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EEJ MAIN Chemistry QUESTION #5551
Question 1
What is the total number of lone pairs of electrons in the $I_3^-$ ion?
  • 9✔️
  • 12
  • 3
  • 6
Correct Answer Explanation
In $I_3^-$: Central iodine has 3 lone pairs, each terminal iodine has 3 lone pairs each. Total lone pairs = 3 (central I) + 3 (terminal I) + 3 (terminal I) = 9 lone pairs. The structure is linear with the central I having 2 bond pairs and 3 lone pairs ($sp^3d$ hybridization).