Question

Assertion :23 g of sodium has $6.022\times {10}^{23}$ atoms sodium. Reason: Number of atoms in the given mass of sodium cannot be determined.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is C Assertion is correct but Reason is incorrect

$23g$ of $Na=1$ mole of $Na$

From Avagadro's law, $1$ mole of any element contains $6.022\times {10}^{23}$ atoms.

$\therefore$ $23g$ of $Na$ contains $6.022\times {10}^{23}$ atoms of $Na$.

The assertion is correct but the reason is incorrect.