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1. What happens to the brine during electrolysis?
 
Electrolysis produces gases, and sodium hydroxide from a concentrated   solution known as brine. This is a important process in the industrial production of chlorine.
  
2. On heating, calcium carbonate gives calcium oxide and oxygen. Is it an exothermic reaction or an endothermic reaction?
 
On heating, calcium carbonate provides calcium oxide and oxygen; then, it is an reaction.