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JEE Main202310 Apr 2023Morning ShiftChemistrys Block ElementsActual

Lime reacts exothermally with water to give ‘ A ’ which has low solubility in water. Aqueous solution of ‘ A ’ is often used for the test of CO 2 , a test in which insoluble B is formed. If B is further reacted with CO 2 then soluble compound is formed. ‘ A ' is

Options

  1. AQuick lime
  2. BSlaked lime
  3. CWhite lime
  4. DLime water

Correct answer

B. Slaked lime

Step-by-step solution

CaO Lime → Limited   water Ca OH 2 The process is known as slaking of lime and the product is slaked lime. It is an exothermic process. Ca OH 2 aq solution is known as lime water and used for test of CO 2 . Ca OH 2 aq → CO 2 CaCO 3 CaCO 3 + CO 2 excess + H 2 O → Ca HCO 3 2 Milkiness is due to the formation of calcium carbonate and disappearance of milkiness is due to the formation of calcium bicarbonate.

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