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Question

Calcium hydroxide reacts with carbon dioxide to form.


A

Calcium carbonate and water.

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B

Calcium carbonate and hydrogen.

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C

Calcium bicarbonate and water.

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D

None of the above.

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Solution

The correct option is A

Calcium carbonate and water.


The explanation for the correct option.

  1. Calcium hydroxide Ca(OH)2 is a base and CO2 is acidic in nature
  2. As we know from the neutralization reaction that when acid and base react with each other, they form salt and water.
  3. Similarly, Calcium hydroxide Ca(OH)2 reacts with CO2 to form salt calcium carbonate CaCO3 and water H2O.

Ca(OH)2(aq)+CO2(g)CaCO3(s)+H2O(aq)Calciumhydroxidecarbondioxidecalciumwatercarbonate

The explanation for the incorrect option.

  1. The reaction between calcium hydroxide and carbon dioxide leads to the formation of Calcium Carbonate and water, no evolution of hydrogen gas (H2) and neither formation of calcium bicarbonate takes place. Therefore, other options are wrong.

Since the reaction between calcium hydroxide Ca(OH)2and carbon dioxide CO2 leads to the formation of Calcium Carbonate CaCO3 and water H2O, hence option (a) is correct.


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