Quartz on strong heating followed by rapid cooling gives glass which is an amorphous solid, because

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Which of the following is an amorphous solid ?

(a) Graphiter (C) (b) Quartz glass $(S i O_{2})$

which of the following statement is not true about amorphous solids ?

(a) On heating they may become crystalline at certain temperature

(b) They may become crystalline on keeping for long time

(d) They are anisotropic in nature

Which of the following features are not shown by quartz glass ?

(a) This is a crystalline solid

(b) Refractive index is same in all the directions

(d) This is also called super cooled liquid

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