The effluent of an industrial plant used in the electrolysis of concentrated brine, with a flowing mercury cathode may obtain impurities like

Kingsley Thompson December 21, 2025

The effluent of an industrial plant used in the electrolysis of concentrated brine, with a flowing mercury  cathode may obtain impurities like

A. oxygen

B. hydrogen

C. mercury(II) chloride

D. hydrogen chloride 

The correct answer is C. mercury(II) chloride

Explanation

In the electrolysis of concentrated brine using a flowing mercury cathode (Castner–Kellner process), a major environmental concern is mercury contamination.

Mercury used at the cathode can react and form toxic mercury compounds, which may appear in the effluent.

Check the options:

  • A. Oxygen → not produced in brine electrolysis ❌

  • B. Hydrogen → hydrogen is not liberated at a mercury cathode ❌

  • C. Mercury(II) chloride → toxic mercury compound that can contaminate the effluent ✅

  • D. Hydrogen chloride → not an effluent impurity ❌

✅ Correct Answer: C. mercury(II) chloride

NUMBER FIFTEEN 
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Kingsley Thompson

Posted by: Kingsley Thompson

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