Q. 44.5( 4 Votes )

In one of the industrial processes used for manufacture of sodium hydroxide, a gas X is formed as by-product. The gas X reacts with lime water to give a compound Y which is used as a bleaching agent in chemical industry. The compound X and Y could be
A. H2 and NaHCO3, respectively

B. CO2 and CaOCl2 respectively

C. Cl2 and CaOCl2 respectively

D. Cl2 and NaHCO3 respectively

Answer :

The process includes the following steps:


Step 1: Preparation of sodium hydroxide:


When a concentrated solution of sodium chloride is electrolyzed, it forms sodium hydroxide (NaOH), chlorine gas and hydrogen gas.


Chlorine gas (X) is formed at anode (positive charge) and hydrogen gas at cathode (negative charge)


The reaction takes place is given as:


2NaCl + 2H2O 2NaOH + Cl2 + H2


Note: The above reaction is called chlor-alkali process.



Step 2: Now, chlorine gas (X) reacts with lime water [Ca(OH)2] to form a compound (Y) that is bleaching powder which is used as bleaching agent in chemical industry.


The reaction that takes place is:



Thus, X is chlorine gas and Y is bleaching powder (CaOCl2)

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