(i) Graphite (C)
(ii) Quartz glass (SiO2)
(iii) Chrome alum
(iv) Silicon carbide (SiC)
Correct Answer: (ii) Quartz glass (SiO2)
Explanation: Solids are considered as an amorphous when they have an order of particles present in it in a short range. Hence, Quartz glass is an amorphous solid.