P, X, A, Y, Q and D (Both Graphite and Diamond included) are the elements belonging to 14th group of Modern periodic table. The correct trend of density for these elements is P < X < A < Y < Q < D. The element ‘Y’ (or the allotrope of the element) in the sequence is

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Diamond

Graphite

answer is D.

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Detailed Solution

Atomic radius trend…CSi>Ge>Pb>Sn;EN trend…C>Pb>Si=Ge=Sn;Density…..C(graphite)Si>Ge>Sn>Pb;Resistivity…C>Si=Ge>Pb>Sn;Conductivity…C

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