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A metal carbonate X on reacting with acid and gives a gas which when passed through a solution Y gives the carbonate back. On the other hand, a gas G that is obtained at the anode during electrolysis of brine is passed on dry Y, and it gives a compound Z, used for disinfecting drinking water. Identity X, Y, G, and Z.


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Solution

Calcium:

  • Calcium is a metal having an atomic number 20 and atomic symbol Ca.

Reaction of Calcium carbonate with acid:

  • When Calcium carbonate (CaCO3) reacts with Hydrochloric acid (HCl), it produces Calcium chloride (CaCl2) along with the liberation of carbon dioxide(CO2) and water(H2O).
  • The chemical reaction can be depicted as:

CaCO3(s)+HCl(aq)CaCl2(aq)+CO2(g)+H2O(l)

Reaction of CO2 with slaked lime:

  • When carbon dioxide gas is passed through Slaked lime or Calcium hydroxide (CaOH2), it gives calcium carbonate (CaCO3).
  • The chemical reaction can be depicted as:

Ca(OH)2(aq)+CO2(g)CaCO3(aq)+H2O(l)

Electrolysis of brine solution:

  • Brine solution is a solution of sodium chloride (NaCl) and water (H2O).
  • The gas that is obtained at the anode during electrolysis of brine is passed on dry slaked lime is Chlorine gas.
  • The reaction taking place at the anode is depicted as:
  • 2Cl-(aq)Cl2(g)+2e-

Reaction of chlorine gas with dry lime water:

  • Lime water is Calcium hydroxide (CaOH2).
  • When chlorine gas is passed on dry lime water, it gives bleaching powder which is used for disinfecting water.
  • When dry chlorine gas is passed over the dry slaked lime, calcium oxychloride(CaOCl2) is formed.
  • The chemical reaction can be depicted as:

Ca(OH)2(s)+Cl2(g)CaOCl2(aq)+H2O(l)

Hence, X is calcium carbonate (CaCO3), Y is slaked lime (CaOH2), Z is bleaching powder (CaOCl2), and G is chlorine gas (Cl2).


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