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Which of the following ions is a pollutant in drinking water even in trace amounts?

Which of the following ions is a pollutant in drinking water even in trace amounts?
Take Free Practice Test On 2026 JAMB UTME, Post UTME, WAEC SSCE, GCE, NECO SSCE
  • A Ca2+
  • B Hg2+
  • C Mg2+
  • D Fe2+
Correct Answer: Option B
Explanation:

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