CBSE Class 10 Science 2019 · Paper 31/2/1 · Question 7(b)
How is sodium hydroxide manufactured in industries ? Name the process. In this process a gas X is formed as by-product. This gas reacts with lime water to give a compound Y, which is used as a bleaching agent in the chemical industry. Identify X and Y and write the chemical equation of the reactions involved.
Answer
Electrolysis of brine (chlor-alkali process) gives sodium hydroxide; the by-product X is chlorine, which forms bleaching powder Y with slaked lime.
Sodium hydroxide is manufactured by passing electricity through brine (a concentrated aqueous solution of sodium chloride). The process is called the chlor-alkali process.
X is chlorine gas, , given off at the anode. With calcium hydroxide (slaked lime, as in lime water) it forms Y, bleaching powder, :
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