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Directions (Q. 140-143): The following questions are based on the Table given below. You are to match List-I with List-II, List-III, and List-IV, and select the correct answer using the code given below:
| List-I (Material) | List-II (Property/Process) | List-III (Structure/Composition) | List-IV (Uses/Features) |
|---|---|---|---|
| A. Diamond | 1. Thermosetting polymer | I. Rigid structure | i. Non-conductor |
| B. Graphite | 2. Monomer | II. Sheet-like structure | ii. Ester |
| C. Rayon | 3. Soft | III. Cellulose | iii. Conductor of heat |
| D. Nylon | 4. Viscose process | IV. Soft on heating | iv. Ether |
| E. Carbon fibre | 5. Synthetic fibre | V. Unreactive | v. Silk-like thread |
| F. Polyvinyl chloride | 6. High strength | VI. Corrosion resistant | vi. Spacecraft |
| G. Terylene | 7. Thermoplastic | VII. Melts instead of burning | vii. Chlorine atom replaces hydrogen |
| H. Bakelite | 8. Polyester fibre | VIII. Ethylene glycol | viii. Cross-linked |
| 9. Hardest natural substance | IX. Phenol and formaldehyde | ix. Terephthalic acid |
140. Which of the following matches is correct?
Explanation
The question requires matching a material from List-I with its corresponding properties and characteristics from Lists II, III, and IV. The correct match is Option A (A 9 I i) based on the following facts:
- List-I (A): Diamond
- List-II (9): It is the hardest natural substance known.
- List-III (I): It has a rigid 3D tetrahedral structure where each carbon atom is covalently bonded to four others.
- List-IV (i): It is a non-conductor of electricity because all valence electrons are locked in covalent bonds and are not free to move.
Other options are incorrect because Graphite (B) does not soften on heating (IV) nor is it a silk-like thread (v), and Diamond is a pure form of carbon, not an ester (ii).
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