Question

Which one of the following statements is correct?

• A. Ionic radius of $ \text{F}{{\text{e}}^{\text{3+}}} $ is greater than $ \text{F}{{\text{e}}^{\text{2+}}} $
• B. Atomic radius of chlorine atom is greater than the ionic radius of chloride ion
• C. Electron affinity of phosphorus is greater than nitrogen
• D. $ \text{C}{{\text{s}}_{\text{2}}}\text{O} $ is strongly acidic in nature

Answer 1

Answer: (C)

$ _{7}N=1{{s}^{2}},2{{s}^{2}},2{{p}^{3}} $ $ _{15}P=1{{s}^{2}},2{{s}^{2}},2{{p}^{6}},3{{s}^{2}},3{{p}^{3}},3{{d}^{0}} $ In P, vacant d-orbitals are present. In the excited state, one electron from 3s-orbital jumps into 3d-orbital. Therefore, its electron affinity is high. On the other hand, the p-orbital is of N is half-filled, therefore it behaves like inert. Hence, its electron affinity is negligible.