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A cold aqueous solution of sodium chloride is electrolyzed using a graphite anode and an...

Chemistry
JAMB 1980

A cold aqueous solution of sodium chloride is electrolyzed using a graphite anode and an iron cathode. In the course of the electrolysis the electrolyte is continuously stirred. The liquid left after electrolysis will therefore consist of?

  • A. sodium hydroxide solution
  • B. chlorine water
  • C. pure water
  • D. sodium hypochlorite solution
  • E. hydrochloric acid solution
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Correct Answer: Option A
Explanation

we take cold aqueous to be concentrated solution of NaCl.

NaCl → \(Na^+    + Cl^-\)

 \(H_2O → H^+   + OH^-\)

H ion will be preferably discharged at the cathode while Cl ion will be discharged at the anode(due to high concentration)

Thus, NaOH is left in the solution.


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