Which gas is produced in the chlor -alkali process ?

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Oxygen gas

Carbon dioxide gas

Chlorine gas

Both 2 and 3.

answer is C.

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Detailed Solution

Concept- The industrial manufacturing process for NaOH involves electrolysis of brine which is basically common salt dissolved in water. The process is chlor-alkali process.
Brine is basically NaCl(aq) and its electrolysis leads to its decomposition for which the chemical reaction can be written as follows:

As it is evident that during manufacturing of NaOH that it is an alkali,

gas is also produced as a by-product giving the name chlor-alkali to the process. So, we can conclude that Chlorine gas,

, is released.
This gas,

reacts with lime water for which we have chemical formula

and the reaction between the two can be shown by the following chemical equation:

Hence, the correct option is (3).

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