COMEDK2015Chemistryd and f Block Elements
Which of the following pairs has the same size?
Options
- AFe ²⁺, Ni ²⁺
- BZr ⁴⁺, Ti ⁴⁺
- CZr ⁴⁺, Hf ⁴⁺
- DZn ²⁺, Hf ⁴⁺
Correct answer
C. Zr ⁴⁺, Hf ⁴⁺
Step-by-step 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, Zr ⁴⁺ and Hf ⁴⁺ has same size.