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Q.
$ MnO_{2} $ and $ H_{2}SO_{4} $ are added to $NaCl$. The greenish yellow gas liberated is
AMUAMU 2007
Solution:
Chlorine, the yellowish-green gas with sufocating odour is evolved when the solid sodium chloride mixed with manganese dioxide, is heated with concentrated $H _{2} SO _{4}$.
$NaCl + H _{2} SO _{4} \longrightarrow NaHSO _{4}+ HCl $
$ MnO _{2}+4 HCl \longrightarrow MnCl _{2}+2 H _{2} O + Cl _{2}$