CBSE Class 10 Science 2019 · Paper 31/5/2 · Question 5(a)
What is brine ? What happens when an electric current is passed through it ? Write chemical equation for it.
Answer
Brine is concentrated aqueous sodium chloride; electrolysis gives sodium hydroxide, chlorine and hydrogen: .
Brine is a concentrated aqueous solution of sodium chloride (common salt), .
When an electric current is passed through brine, it decomposes to form sodium hydroxide, chlorine gas and hydrogen gas: chlorine is given off at the anode, hydrogen at the cathode, and sodium hydroxide solution is formed near the cathode. This is the chlor-alkali process.
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