Chemistry · Macromolecules
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The melting point of NaCl is very high, 801°C. It is reduced to 600°C by the addition of _______ in Down's process.
- A
Calcium chloride
- B
Magnesium chloride
- C
Aluminium chloride
- D
Potassium chloride
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.
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
MgCl increases the melting point instead of decreasing it, hence incorrect
AlCl is not used in downs process, hence it does not play any role in decreasing the melting point of NaCl. incorrect option
potassium chloride does not decrease the melting point of NaCl in downs process, hence incorrect
Tagged under Chemistry · Macromolecules · 2018