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JEE Main levelOne or more correct optionsDifficulty 2 of 3cc105

In which of the following does the metal have an oxidation state of $+ 3$ ?

A $[Co (NH X_{3}) X_{5} Cl] X^{2 +}$
B $[Cr (en) X_{2} Cl X_{2}] X^{+}$
C $[Mn (CN) X_{6}] X^{3 -}$
D $[Fe (CN) X_{6}] X^{4 -}$

Answer: A, B, C

Co:

x - 1 = + 2

gives

+ 3

. Cr:

x - 2 = + 1

gives

+ 3

. Mn:

x - 6 = - 3

gives

+ 3

. Fe:

x - 6 = - 4

gives

+ 2

, so it is not included.

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