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GATE 2022 ES – Question 15

Environmental Chemistry · Principles of Water Chemistry · 1 mark · Multiple choice

Specific conductance indirectly estimates dissolved solids in water. Which species contribute to the measurement?

  1. Cations only
  2. All ions
  3. Anions only
  4. Un-ionized species

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Correct answer: (B) All ions

Explanation

Both positively and negatively charged ions carry electrical current through the solution. Conductivity therefore reflects **all ions, B**, weighted by concentration, charge and mobility. It does not directly measure neutral dissolved substances, so a conductivity-to-total-solids conversion is approximate.

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