Question

Match the following and choose the correct option given below. Compound/Type \quad Use A. Dry ice 1. Anti-knocking compound B. Semiconductor 2. Electronic diode or triode C. Solder 3. Joining circuits D. TEL 4. Refrigerant for preserving food

• A. A B C D
• B. I II III IV
• C. II III IV I
• D. IV III II I

Hint:

Dry ice, semiconductors, solder, and TEL are all important substances used in various industrial and technological applications.

Answer 1

The Correct Option is D

Step 1: Identifying the correct pairs.
- Dry ice (solid CO\(_2\)) is used as a refrigerant, matching with 4. - Semiconductor is used in electronic devices, matching with 2. - Solder is used for joining circuits, matching with 3. - TEL (Tetraethyl lead) is used as an anti-knocking compound, matching with 1.

Step 2: Conclusion.
The correct match is IV III II I, corresponding to option (4).