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BCECE Engineering BCECE Engineering Solved Paper-2014

  • question_answer
    48.          Consider the following statements. I. \[\text{La}{{\left( \text{OH} \right)}_{\text{3}}}\]is the least basic among hydroxides of lanthanides. II. \[Z{{r}^{4+}}\]and \[\text{H}{{\text{f}}^{\text{4+}}}\]possess almost the same ionic radii. III. \[C{{e}^{4+}}\] can act as an oxidising agent. Which of the above is/are true?

    A) l and III                

    B) II and III

    C) II only                   

    D) l and II

    Correct Answer: B

    Solution :

    The basic character of hydroxides decreases from La \[{{\left( \text{OH} \right)}_{\text{3}}}\] to Lu\[{{\left( \text{OH} \right)}_{\text{3}}}\]. Due to smaller size of Lu. The Lu?OH bond attains more covalent character. La \[{{\left( \text{OH} \right)}_{\text{3}}}\] is the most basic among hydroxides of lanthanoids. Statement II and III are true.


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