A)
Compound
Oxidation state
\[\left[ Co{{\left( N{{H}_{3}} \right)}_{5}}Cl \right]C{{l}_{2}}\]
0
B)
Compound
Oxidation state
\[N{{H}_{2}}OH\]
-2
C)
Compound
Oxidation state
\[{{({{N}_{2}}{{H}_{5}})}_{2}}S{{O}_{4}}\]
+2
D)
Compound
Oxidation state
\[M{{g}_{3}}{{N}_{2}}\]
-3
Correct Answer: D
Solution :
[d] \[{{\left[ \overset{+3}{\mathop{Co}}\,{{\left( N{{\overset{0}{\mathop{H}}\,}_{3}} \right)}_{5}}\overset{-1}{\mathop{Cl}}\, \right]}^{+2}}\overset{-1\times 2}{\mathop{C{{l}_{2}}}}\,\] \[+3+5x+15-1=+2\] \[5x+17=+2\] \[5x=-15\] \[x=-3;\] Oxidation State of \[N=-3\] [b] \[N{{H}_{2}}OH:x+3-2=0\Rightarrow x=-1\] Oxidation state of \[N=-1\] [c] \[{{({{N}_{2}}{{H}_{5}})}^{+1}}S{{O}_{4}}^{2-}:\] \[{{N}_{2}}{{H}_{5}}^{+}:2x+5=+1\Rightarrow x=-2\] Oxidation number of \[N=-2\] [d] \[M{{g}_{3}}{{N}_{2}}:2\times 3+2x=0\] \[2x=-6\] \[x=-3\] Oxidation state of \[N=-3\]
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