Discussion
In the context of lab-grown diamonds (LGDs), what is used as a diamond seed?
Answer: C
The key gives graphite.
Lab-grown diamonds are made by two methods. In the high-pressure high-temperature (HPHT) method, graphite is the carbon source that is converted into diamond at very high pressure and temperature with a metal catalyst; in chemical vapour deposition (CVD), carbon from a gas such as methane is deposited layer by layer. Strictly, the 'seed' on which the crystal grows is a small diamond in both methods, and none of the options is a diamond; the Commission's answer takes graphite, the carbon from which the diamond is formed, as the answer.
The other options are diamond simulants, not diamond material: white sapphire is aluminium oxide, moissanite is silicon carbide, and cubic zirconia is zirconium dioxide. None can become diamond, which is pure carbon.
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development