Redox Reactions...

The sum of oxidation number of nitrogen in $$NH_4NO_3$$ is:

The oxidation number of cobalt in $$K[Co(CO)_4]$$ is:

Oxalic acid dihydrate, $$H_{2}C_{2}O_{4}\cdot 2H_{2}O(s)$$ is often used as a primary reagent to standardise sodium hydroxide solution. Which of these facts are reasons to choose this substance as a primary standard?
I. It is diprotic.
II. It is a stable compound that can be weighed directly in air.
III. It is available in pure form.

The oxidation number of sulphur in $$H_2S_2O_8$$ is:

Oxidation state of phosphorus in cyclotrimetaphosphoric acid is:

A compound of Xe and F is found to have $$53.5\%$$ Xe. What is the oxidation number of Xe in this compound?

The value of n in the molecular formula $$Be_nAl_2Si_6O_{18}$$ is:

Of the following reactions, only one is a redox reaction. Identify this reaction.

When $$6 \times 10^{22}$$ electrons are used in the electrolysis of a metalic salt, 1.9 gm of the metal is deposited at the cathode The atomic weight of that metal Is 57. So oxidation state of the metal in the salt is:

Which of the following is not a redox reaction?