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NEET UG CHEMISTRY MCQ: 14 TH GROUP ELEMENTS (P-BLOCK)
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(A): The hardness of silica is less than that of diamond.
(R): In silica, each silicon atom in surrounded by two oxygen atoms where as in diamond each carbon atom is surrounded by 4 carbon atoms.
(R): In silica, each silicon atom in surrounded by two oxygen atoms where as in diamond each carbon atom is surrounded by 4 carbon atoms.
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Correct option: C
(A) is true but (R) is false
Option C is correct because the assertion is true (silica is less hard than diamond), but the reason is false. In silica, each silicon atom is surrounded by four oxygen atoms, and each oxygen atom is surrounded by two silicon atoms, forming a three-dimensional network. In diamond, each carbon atom is surrounded by four carbon atoms.
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