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JEE Main & Advanced Chemistry The d-and f-Block Elements / d तथा f ब्लॉक के तत्व Question Bank Mock Test - d- and f- Block Elements

  • question_answer
    Which of the following is correct about basic strength of hydroxide?

    A) \[Sc{{(OH)}_{3}}>Y{{(OH)}_{3}}>La{{(OH)}_{3}}\]

    B) \[La{{(OH)}_{3}}>Y{{(OH)}_{3}}>Sc{{(OH)}_{3}}\]

    C) \[La{{(OH)}_{3}}>Y{{(OH)}_{3}}>Sc{{(OH)}_{3}}\]

    D) \[Y{{(OH)}_{3}}>La{{(OH)}_{3}}>Sc{{(OH)}_{3}}\]  

    Correct Answer: A

    Solution :

    [a] Size \[=S{{c}^{3+}}<{{Y}^{3+}}<L{{a}^{3+}}\] Ionic character \[=Sc{{(OH)}_{3}}>Y{{(OH)}_{3}}>La{{(OH)}_{3}}\] Basic strength \[=Sc{{(OH)}_{3}}>Y{{(OH)}_{3}}>La{{(OH)}_{3}}\]


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