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 matching question between List I (Electrode) and List II (Type), we will analyze each electrode and determine its corresponding type step by step.

### Step-by-Step Solution:

1. **Calomel Electrode**:
- The calomel electrode is a type of reference electrode. It is represented by the chemical formula Hg2Cl2 in the presence of KCl.
- **Match**: Calomel (1) → Reference (P)

2. **Glass Electrode**:
- The glass electrode is known as a membrane electrode. It is commonly used for measuring pH levels.
- **Match**: Glass (2) → Membrane (R)

3. **Hydrogen Electrode**:
- The hydrogen electrode is classified as a gas electrode since it involves hydrogen gas in its operation.
- **Match**: Hydrogen (3) → Gas (S)

4. **Quinhydrone Electrode**:
- The quinhydrone electrode is a type of redox electrode, which is used in redox potential measurements.
- **Match**: Quinhydrone (4) → Redox (Q)

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

### Conclusion:
The correct order of matches is:
1. Calomel - Reference (P)
2. Glass - Membrane (R)
3. Hydrogen - Gas (S)
4. Quinhydrone - Redox (Q)

The correct option that represents this order is option 1.

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