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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ph082

Which of the following are correct for the triiodide ion $I X_{3} X^{-}$ ?

AThe central iodine has three lone pairs.
BThe formal charge on the central iodine is $- 1$ .
CThe central iodine is $s p^{3} d^{2}$ hybridised.
DIt is linear.

Answer: A, B, D

I X_{3} X^{-}

has 5 electron pairs on the central I (2 bonding, 3 lone), so it is

s p^{3} d

and linear. Formal charge on central I

= 7 - 6 - 2 = - 1

and on each terminal I

= 7 - 6 - 1 = 0

. The

s p^{3} d^{2}

statement is wrong.

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