$KMnO_4$ (acidified) $+ HCl \rightarrow H_2O + X_{(g)},$ $X$ is a

Which of the following species is both basic and a reducing agent?

Explain the uses of indicators in the analysis of redox reactions.

In the reaction of phosphorus with concentrated $HNO_3$,the oxidized and reduced products respectively are

Consider the following list of reagents:
Acidified $K_2Cr_2O_7$,alkaline $KMnO_4$,$CuSO_4$,$H_2O_2$,$Cl_2$,$O_3$,$FeCl_3$,$HNO_3$ and $Na_2S_2O_3$. The total number of reagents that can oxidise aqueous iodide to iodine is

Assign $A$,$B$,$C$,$D$ from the given type of reaction.
$KNO_2 + AgF \longrightarrow AgNO_2 \downarrow + KF$