# NEET Chemistry Redox Reactions Questions Solved

What is the oxidation number of Co in $\left[Co{\left(N{H}_{3}\right)}_{4}ClN{O}_{2}\right]$ [BHU 1999]

(1) + 2

(2) + 3

(3) + 4

(4) + 5

(1) $\left[\stackrel{\ast \text{\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}}}{Co}{\left(N{H}_{3}\right)}_{4}ClN{O}_{2}\right]$

$x+4\left(0\right)+1\left(-1\right)+1\left(-1\right)=0$

$x+0-1-1=0$

x – 2 = 0; x = +2.

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