Multiple choice

The figure illustrates the conductmetric titration of hydrochloric acid against sodium hydroxide. The conductance at B is due to

  1. Sodium and chloride ions

  2. Sodium and hydroxide ions

  3. Hydrogen and chloride ions

  4. H2O molecules
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A Correct answer
Explanation

In conductometric titration of HCl against NaOH, at the equivalence point (B) and beyond, the solution contains Na+ and Cl- ions (from the neutralization reaction) and excess OH- ions. The conductance at B is primarily due to Na+ and Cl- ions present as products of the neutralization. Initially, H+ and Cl- contribute; after neutralization, Na+ and Cl- remain.

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