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Question

Which of the following is a method of preparation of CO2?


  1. By complete combustion of carbon

  2. By action of dilute mineral acids on carbonates.

  3. As a by-product from the manufacture of Hydrogen for making ammonia.

  4. None of these


Solution

The correct option is D

None of these


For this question, we have to take a look at the preparation methods of
CO2.

1. By complete combustion of carbon and carbon containing fuels in excess of air.

C(s)+O2(g)CO2(g)

CH4(g) + O2(g)CO2(g) + 2H2O(l)

2. In laboratory, CO2 is prepared by the action of dilute mineral acids on carbonates and bicarbonates.

CaCO3 + 2HCl CaCl2 + CO2 + H2O

NaHCO3 + HCl NaCl + CO2 + H2O

3. The main industrial source is as a by-product from the manufacture of hydrogen for making ammonia.

CO(g) + H2OCO2(g) + H2(g)

CH4(g) + 2H2OCO2(g) + 4H2(g)

4. It is also formed during fermentation process in breweries. .

C6H12O6Glucose or Fructose   Yeast under−−−−−−−−−−−−Anaerobic Conditions  2C2H5OH+2CO2Etghyl alcohol

5. By heating carbonates and bicarbonates of less electropositive metals:

ZnCO3 Na2CO3 + H2O + CO2

So, all options are correct.

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