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JEE Main levelSingle correct optionDifficulty 2 of 3pb189

When is passed continuously through lime water, the milkiness first appears and then disappears. The clear solution contains

  1. A
  2. B regenerated
  3. C dissolved in water
  4. D

Answer: A

First gives milkiness. With excess : , which is soluble, so the solution turns clear.
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