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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
    Across the lanthanide series, the basicity of the lanthanoid hydroxides

    A) increases

    B) decreases

    C) first increases and then decreases

    D) does not change

    Correct Answer: B

    Solution :

    [b] Across lanthanoid series basicity of lanthanoid hydroxides decreses. The basicity decreses form \[Ce{{(OH)}_{3}}\] to\[Lu{{(OH)}_{3}}\]. Due to lanthanide contraction, the decrease in the size of the cation increases the covalent character between the lanthanide ion and hydroxide ion thereby, reducing the basic character of the lanthanide hydroxide.


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