(a) Write the balanced chemical equation for the reaction of `Cl_(2)` with hot and concentrated `NaOH`. Is this reaction a disproportion reaction?
(b) when `HCl` reacts with finely powdered iron, it forms ferrous chloride and not ferric chloride. why?
Deduce the molecular shape of `BrF_(3)` on the basis of `VSEPR` theory.

Explanation

(a) `underset("Amm.")((NH_(4))_(2))underset("dichromate")(Cr_(2)O_(7)(s)) overset("heat")to N_(2)(g) +Cr_(2)O_(3)(s) +4H_(2)O(g)`
(b) `underset(("Cold and dilute"))(2NaOH(aq))+Cl_(2)(g) to NaCl(aq)+NaClO(aq) +H_(2)O(l)`
(c ) `underset("Mercuric chloride")(3HgCl_(2)(aq))+2PH_(3)(g) to underset("Mercuric phosphide")(Hg_(3)P_(2)(s))+6HCl(aq)`