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JEE Main levelSingle correct optionDifficulty 2 of 3bn180

Which is the formula of potassium hexacyanidoferrate(II)?

A $K X_{3} [Fe (CN) X_{6}]$
B $K X_{4} [Fe (CN) X_{6}]$
C $K X_{4} [Fe (CN) X_{5}]$
D $K X_{2} [Fe (CN) X_{6}]$

Answer: B

Fe(II) with six

CN X^{-}

gives

[Fe (CN) X_{6}]^{4 -}

(

+ 2 - 6 = - 4

), needing four

K X^{+}

.

K X_{3} [Fe (CN) X_{6}]

is the iron(III) complex.

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