Question

Which of the following is/are allotropes of silicon?

• A. Amorphous silicon
• B. Crystalline silicon
• C. Both $A$ and $B$
• D. Silicon has no allotropes

Answer 1

Answer: (C)

Both $A$ and $B$

Two allotropes of silicon exist at room temperature: amorphous and crystalline. Amorphous appears as a brown powder while crystalline silicon has a metallic lustre and a greyish colour. Single crystals of crystalline silicon can be grown with a process known as the Czochralski process.