Match the list - I with List - II
`{:(,"List (Electrode)",,"List - II(Type)"),(1.,"Calomel",P.,"Reference"),(2.,"Glass",Q.,"Redox"),(3,"Hydrogen",R.,"Membrane"),(4.,"Quinhydrone",S.,"Gas"):}`

Options

A. 1-P,2-R,3-S,4-Q
B. 1-Q,2-P,3-S,4-R
C. 1-R,2-Q,3-P,4-S
D. 1-S,2-P,3-R,4-Q

Answer

To solve the problem of matching the electrodes from List I with their corresponding types from List II, we will analyze each electrode and determine its classification.

### Step-by-Step Solution:

1. **Identify the first electrode: Calomel**
- The calomel electrode is primarily used as a reference electrode in electrochemical cells.
- **Match:** Calomel → Reference (P)

2. **Identify the second electrode: Glass**
- The glass electrode is known for its use in measuring pH and is a type of ion-selective electrode that utilizes a glass membrane.
- **Match:** Glass → Membrane (R)

3. **Identify the third electrode: Hydrogen**
- The hydrogen electrode, specifically the standard hydrogen electrode (SHE), is used as a reference point for measuring electrode potentials. It involves a redox reaction.
- **Match:** Hydrogen → Redox (Q)

4. **Identify the fourth electrode: Quinhydrone**
- The quinhydrone electrode is used in redox reactions and is derived from the equilibrium between quinone and hydroquinone.
- **Match:** Quinhydrone → Redox (Q)

### Final Matches:
- 1. Calomel → P. Reference
- 2. Glass → R. Membrane
- 3. Hydrogen → Q. Redox
- 4. Quinhydrone → Q. Redox

### Summary of Matches:
- (1) Calomel - Reference (P)
- (2) Glass - Membrane (R)
- (3) Hydrogen - Redox (Q)
- (4) Quinhydrone - Redox (Q)