Chlorine gas is prepared in the laboratory by
-
adding concentrated hydrochloric acid to solid manganese (IV) oxide
- aciding concentrated tetraoxosulphate (VI) acid to solid sodium chloride
- dropping concentrated hydrochloric acid onto potassium tetraoxomanganate (VI) crystals
- aciding concentrated tetraoxosulphate (VI) acid to hydrochloric acid
The correct answer is: A
Explanation
Chlorine gas is prepared in the laboratory by adding an oxidizing agent e.g. \(MnO_2\), \(PbO_2\), or \(KMnO_4\) on concentrated hydrochloric acid.
\(MnO_{2(s)}\) + 4\(HCl_{aq}\) → \(MnO_{2(aq)}\) + 2\(H_2O_{(l)}\) + \(Cl_{2(g)}\)