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: Understanding the setup. In the electrolysis of water, at the anode (R), oxygen gas (Osubscript{2}) is released, and at the cathode (S), hydrogen gas (Hsubscript{2}) is released. 
Step 2: Assigning the correct gases to P and Q. 
- \( P \) corresponds to oxygen gas, which is released at the anode (R), so \( P \) should be associated with oxygen gas and anode. 
- \( Q \) corresponds to hydrogen gas, which is released at the cathode (S), so \( Q \) should be associated with hydrogen gas and cathode. 
Step 3: Conclusion. Thus, the correct matching is (i) and (iii), corresponding to option (C). {10pt}