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NTA Abhyas JEE Main2020Chemistryd and f Block ElementsPractice

Consider the following statements: (I) L a O H 3 is the least basic among hydroxides of lanthanides. (II) Z r 4 + and H f 4 + possess almost the same ionic radii. (III) C e 4 + can act as an oxidizing agent. Which of the above is/are true?

Options

  1. A(I) and (III)
  2. B(II) only
  3. C(II) and (III)
  4. D(I) only

Correct answer

C. (II) and (III)

Step-by-step solution

The basic character of hydroxides decreases from L a O H 3 to L u O H 3 . Due to smaller size of Lu, the Lu − OH bond attains more covalent character. Also, due to Lanthanide contraction Zr 4+ and Hf 4+ possess almost the same ionic radii. Ce 4+ is a strong oxidant.

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