Assertion :Avogadro's number is a dimensionless quantity.
Reason: It is a number of atoms or molecules in one gram mole.

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
Avogadro constant, a dimensionless number, is called the Avogadro number, sometimes denoted $N_{A}$ , it is the number of particles that are contained in one mole of a substance.
So assertion and reason is correct and it is correct explanation
Option A is correct

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Assertion :Avogadro's number is a dimensionless quantity. Reason: It is a number of atoms or molecules in one gram mole.

Assertion :Avogadro's number is a dimensionless quantity.
Reason: It is a number of atoms or molecules in one gram mole.