In the reaction $SnCl_2(excess) + HgCl_2 \rightarrow A + SnCl_4$,'$A$' is

Which of the following will not change the orange colour of $K_2Cr_2O_7$ into green colour in an acidic medium?

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

The number of moles of $KMnO_4$ required to oxidize one equivalent of $KI$ in the presence of sulphuric acid is

Potassium permanganate works as an oxidising agent both in acidic and basic medium. In both states,the products obtained by $KMnO_4$ are respectively:

Assign $A, B, C, D$ from the given type of reaction.
$AgNO_3 \,(Solution) + NaF \,(Solution) \longrightarrow$ No reaction