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JEE Main levelSingle correct optionDifficulty 2 of 3bn087

Which is the formula of potassium hexacyanoferrate(II)?

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

Answer: D

The complex ion has Fe

+ 2

and six

CN X^{-}

, so charge

= + 2 - 6 = - 4

, i.e.

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

. Four

K X^{+}

are needed:

K X_{4} [Fe (CN) X_{6}]

. The K

_{3}

salt is the hexacyanoferrate(III).

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