Assertion (A):The formula of sand is SiO2.Reason (R): Combining capacity of silicon is '6'.

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Assertion (A):The formula of sand is ${SiO}_{2}$ .

Reason (R): Combining capacity of silicon is '6'.

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Assertion is True, Reason is True and Reason is correct explanation of Assertion

Assertion is True, Reason is True but Reason is not correct explanation of Assertion

Assertion is True, Reason is False

Assertion is False, Reason is True

answer is C.

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Detailed Solution

Combining capacity of silicon in ${SiO}_{2}$ is ‘4’. This is because silicon belongs to IVA group in the periodic table. So, the valency of silicon is 4.

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