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Question
The products of chloro-alkali process are ______.
Options
NaCl, Cl2 and H2
H2, Cl2 and NaOH
Cl2, Na2CO3 and H2O
NaOH, Cl2 and HCl
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Solution
The products of chloro-alkali process are H2, Cl2 and NaOH.
Explanation:
The chlor-alkali process is the electrolysis of a concentrated aqueous solution of sodium chloride, commonly known as brine (NaCl + H2O). During electrolysis, chlorine gas (Cl2) is liberated at the anode, while hydrogen gas (H2) is released at the cathode. Sodium hydroxide (NaOH), an alkaline solution, is left behind in the electrolyte chamber, giving the process its name (chlor for chlorine and alkali for sodium hydroxide).
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The Salt Story
From: The New Indian Express 9 March 2021
The salt pans in Marakkanam, a port town about 120 km from Chennai are the third largest producer of salt in Tamil Nadu. Separation of salt from water is a laborious process and the salt obtained is used as raw materials for manufacture of various sodium compounds.
One such compound is Sodium hydrogen carbonate, used in baking, as an antacid and in soda acid fire extinguishers.
The table shows the mass of various compounds obtained when 1litre of sea water is evaporated.
| COMPOUND | FORMULA | MASS OF SOLID PRESENT /g |
| Sodium Chloride | NaCl | 28.0 |
| Magnesium Chloride | MgCl2 | 8.0 |
| Magnesium Sulphate | MgSO4 | 6.0 |
| Calcium Sulphate | CaSO4 | 2.0 |
| Calcium Carbonate | CaCO3 | 1.0 |
| TOTAL AMOUNT OF SALT OBTAINED | 45.0 | |
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