When $H_2S$ is passed through $Hg_2^{2+}$ solution,the products obtained are:

Auto-oxidation of bleaching powder gives

For the given reaction $Cl_2 + OH^{-} \to ClO^{-} + Cl^{-}$,select the correct sequence of $T$ (True) and $F$ (False) for the following statements:
$(1)$ The given reaction occurs in a basic medium.
$(2)$ $Cl_2$ undergoes both oxidation and reduction.
$(3)$ The reaction is a disproportionation reaction.
$(4)$ The oxidation state of $Cl$ in $ClO^{-}$ is $+1$.

Assign $A$,$B$,$C$,$D$ from given type of reaction.
$A$ for precipitate formation reaction.
$B$ for precipitate dissolution reaction.
$C$ for precipitate exchange reaction.
$D$ for no reaction.
$P_4 + 3NaOH + 3H_2O \longrightarrow PH_3 + 3NaH_2PO_2$
Identify the correct category for the given reaction.

Which of the following substances acts as an oxidising as well as a reducing agent?

$Cu^{+}$ ion is not stable in aqueous solution due to: