Silver nitrate is mainly used

Identify the statement which is not correct regarding copper$(II)$ sulphate.

The purple colour of $KMnO_4$ is due to the transition:

Fill in the blanks:
$(1)$ ......... acid is added to perform titrations with $KMnO_4$ and $K_2Cr_2O_7$.
$(2)$ Crystals of potassium dichromate are of ......... color,while crystals of potassium chromate are of ......... color.
$(3)$ The color of $MnO_4^{2-}$ is ......... and the color of $MnO_4^-$ is ......... .

Which product is formed by the reaction of an acidic solution of chromic acid with hydrogen peroxide?

Which compounds are formed when $Mn_2O_7$ and $CrO_3$ react with water,given that they are acidic in nature?