Which of the following combination of reagents will reacts to give chlorine gas?
A. Sodium chloride, conc. \(H _{2} SO _{4}\) and Manganese (IV) oxide B. Potassium tetraoxomangante C. Potassium trioxochloide (V) and conc. \(H _{2} SO _{4}\) D. Potassium tetraoxomangante (VI) and conc. \(H _{2} SO _{4}\)
Correct Answer: A
Explanation
Chlorine is prepared in the laboratory by heating sodium chloride in concentrated sulphuric acid \(\left( H _{2} SO _{4}\right)\) in the presence of manganese (IV) oxide. The equation of \(MnO _{2(0)}+2 H _{2} SO _{4(\text { (a) })}+2 NaCl _{(x q)} \rightarrow MnSO _{4(\text { (a) })}+ Na _{2} SO _{4(\text { (aq) }}+2 H _{2} O _{(0)}+ Cl _{2(8)}\)