Redox Reactions...

The oxidation states of the most electronegative element in the product of the reaction of $$Ba{ O }_{ 2 }$$ with dilute $${ H }_{ 2 }{ SO }_{ 4 }$$ are:

A compound contains atoms $$\mathrm { A } , \mathrm { B }$$ and $$\mathrm { C }$$ . The oxidation number of $$\mathrm { A }$$ is $$+ 2 ,$$ of $$\mathrm { B }$$ is $$+ 5$$ and of $$\mathrm { C }$$ is $$- 2 .$$ The possible formula of the compound is:

Consider the species given above.
The oxidation number of sulphur atom 1,2,3 and 4 respectively are

A : Electrochemical cell is based on redox reaction.
R : Electrochemical cell converts electrical energy into chemical energy.

When $$ Cl_2 $$ gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine changes from____ 

What is the oxidation number of $$N$$ in $$NH_2OH$$? 

What is the oxidation number of carbonyl carbon in acetaldehyde?

Oxidation state of oxygen in hydrogen peroxide is 

$$20\ cc$$ of a $$0.1\ M$$ solution of metal ions reacted with $$20\  \mathrm{cc}  $$ of $$0.1\ \mathrm{M}  $$ sulphur dioxide solution, according to the equation:
$$ \mathrm{SO}_{2}+2 \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{SO}_{4}^{2-}+4 \mathrm{H}^{+}+2 \mathrm{e}^{-} $$

Oxidation number of $$Cl$$ in $$CaOCl_{2}$$