Q41 / 180 · COMEDK 2015 · Chemistry

Which of the following pairs has the same size?

  • A
    $\mathrm{Fe}^{2+}, \mathrm{Ni}^{2+}$
  • B
    $\mathrm{Zr}^{4+}, \mathrm{Ti}^{4+}$
  • Correct answer
    C
    $\mathrm{Zr}^{4+}, \mathrm{Hf}^{4+}$
  • D
    $\mathrm{Zn}^{2+}, \mathrm{Hf}^{4+}$

Solution

The similarity in the size of ions of the elements belonging to the same group of the second and third transition series is due to the effect of lanthanoid contraction. Thus, $\mathrm{Zr}^{4+}$ and $\mathrm{Hf}^{4+}$ has same size.

Hence, the correct answer is option: 'C'.

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