Question

A metal carbonate “X” on reacting with an acid gives a gas which when passed through a solution “Y” gives the carbonate back. On the other hand , a gas “G” that is obtained during electrolysis of brine is passed on dry “Y” . It gives a compound “Z” , used for disinfecting drinking water. Identify X,Y,Z,G.
a. Sodium carbonate, antacid, oxygen , bleaching powder
b. Calcium Carbonate , lime water, chlorine, bleaching powder
c. Sodium Carbonate, vinegar , hydrogen , chlorine gas
d. Calcium Carbonate , lime water , nitrogen , chlorine gas

Answer 1

↘️ So, let's start reacting the chemical substances and form the compounds.

First of all, A metal carbonate on reacting with an acid, Carbon dioxide(Co2) is liberated. When, Carbon dioxide is passed over Slaked lime solution/Lime water, a precipitate is formed which is the earlier metal carbonate.

So, we can conclude that

$\large{\boxed{\sf{CaCo_3 + HCl \longrightarrow CaCl2 + Co_2 + H_2O}}}$

Here, HCl is taken as optional acid by me. It is just to show the reaction that Co2 is liberated as a result.

Then, Carbon dioxide is passed over lime water/slaked lime solution.

$\large{\boxed{\sf{Ca(OH)_2 + Co_2 \longrightarrow CaCO_3}}}$

On the other hand, an another elecryolytic recation is conducted. In which, Sodium chloride solution, popularly known as Brine solution is decomposed into Sodium and Chlorine gas.

$\large{\boxed{ \sf{NaCl \longrightarrow 2Na + Cl_2}}}$

This Chlorine gas is reacted with Lime water/ Slaked lime solution to form Calcium Oxychloride(Bleaching powder).

$\large{\boxed{\sf{Ca(OH)_2 + Cl_2 \longrightarrow CaOCl_2 + H_2O}}}$

➤ Bleaching powder is used in disinfecting polluted water.

So, our final conclusion:

• Metal carbonate 'X' is Calcium carbonate used here.
• Solution 'Y' is slaked lime/Lime water solution.
• Gas 'G' obtained after the electrolysis of Brine solution is Chlorine gas.
• And, Compound 'Z' formed is Calcium Oxychloride/Bleaching powder.

$\large{\underline{\underline{\bf{\purple{Correct \:Answer\: is:}}}}}$

Calcium carbonate, Lime water, Chlorine gas and Bleaching powder (Option B)

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Answer 2

Calcium carbonate, Lime water, Chlorine gas and Bleaching powder (Option B)

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