Question

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

• A. If both Statement 1 and Statement 2 are true and the statement 2 is the correct explanation of the statement 1 .
• B. If both Statement 1 and Statement 2 are true but statement 2 is not the correct explanation of the statement 1 .
• C. If Statement 1 is true but Statement 2 is false.
• D. If Statement 1 is false but Statement 2 is true.

Answer 1

Answer: (A)

$[ O = O ]^{-}$has M.O. configuration
$\sigma 1 s^2 \sigma^ * 1 s^2, \sigma 2 s^2 \sigma^ * 2 s^2, \sigma 2 p^2 \pi 2 p_x^2 \pi 2 p_y^2 \pi^ * 2 p_x^2 \pi ^* 2 p_y^1$
$[ O = O ]^{-}$has M.O. configuration
$\sigma 1 s^2 \sigma^ * 1 s^2, \sigma 2 s^2 \sigma ^* 2 s^2, \sigma 2 p^2 \pi 2 p_x^2 \pi 2 p_y^2 \pi^ * 2 p_x^2 \pi ^* 2 p_y^2$