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JEE Main levelSingle correct optionDifficulty 2 of 3pn007

Consider the statements: (I) The electron gain enthalpy of sulphur is more negative than that of oxygen. (II) The first ionisation enthalpy of nitrogen is higher than that of phosphorus. (III) The N-N single bond is stronger than the P-P single bond. (IV) Among the group 15 elements only nitrogen is a gas at room temperature. The number of correct statements is

  1. A1
  2. B2
  3. C4
  4. D3

Answer: D

(I) is true because the compact subshell of oxygen causes strong repulsion for the incoming electron. (II) is true as the smaller holds its electrons more tightly. (III) is false because lone pair repulsion makes the N-N bond weaker than P-P. (IV) is true; is the only gaseous element of the group. Statements I, II and IV are correct, so the count is 3.
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