Assertion :Carbon dioxide is a gas but silicon dioxide is an in-fusible solid. Reason: Carbon dioxide has a linear $π -$ bonded structure.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
Silica (silicon dioxide) has a three-dimensional network structure. In silica, silicon is $s p^{3}$ -hybridized and is thus linked to four oxygen atoms and each oxygen atom is linked to two silicon atoms forming a three-dimensional giant molecule as shown in figure.
But $C O_{2}$ has linear structure due to sp hybridization and exists as gas at room temperature.

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Assertion :Carbon dioxide is a gas but silicon dioxide is an in-fusible solid. Reason: Carbon dioxide has a linear π− bonded structure.

Assertion :Carbon dioxide is a gas but silicon dioxide is an in-fusible solid. Reason: Carbon dioxide has a linear $π -$ bonded structure.