In the process of photosynthesis, which takes place in green plants which undergoes reduction?

In alkaline solution ${\mathrm{KMnO}}_4$ reacts as follows

$2{\mathrm{KMnO}}_4+2\mathrm{KOH}\to 2{\mathrm{K}}_2{\mathrm{MnO}}_4+{\mathrm{H}}_2\mathrm{O}+\mathrm{O}$

Therefore, its equivalent weight will be

$\mathrm{n}$ factor of nitrobenzene in this process is

The reducing agent in the given reaction is

${\mathrm{Fe}}_2{\mathrm{O}}_3+2\mathrm{Al}\to {\mathrm{Al}}_2{\mathrm{O}}_3+2\mathrm{Fe}$

Consider the given reaction as balanced equation in acidic medium

$\mathrm{aCr}{\left(\mathrm{OH}\right)}_3+{\mathrm{blO}}_3^{-}+{\mathrm{cOH}}^{-}\to {\mathrm{dl}}^{-}+{\mathrm{aCrO}}_4^{2-}+{\mathrm{eH}}_2\mathrm{O}$.

The ratio of $\mathrm{b}$ to $\mathrm{a}$ is

The oxidation number of $\mathrm{C}$ marked as (1) and (2) in the compound

$\begin{array}{cccccc}\mathrm{O}& =& \mathrm{C}& =& \mathrm{C}& =\\ & & \left(1\right)& & \left(2\right)& \end{array}\begin{array}{ccc}\mathrm{C}& =& \mathrm{O}\\ \left(3\right)& & \end{array}$, respectively are