Question

2pd
1. In the electrolysis of brine (which is 40% aqueous solution of NaCl by
mass) (ब्राइन के विद्युत अपघटन पर (जो NaCl का द्रव्यमान के आधार पर जलीय
विलियन है)- (i) Hydrogen gas librated at cathode and chlorine gas librated
at anode. (कैथोड पर हाइड्रोजन गैस व एनोड पर क्लोरीन गैस मुक्त होगी) (ii)
Hydrogen gas librated at anode and chlorine gas librated at cathode.
(कैथोड पर क्लोरीन गैस व एनोड पर हाइड्रोजन गैस मुक्त होगी) (i) This is an
example of endothermic reaction. (यह एक ऊष्माशोषी अभिक्रिया का उदाहरण है)
(iv) This is an example of exothermicreaction. (यह एक ऊष्माक्षेपी अभिक्रिया का
उदाहरण है) Which is the correct combination? (सही संकलन कौन सा है)
A)(1)& (iv)
B) (ii) & (111)
C) (11) & (iv)
D) (iii) &(1)​

Answer 1

Answer:

SUMMARY OF PRODUCTS FROM THE ELECTROLYSIS OF SODIUM CHLORIDE solution or melt with inert electrodes like carbon (graphite) or platinum

Electrolyte negative cathode product positive anode product

aqueous sodium chloride solution (brine) NaCl(aq) hydrogen chlorine gas

Answer 2

In the electrolysis of brine, Hydrogen gas is liberated at the cathode, and chlorine gas liberated at the anode and it is an example of an endothermic reaction. (Option i and iii)

• Electrolysis is the process of decomposing an ionic compound in the presence of an electric current.
• When brine solution (40% aqueous NaCl solution) is electrolyzed, negative ions (Cl⁻) are attracted to the positive electrode (anode) and Cl₂(g) is produced.
• While Hydrogen ions (H⁺) which are present in water, are attracted to the negative electrode (cathode), which leads to the formation of hydrogen gas, H₂(g).
• When energy is supplied to carry out the reaction, it is termed as an endothermic reaction. Since electrolysis involves the presence of electric energy, it is an endothermic reaction.