Question

Oxidation number of Co in [Co(NH₃)₃(H₂O)₂Cl]⁺ is:
a) 1
b) 2
c) 3
d) 4

Answer 1

hey mate option "d" 4

Answer 2

c) 3  

Let oxidation state of Co is X.

So X+ 6(-1) = -3

X - 6 = -3

X = +3

Hence Co having oxidation state +3

We can say by formula

[Co (CN) 6]^-3=

Suppose We Assume Co Oxidation No. a

A + 6(-1) = -3

a = 3

CO₂ replaces Chlorofluorocarbons as blowing agents for polystyrene foam and produces the natural fizz in beer. Supercritical CO₂