The melting point of NaCl is very high, 801°C. It is reduced to 600°C by the addition of _ in Down's process.
Correct answer: A. Calcium chloride
- A. Calcium chloride
- B. Magnesium chloride
- C. Aluminium chloride
- D. Potassium chloride
Explanation
Sodium chloride melts at a very high temperature. A mixture containing(NaCl+CaCl2) is used to decrease the melting point. The main reasons for lowering the temperature are:a) Sodium is volatile at this temperature and so a part of the metal formed may vaporize.b) At this high temperature, sodium and chlorine produced corrode the vessel.Calcium chloride, CaCl2, is added to lower the melting point of the cell medium from the normal melting point of NaCl, 804oC, to around 600oC.
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