Chromite ore is processed through the following sequence: \[ \begin{array}{l} \mathrm{FeCr}_{2} ...

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Chromite ore is processed through the following sequence:
\[
\begin{array}{l}
\mathrm{FeCr}_{2} \mathrm{O}_{4} \stackrel{\mathrm{Na}_{2} \mathrm{O}_{2}}{\mathrm{Fuse}}\{(\mathrm{M})+(\mathrm{N})\} \stackrel{\text { Boil }}{\underset{\mathrm{H}_{2} \mathrm{O}}{\longrightarrow}} \mathrm{N} \text { (aq.) } \stackrel{\text { excess } \mathrm{H}^{+}}{\longrightarrow}(\mathrm{O}) \\
\mathrm{H}_{2} \mathrm{O}_{2}
\end{array}
\]
In this sequence how many species (from \( \mathrm{M} \) to \( \mathrm{T} \) ) show green colour?
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