Before adding the reagents of group III, the solution is heated with some concentrated \( \mathr....

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Before adding the reagents of group III, the solution
\( \mathrm{P} \)
is heated with some concentrated \( \mathrm{HNO}_{3} \) in order to:
(1) Increase the \( \mathrm{NO}_{3}^{-} \)
(2) Lower the \( \mathrm{pH} \)
(3) Oxidize \( \mathrm{Fe}^{2+} \) to \( \mathrm{Fe}^{3+} \)
(4) Oxidize \( \mathrm{Cr}^{3+} \) to \( \mathrm{Cr}_{2} \mathrm{O}_{7}^{2-} \)


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