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NEET levelSingle correct optionDifficulty 1 of 3cc094

The oxidation state of cobalt in the complex ion $[Co (NH X_{3}) X_{5} Cl] X^{2 +}$ is

A+2
B+3
C+1
D+5

Answer: B

NH3 is neutral and chloride is

- 1

. Let Co be

x

:

x + 5 (0) + (- 1) = + 2

, so

x = + 3

.

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