Q. Which of the following does not contains silicon?
A) Kaoline
B) Agate
C) Ruby
D) Quartz
Explanation
(c)
Ruby in mineral of aluminium, $ie,Al_{2}O_{3}.$ It does not contain silicon
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.