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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3qa219

Select the correct statements about the oxidation state of iron (taking NO as $NO X^{+}$ where present).

AIn $Fe X_{4} [Fe (CN) X_{6}] X_{3}$ , the iron in the cyanide complex is $+ 2$ and the iron outside the complex is $+ 3$
BIn $K X_{4} [Fe (CN) X_{6}]$ iron is $+ 2$
CIn $Na X_{2} [Fe (CN) X_{5} NO]$ iron is $+ 3$
DIn $[Fe (H X_{2} O) X_{5} NO] X^{2 +}$ iron is $+ 1$

Answer: A, B, D

Prussian blue contains 3

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

units (Fe(II)) balanced by 4

Fe X^{3 +}

(

12 + = 12 -

). In the brown ring complex

x + 1 = + 2

gives

+ 1

. In

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

,

x - 6 = - 4

gives

+ 2

. In nitroprusside,

x + 1 - 5 = - 2

gives

+ 2

, not

+ 3

.

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