Redox Reactions...

The oxidation number of $$C$$ in $${CO}_{2}$$ is

The oxidation number of $$Fe$$ and $$S$$ in iron pyrites are

The oxidation number of $$Ba$$ in barium peroxide is

$${Sn}^{2+}$$ loses two electrons in a reaction. What will be the oxidation number of tin after the reaction?

The sum of the oxidation numbers of all the carbons in $${C}_{6}{H}_{5}CHO$$ is

In which of the following compounds the oxidation number of carbon is maximum?

Oxidation number of $$As$$ atoms in $${H}_{3}As{O}_{4}$$ is

If $$H{NO}_{3}$$ changes into $${N}_{2}O$$, the oxidation number is changed by

Which of the following reaction is a redox reaction?

Oxidation number of osmiium $$(Os)$$ in $$Os{O}_{4}$$ is