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JEE Advanced levelSingle correct optionDifficulty 3 of 3sb150

Potassium in excess oxygen gives an orange-yellow paramagnetic solid X, whereas sodium heated in air gives a pale yellow diamagnetic solid Y. The ratio (bond order of the oxygen anion in X) : (bond order of the oxygen anion in Y) is:

A2.0
B0.67
C1.5
D1.25

Answer: C

X is

KO X_{2}

with

O X_{2} X^{-}

(one unpaired electron), bond order

1.5

. Y is

Na X_{2} O X_{2}

with

O X_{2} X^{2 -}

(no unpaired electron), bond order

1

. The ratio is

1.5/1 = 1.5

.

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