The gas evolved in which of the following reactions forms the iodide of Millon's base…

CHEMISTRY · Single correct · ICSE · Chemistry · Study of Compounds · Study of Compounds

Problem

The gas evolved in which of the following reactions forms the iodide of Millon's base on being passed through a solution of

[HgI_4]^{2-}

in KOH? (1)

CaSO_4

treated with dilute

HCl

(2)

NH_4Cl

boiled with

NaOH

(3)

ZnS

treated with dilute

H_2SO_4

(4)

MgCO_3

heated alone