Question:

When excess of carbon dioxide is passed through lime water, the milkiness first formed disappears due to

Updated On: Jul 7, 2022
  • the reversible reaction taking place
  • formation of water soluble calcium bicarbonate
  • huge amount of heat evolved during the reaction
  • formation of water soluble complex of calcium
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The Correct Option is B

Solution and Explanation

When excess of carbon dioxide is passed in lime water, calcium carbonate is converted to calcium bicarbonate which is soluble, hence the milkiness due to calcium carbonate disappears. $Ca(OH)_{2} +CO_{2} \to$ $\underset{\text{Milkiness}}{ {CaCO_{3}}}$ $? $CaCO_{3} + H_{2}O +CO_{2} \to$$\underset{\text{soluble}}{ {Ca(HCO_{3})_{2}}}$
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Concepts Used:

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  • P block elements are those in which the last electron enters any of the three p-orbitals of their respective shells. Since a p-subshell has three degenerate p-orbitals each of which can accommodate two electrons, therefore in all there are six groups of p-block elements.
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