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Q.

Which of the following allotropes of silicon is the most reactive?

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a

Crystalline silicon

b

Amorphous silicon

c

Both A and B are inert

d

Cannot be determined.

answer is B.

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Detailed Solution

Concept- Chemical elements that may exist in two or more forms in the same physical state are said to have allotropy. The way that an element's atoms are linked together varies amongst allotropes.
Silicon occurs in both crystalline and amorphous. Crystalline silicon is less reactive than amorphous. As in crystalline structure the silicon atoms are bonded to each other more strongly. As a result, it is less reactive and more stable.
Hence, the correct answer is 2.

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