the total number of species having nido structure is ____ (Given: atomic numbers of H, B, C, O, Ni, Rh and Os are 1, 5, 6, 8, 28, 45 and 76 respectively)
Answer
Answer (as printed): 3
The options are missing from the source scan for this question, so there is nothing here for this letter to point at. The letter is what the book printed.
Explanation
Answer: 3 — Nido: [C₂B₉H₁₁]²⁻, B₆H₁₀ and Os₆(CO)₂₀ (88 valence electrons = 14n + 4). [B₁₂H₁₂]²⁻ and Rh₆(CO)₁₆ are closo, B₅H₁₁ is arachno and [Ni₅(CO)₁₂]²⁻ is not nido.