Question

Gases X and Y are liberated at cathode and anode respectively during the electrolysis of water . Oxide of gas X further combines with the gas exhaled during the respiration to form a compound Z. Compound Z is
: 1 : CaCO3 , 2 : H2CO3, 3: H2O , 4: HCL

Which is correct?
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Answer 1

Answer:

H2CO3

Explanation:

Gas X is Hydrogen,  Gas Y is Oxygen as Oxygen has valence of 2-.

Oxide of H2 = H2 + O2 -----> 2H2O

Carbon di Oxide is given out during respiration

H2O + CO2 ----> H2CO3     ( Carbonic Acid)

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Answer 2

The compound Z in the given case is $H_2CO_3$. (option 2)

• During the electrolysis of water, water decomposed using electricity into $H_2$ and $O_2$.
• The reaction at cathode and anode is as follows

        2$H_2O$(l) + 2e–  ----$>$  $H_2$ (g) + 2$OH^-$ (at cathode)

        2 $H_2O$ ----$>$ $O_2$ (g) + 2$H_2$  (at anode)

• So, gases X is $H_2$ and gas Y is $O_2$.
• Oxide of $H_2$ is $H_2O$ which combines with $CO_2$, the gas we exhale in the process of respiration, to form $H_2CO_3$.

Hence, we can conclude that the compound Z in the given question is $H_2CO_3$. (option 2)

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