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JEE Main levelOne or more correct optionsDifficulty 2 of 3bn141

In which of the following does the specified atom have an AVERAGE oxidation number of exactly $+ 2$ ?

AFe in $K X_{4} [Fe (CN) X_{6}]$
BNi in $Ni (CO) X_{4}$
CS in $S X_{2} O X_{3} X^{2 -}$ (average of both S atoms)
DCu in $CuSO X_{4} \cdot 5 H X_{2} O$

Answer: A, C, D

Fe:

x - 6 = - 4

, so

+ 2

. Ni in

Ni (CO) X_{4}

is

0

because CO is neutral. S in

S X_{2} O X_{3} X^{2 -}

:

2 x - 6 = - 2

, so

+ 2

. Cu in

CuSO X_{4}

is

+ 2

.

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