Find the total number of lone pairs present on the central atoms of the four ions I3-, ICl2-, ICl4- and BrF4- taken together. Give the answer as an integer.

JEE Main levelNumerical answerDifficulty 2 of 3ph071

Find the total number of lone pairs present on the central atoms of the four ions $I X_{3} X^{-}$ , $ICl X_{2} X^{-}$ , $ICl X_{4} X^{-}$ and $BrF X_{4} X^{-}$ taken together. Give the answer as an integer.

Numerical answer type, tolerance 0.5.

Number of lone pairs on the central atom:

I X_{3} X^{-}

has 3 (5 pairs, 2 bonding),

ICl X_{2} X^{-}

has 3,

ICl X_{4} X^{-}

has 2 (6 pairs, 4 bonding) and

BrF X_{4} X^{-}

has 2. Total

= 3 + 3 + 2 + 2 = 10.