Q28 / 125 · BITSAT 2011 · 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

Due to lanthanide contraction, the size of $\mathrm{Zr}$ and $\mathrm{Hf}$ (atom and ions) become nearly similar.

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

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