Which of the following pairs has the same ionic size? (a) Zr4+, Hf4+ (b) Zn2+, Hf4+ (c) Fe2+, Ni2+ (d) Zr4+, Ti4+

Which of the following pairs has the same ionic size? (a) Zr4+, Hf4+

1.	Which of the following pairs has the same ionic size? (a) Zr4+, Hf4+ (b) Zn2+, Hf4+ (c) Fe2+, Ni2+ (d) Zr4+, Ti4+
Answer» OPTION (a) is the right ANSWER Explanation:DUE to LANTHANIDES contraction.