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Q.

Statement 1: Superoxide ion is paramagnetic whereas peroxide ion is diamagnetic.
Statement 2: Superoxide ion ${[O - O]}^{-}$ has one unpaired electron whereas peroxide ion ${[O - O]}^{- 2}$ has no unpaired electron.

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a

Statement 1 is correct and statement 2 is incorrect

b

Statement 1 is incorrect and statement 2 is correct

c

Both statements 1 and 2 are correct

d

Both statements 1 and 2 are incorrect

answer is A.

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Detailed Solution

${[O - O]}^{-}$ has MO configuration

$σ 1 s^{2} σ^{*} 1 s^{2}, σ 2 s^{2} σ^{*} 2 s^{2}, σ 2 p^{2} π 2 p_{x}^{2} π 2 p_{y}^{2} π^{*} 2 p_{x}^{2} π^{*} 2 p_{y}^{1}$

${[O - O]}^{2 -}$ has MO configuration

$σ 1 s^{2} σ^{*} 1 s^{2}, σ 2 s^{2} σ^{*} 2 s^{2}, σ 2 p^{2} π 2 p_{x}^{2} π 2 p_{y}^{2} π^{*} 2 p_{x}^{2} π^{*} 2 p_{y}^{2}$

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Statement 1: Superoxide ion is paramagnetic whereas peroxide ion is diamagnetic.Statement 2: Superoxide ion O-O− has one unpaired electron whereas peroxide ion O-O-2 has no unpaired electron.