Q54 · CSIR-NET Chemistry, June 2013

Paper: CSIR-NET June 2013 · Subject: Inorganic Chemistry · Chapter: Main Group Elements · Topic: Main Group Elements – General · Marks: 2 · Difficulty: Easy

Identify the pairs in which the covalent radii of elements are almost similar

\[ \begin{array}{ll} \text{(A) Nb, Ta} & \text{(B) Mo, W} \\ \text{(C) La, Lu} & \text{(D) Sc, Y} \end{array} \]

(a)A and B only

(b)A and C only

(c)B and C only

(d)A, B and C only

Answer

Answer: A ✓ checked by 4AB · confidence high

Explanation

The lanthanide contraction makes the 4d/5d pairs Nb/Ta and Mo/W almost identical in size; La/Lu and Sc/Y differ appreciably. A and B.

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