Discussion
Assertion (A): Alumina for technical ceramics is produced chemically rather than simply crushed from a mineral.
Reason (R): The purity and particle size that technical work demands are not found in any natural deposit.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the necessity. Technical alumina is made by the Bayer process, dissolving bauxite in caustic soda, precipitating aluminium hydroxide and calcining it, then milling to a controlled particle size. No natural deposit offers 99.5 per cent purity with a submicron size distribution, and both are needed - impurities form glassy grain boundary phases that destroy high-temperature strength, and coarse particles will not sinter to full density.
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