Class 8 Exam > Class 8 Questions > Which of the following gas is formed at the e... Start Learning for Free
Which of the following gas is formed at the electrode connected to the negative terminal of the battery?
- a)Nitrogen gas
- b)Hydrogen gas
- c)Oxygen gas
- d)Carbon dioxide gas
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
Which of the following gas is formed at the electrode connected to the...
Understanding the Electrolysis Process
In electrolysis, an electric current is passed through a solution or molten substance, causing it to decompose into its constituent elements. The electrodes play a crucial role in this process.
Electrodes and Their Functions
- Anode: The positive electrode where oxidation occurs.
- Cathode: The negative electrode where reduction occurs.
Gas Formation at the Cathode
When a battery is connected to an electrolyte solution, during electrolysis:
- At the Cathode: Reduction takes place. If the electrolyte is a solution of water or an acid, hydrogen ions (H+) from the solution gain electrons and are reduced to form hydrogen gas (H2).
- Chemical Reaction: The reaction at the cathode can be simplified as:
- 2H+ + 2e- → H2 (gas)
Why Hydrogen Gas is Formed
- Electrolyte Type: In most common electrolytes (like water with a small amount of acid), hydrogen ions are readily available.
- Electrode Reaction: The cathode attracts positive ions, leading to the production of hydrogen gas through the reduction of hydrogen ions.
Conclusion
Thus, when a battery powers the electrolysis process, the gas formed at the electrode connected to the negative terminal (cathode) is indeed hydrogen gas (option B).
In electrolysis, an electric current is passed through a solution or molten substance, causing it to decompose into its constituent elements. The electrodes play a crucial role in this process.
Electrodes and Their Functions
- Anode: The positive electrode where oxidation occurs.
- Cathode: The negative electrode where reduction occurs.
Gas Formation at the Cathode
When a battery is connected to an electrolyte solution, during electrolysis:
- At the Cathode: Reduction takes place. If the electrolyte is a solution of water or an acid, hydrogen ions (H+) from the solution gain electrons and are reduced to form hydrogen gas (H2).
- Chemical Reaction: The reaction at the cathode can be simplified as:
- 2H+ + 2e- → H2 (gas)
Why Hydrogen Gas is Formed
- Electrolyte Type: In most common electrolytes (like water with a small amount of acid), hydrogen ions are readily available.
- Electrode Reaction: The cathode attracts positive ions, leading to the production of hydrogen gas through the reduction of hydrogen ions.
Conclusion
Thus, when a battery powers the electrolysis process, the gas formed at the electrode connected to the negative terminal (cathode) is indeed hydrogen gas (option B).
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Community Answer
Which of the following gas is formed at the electrode connected to the...
On electrolysis of water Oxygen bubbles are formed on the electrode connected to the positive terminal of the battery and hydrogen bubbles formed on the other electrode.
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