Redox Reactions...

In which of the following compounds iron has lowest oxidation state :-

Which of the following, oxidation number of carbon is -1?

In which reaction, there is change in oxidation number of N atom ?

Reaction $$(A) S^{-2} + 4 H_2O_2 \rightarrow  SO^{2-}_4 + 4H_2O$$
$$(B)Cl_2 + H_2O_2 \rightarrow 2HCl + O_2$$
The true statement regarding the above reactions is :

The brown ring complex compound is formulated as $$[Fe(H_2O)_5NO]SO_4$$. The oxidation state of iron is:

Oxidation number of oxygen atom in  $$O_3$$ molecules is:

Which of the following is not a redox change ?

Which of the following is not a redox reaction ?

Sulphur has highest oxidation state in:

Heated saw dust catches fire when a drop of concentrated nitric acid is added to it. This is due to