Correct statement/s among the following with respect to ionization energy (IE) is/are (i) $\left(\mathrm{IE}_{1}+\mathrm{IE}_{2}+\mathrm{IE}_{3}\right)$ for indium is more than that of aluminium (ii) $\mathrm{IE}_{1}$ of scandium is higher than that of cobalt (iii) $\mathrm{IE}_{1}$ of gallium is lower than that of selenium (iv) $\mathrm{IE}_{1}$ of nitrogen is greater than that of oxygen
(a)(ii) and (iv)
(b)(iii) and (iv)
(c)(i) and (iv)
(d)(ii) and (iii)
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
(i) false — the sum for In (≈5083 kJ) is less than Al (≈5139). (ii) false — IE₁(Sc) 633 < IE₁(Co) 760. (iii) true — Ga 579 < Se 941. (iv) true — half-filled 2p³ makes N (1402) > O (1314).