What is the number of electrons gained by $Cl$ atom when $n$ mole of $ClO_4^-$ is transformed into $n$ mole of $ClO_2^-$ ion?

Which product is obtained during the reaction of $MnO_4^-$ with $I^-$ in a faintly alkaline condition?

Assign $A$,$B$,$C$,$D$ from the given type of reaction.
$Ca(OH)_2 + SO_2 \longrightarrow CaSO_3 \downarrow + H_2O$

How many moles of electrons are required to reduce $2.5 \ mol$ of $Cr_2O_7^{2-}$ to $Cr^{3+}$?

In alkaline condition $KMnO_4$ reacts as follows:
$2KMnO_4 + 2KOH \to 2K_2MnO_4 + H_2O + O$
Therefore,its equivalent weight will be:

Assertion: Change in color of acidic solution of potassium dichromate by breath is used to test drunk drivers.
Reason: Change in color is due to the complexation of alcohol with potassium dichromate.