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JEE Main levelSingle correct optionDifficulty 2 of 3eq130

20.0 mL of a solution needs 12.0 mL of 0.100 M HCl to reach the phenolphthalein end point. The molarity of the solution is:

  1. A
  2. B
  3. C
  4. D

Answer: D

At the phenolphthalein end point , so 1 mol needs 1 mol HCl. HCl = 0.100 12.0 = 1.20 mmol, so = 1.20 mmol in 20.0 mL = 0.0600 M.
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