See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

(A) Stronger the inter-atomic interaction, higher the enthalpy of atomization. (B) Cr+ has half-filled valence shell electronic configuration (3d5), so it has higher second ionization energy. Similarly, Cu+ has completely filled valence shell electronic configuration 3d10, so it has higher second ionization energy. (C) Sum of first two ionization energies (IE1 + IE2) of Ni(II) is less than that of Pt(II), while sum of first four ionization energies (IE1 + IE2 + IE3 + IE4) of Pt (IV) is less than that of Ni(IV). (D) Occurs in the middle, e.g. Mn has +7 oxidation state.