Write balanced equation for the following:
(i). `NaCl` is heated with sulphuric acid in the presence of `MnO_2`.
(ii). Chlorine gas is passed into a solution of NaI in water.

Explanation

(i) `Cl_(2)` is produced.
`{:(" "NaCl + H_(2)SO_(4) rarr [NaHSO_(4)+HCl] xx 4),(" "4 HCl + MnO_(2) rarr MnCl_(2)+Cl_(2)+2H_(2)O),(bar(4NaCl + MnO_(2)+4H_(2)SO_(4) rarr MnCl_(2) + 4 NaHSO_(4) + Cl_(2)+2H_(2)O)):}`
(ii) `Cl_(2)` being an oxidising agent oxidises Nal to `I_(2)`
`Cl_(2)(g) + 2 Nal (aq) rarr 2 NaCl (aq) + I_(2) (s)`