Which of the following statement (s) are correct? A. Amorphous solids have a sharp melting point...

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Which of the following statement (s) are correct?
A. Amorphous solids have a sharp melting point.
B. Quartz is a crystalline solid.
C. Crystalline solids soften, melt and start flowing over a range of temperature.
D. Quartz glass is an amorphous solid.
(1) A, B and C
(2) B and D
(3) A, C and D
(4) B, C and D
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