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NTA Abhyas JEE Main2020Chemistryd and f Block ElementsPractice

Which of the following pairs has the same size?

Options

  1. AZ n 2 + ,H f 4 +
  2. BF e 2 + , C u 2 +
  3. CZ r 4 + , H f 4 +
  4. DZ r 4 + , T i 4 +

Correct answer

C. Z r 4 + , H f 4 +

Step-by-step solution

Here Z r + 4 (4d) and H f + 4 (5d) are having same size which is possible due to poor screening effect by inner d or f orbitals electrons due to highly diffused shape of these orbitals or lanthanide contraction in Hf .

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