Question

Statement 1 : Superoxide ion is paramagnetic whereas peroxide ion is diamagnetic.
Statement 2 : Superoxide ion $[O=O^{-}$has one unpaired electron whereas peroxide ion $[O=O{]}^{-}$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
$\sigma 1s^2{\sigma }^{\ast }1s^2,\sigma 2s^2{\sigma }^{\ast }2s^2,\sigma 2p^2\pi 2p_x^2\pi 2p_y^2{\pi }^{\ast }2p_x^2{\pi }^{\ast }2p_y^1$
$[O=O{]}^{-}$has M.O. configuration
$\sigma 1s^2{\sigma }^{\ast }1s^2,\sigma 2s^2{\sigma }^{\ast }2s^2,\sigma 2p^2\pi 2p_x^2\pi 2p_y^2{\pi }^{\ast }2p_x^2{\pi }^{\ast }2p_y^2$