Write two uses of $KMnO_4$ and $K_2Cr_2O_7$.

(N/A) $KMnO_4$ (Potassium permanganate) is used as:
$1$. An oxidizing agent in laboratory and industrial processes.
$2$. $A$ disinfectant and germicide in water treatment.
$K_2Cr_2O_7$ (Potassium dichromate) is used as:
$1$. $A$ primary standard in volumetric analysis.
$2$. An oxidizing agent in the manufacture of azo compounds and in the leather industry for chrome tanning.