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  1. Natural silica

    2. A.
    mainly contains quartz.
    B.
    is not stable at high temperature.
    C.
    transforms to other allotropic forms i.e tridymite and cristoballite involving very high volume changes.
    D.
    all (a), (b) and (c).

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    Answer : Option D

    Explanation :

    No answer description available for this question.

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