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Question
Assertion: The basic strength of oxides and hydroxides of lanthanoids decrease with increase in atomic number.
Reason: The size of cation of lanthanoids increases with increase in atomic number.
Options
If both Assertion and Reason are CORRECT and Reason is the CORRECT explanation of the Assertion.
If both Assertion and Reason are CORRECT but Reason is not the CORRECT explanation of the Assertion.
If Assertion is CORRECT but Reason is INCORRECT.
If Assertion is INCORRECT but Reason is CORRECT.
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Solution
If Assertion is CORRECT but Reason is INCORRECT.
Explanation:
The basic strength of oxides and hydroxides of lanthanoids decreases with an increase in atomic number due to lanthanoid contraction, which causes a decrease in ionic size. However, the reason is incorrect because the size of lanthanoid cations actually decreases, not increases, with an increase in atomic number.
