Question

Statement 1: Both $12\, g$. of carbon and $27 \,g$. of aluminium will have $6.02 \times 10^{23}$ atoms.
Statement 2 : Gram atomic mass of an element contains Avogadro’s number of atoms.

• A. If both Statement $1$ and Statement $2$ are true and the statement $2$ is the correct explanation of the statement $1$
• B. If both Statement $1$ and Statement $2$ are true but statement $2$ is not the correct explanation of the statement $1$
• C. If Statement $1$ is true but Statement $2$ is false
• D. If Statement $1$ is false but Statement $2$ is true

Answer 1

Answer: (A)

The molar masses of $C$ and $Al$ are $12\, g / mol$ and $27\, g / mol$ respectively.
Both $12\, g$ of carbon and $27 g$ of aluminium correspond to 1 mole. They will have $6.02 \times 10^{23}$ atoms.
This is because gram atomic mass of an element contains Avogadro's number of atoms. Thus, both Assertion and Reason are correct and Reason is the correct explanation for Assertion.