Question

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


a) Identify X,Y,G and Z.

b) Write all the three reactions involved.

✍Answer According to class 10
✍No spamming​

Answer 1

$\huge{\underline{\underline{\bf Question}}}$

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

• Identify X,Y,G and Z.
• Write all the three reactions involved.

$\huge{\underline{\underline{\bf Required \: Answer}}}$

Recognition of X,Y,G and Z

• $\sf X \: is \: Calcium \: Carbonate \: or \: CaCO_{3}$
• $\sf y \: is \: Calcium \: Hydroxide \: or \: Ca (OH)_{2}$

• $\sf G \: is \: Chlorine \: gas \: or \: Cl_{2}$
• $\sf Z \: is \: Bleaching \: powder \: (Calcium \: Oxychloride) \: or \: CaOCl_{2}$

Reactions involved are as follows:-

$\sf CaCO_{3} + 2HCl \longrightarrow CaCl_{2}+CO_{2}+H_{2}O$

• in this reaction, carbon dioxide gas is produced which reacts with Calcium Hydroxide (Slaked lime) to give back calcium carbonate.

$\sf CO_{2} + Ca(OH)_{2} \longrightarrow CaCO_{3}$

• Chlorine is a gas produced at anode during electrolysis of brine. It reacts with Slaked lime to produce bleaching powder

$\sf Ca(OH)_{2} + Cl_{2}\longrightarrow CaOCl_{2}$

________________________

hope u got what u were looking for ☺️

~answer by a 10th grader !!

Answer 2

Given :-

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

To Find :-

a) Identify X , Y , G and Z .

b) Write all the three reactions involved .

The answer should be only according to 10th Standard .

Used Concepts :-

• If a metal carbonate is heated with an acid then it always produces Carbon - di - oxide ( gas ) , Water and a corresponding salt .
• Bleaching powder is used for disinfecting water because presence of Chlorine in it .

Solution :-

Firstly , Electrolysis are of many types but you have said that answer should be according to only Class 10th , So we will apply only that Electrolysis that we have studied in Class 10th .

a )

As here it is given that the metal carbonate "X" when heated with an acid gives a gas which when passed through a solution "Y" gives carbonate back .

As we know that , if a metal carbonate reacts with an acid . So it produces Carbon dioxide gas obviously .

So , the solution "Y" will be slaked like / Calcium Hydroxide and "X" will be Calcium Carbonate .

On Checking :-

If Calcium Carbonate is heated with Hydrochloric acid . So , it produces water , Carbon dioxide gas and a corresponding salt and when carbon dioxide gas is passed through a solution of Calcium Hydroxide ( aqueous ) it gives Calcium Carbonate back and turns the solution Milky .

You can see from the above attachment that Chlorine gas is given off at anode in electrolysis of brine . So , "G" is Chlorine gas .But for that it is chlorine gas it should be applicable on the other case . Let , check this ,

If chlorine gas is passed through dry Slaked lime , It gives a compound "Z" Which is used for disinfecting water .

So , we have to find "Z" and if "Z" is used for disinfecting water . Then , we are done !

If chlorine gas is passed through dry Slaked lime then it produces bleaching powder ( Calcium oxy chloride ) which is also used as an disinfecting agent . And If a question arises how to prepare bleaching powder So, you can say that by passing chlorine gas in dry Slaked lime.

So , X = Calcium Carbonate

Y = Slaked Lime / Calcium Hydroxide

G = Chlorine gas

Z = Bleaching Powder / Calcium Oxy Chloride .

b ) For reactions kindly see the above attachments .

Note :- Brine is the aqueous solution of Sodium Chloride / Common Salt.