Assertion :Specific gravity is dimensionless quantity. Reason: Specific gravity is relative density of a substance, measured with respect to density of water at $4^{o} C$ .

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The specific gravity of a substance is defined as the density of the substance divided by the density of water at $4 ℃$ . Therefore, the units of density cancel each other & the term specific gravity becomes dimensionless quantity.
Specific gravity $=$ Density of substance $/$ Density of water at $4 ℃$
Therefore, both Assertion and Reason are correct and the Reason is the correct explanation of the Assertion.

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