Practical Chemistry Quiz-3

Oxidation of oxalic acid by acidified $KMnO_4$ is an example of autocatalysis, it is due to the presence of

In the preparation of $KMnO_4$ , pyrolusite ($MnO_2$) is first converted to potassium manganate ($K_2MnO_4$). In this conversion, the oxidation state of manganese changes from

Deep green precipitate of $Cr(OH)_3$ gives yellow solution on addition $H_2O_2$ in presence of excess of base. The yellow colour is due to

$K_2Cr_2O_7$ is preferred to $Na_2Cr_2O_7$ for use in volumetric analysis as a primary standard because

What would happen when a solution of potassium chromate is treated with an excess of dilute $HNO_3?$

The product of oxidation of $I^-$ with $MnO_4$ in alkaline medium is

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

$KMnO_4$ reacts with $Br^-$in alkaline $P^H$ to give

A student accidentally added conc.$H_2SO_4$ to potassium permanganate and it exploded due to the formation of an explosive which is

$KMnO_4$ gets reduced to