1.

Write briefly about the three methods of electrolysis of sodium chloride.

Answer»
  • When an electric current is passed through a saturated solution of sodium chloride (brine) it is electrolysed and hydrogen gas is released at the cathode while chlorine gas is released at the anode. 
  • This method is used for production of chlorine gas. In this method an important basic compound NaOH is formed in the cell. 
  • Chemical reaction

2NaCl + 2H2O → 2NaOH + Cl2 ↑ + H2 ↑

  • When salt is heated to a high temperature (about 800°C), it melts. This is called the fused state of the salt.


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