Q. Formula for agate is
A) $Na_{2}SiO_{3}$
B) $K_{2}O.SiO_{2}.Al_{2}O_{2}$
C) $SiO_{2}$
D) $CaF_{2}$
Explanation
(c)
Quartz is found in many varieties which have different colour due to impurities, $eg,\$amelthyst (purple), opel (white) carnelian and agate
$\therefore$Agate is $SiO_{2}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.