Question

In the following experimental setup of electrolysis of water, if P and Q are the gases collected in the test tubes enclosing the electrodes R and S, then select the option/options in which the matching is correct: 
(i) P - Oxygen gas, R - Anode 
(ii) P - Hydrogen gas, S - Cathode 
(iii) Q - Hydrogen gas, R - Cathode 
(iv) Q - Oxygen gas, S - Anode 

• A. (i) and (ii)
• B. (iii) and (iv)
• C. (i) and (iii)
• D. (ii) and (iv)
  {5pt}

Hint:

During electrolysis, oxidation occurs at the anode (producing oxygen), and reduction occurs at the cathode (producing hydrogen).

Answer 1

The Correct Option is C

Step 1: Electrolysis Overview. During water electrolysis, oxygen gas (Osubscript{2}) forms at the anode (R), while hydrogen gas (Hsubscript{2}) forms at the cathode (S).
Step 2: Identifying Gases P and Q.
- \( P \) is oxygen gas, produced at the anode (R). \( P \) is therefore linked to oxygen and the anode.
- \( Q \) is hydrogen gas, produced at the cathode (S). \( Q \) is therefore linked to hydrogen and the cathode.
Step 3: Answer. The correct answer is (i) and (iii), matching option (C). {10pt}