Redox Reactions...

The oxidation of toluene with $CrO_3$ in the presence of $(CH_3CO)_2O$ gives a product A, which on treatment with aqueous $NaOH$, produces?

A gas X at 1 atm is bubbled through the solution containing a mixture of 1MY and 1MZ  at 25 degrees. If the order of reduction potential is Z > Y > X, then 

The complex compound in which metal is not present in zero oxidation state?

From the following half-cell reaction and their potential, What is the smallest possible standard e.m.f spontaneous reaction?
${ PO }_{ 4 }^{ 3- } (aq) + 2H_2O(I) + 2e^-  \longrightarrow { HPO }_{3}^{2-} + 3OH^-(aq);  E^o = -1.05 V$
$PbO _2(s) + H_2O(I) + 2e^-  \longrightarrow PbO(S) + 2OH^-(aq);  E^o = +0.28 V$
$IO{-}{3}(aq) + 2H_2O(I) + 4e^- \longrightarrow IO^-(aq) + 4OH^-(aq);  E^o = +0.56 V$

In which of the following compounds, the metal is in the lower oxidation state

$H_2SO_4$ acts as a strong oxidising agent. In which of the reaction, it is not acting as an oxidising agent?

Which is not a redox reaction?

Fe shows an oxidation state of $+1$ in:

What is the oxidation number of $Cl$ in the $ClO^{-}_3$ ion? 

In which of the compounds does hydrogen have an oxidation state of - 1 ?