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