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NEET levelSingle correct optionDifficulty 1 of 3bn120

What is the oxidation number of Fe in $K X_{4} [Fe (CN) X_{6}]$ (cyanide is $- 1$ , K is $+ 1$ )?

A $+ 2$
B $+ 3$
C $+ 4$
D $0$

Answer: A

The complex ion carries

- 4

(four

K X^{+}

balance it):

x + 6 (- 1) = - 4

, so

x = + 2

.

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