Write balanced chemical equations for the following:
$(i)$ $NaCl$ is heated with concentrated sulphuric acid $(H_{2}SO_{4})$ in the presence of manganese dioxide $(MnO_{2})$.
$(ii)$ Chlorine gas $(Cl_{2})$ is passed into an aqueous solution of sodium iodide $(NaI)$.
$(i)$ $NaCl$ is heated with concentrated sulphuric acid $(H_{2}SO_{4})$ in the presence of manganese dioxide $(MnO_{2})$.
$(ii)$ Chlorine gas $(Cl_{2})$ is passed into an aqueous solution of sodium iodide $(NaI)$.
(N/A) $(i)$ $4NaCl + MnO_{2} + 4H_{2}SO_{4} \longrightarrow MnCl_{2} + 4NaHSO_{4} + 2H_{2}O + Cl_{2}$
$(ii)$ $Cl_{2} + 2NaI \longrightarrow 2NaCl + I_{2}$
$(ii)$ $Cl_{2} + 2NaI \longrightarrow 2NaCl + I_{2}$
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