Which of the following is an amorphous solid ?
(a) Graphiter (C) (b) Quartz glass (SiO2)
(c) Chrome alum (d) Silicon carbide (SiC)
Which of the following element is used in the extraction of Silicon when mixed with finely powdered silica:
Which of the following elements is a metalloid ?
(a) sodium
(b) sulphur
(c) silicon
(d) silver