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NEET levelSingle correct optionDifficulty 1 of 3ec207

In the conductometric titration of HCl with NaOH (NaOH added from the burette), the conductance of the solution

  1. Adecreases, reaches a minimum at the end point and then increases
  2. Bincreases, reaches a maximum at the end point and then decreases
  3. Cincreases continuously throughout the titration
  4. Dremains nearly constant up to the end point and then increases

Answer: A

Before the end point, highly mobile ions () are replaced by less mobile ions (), so conductance falls. At the end point only NaCl is present and conductance is minimum. Beyond it, excess and highly mobile () accumulate, so conductance rises sharply. The curve is V-shaped.
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