Question

Assertion :${}_{11}^{22}\text{Na}$ emits a positron giving ${}_{12}^{22}\text{Mg}$. Reason: In ${\beta }^{+}$ emission neutron is transformed into proton.

• 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 D Both Assertion and Reason are incorrect

${}_{11}^{22}\text{Na}{⟶}_{12}^{22}\text{Mg}{+}_{-1}{\beta }^0$.
Thus, the given change involves emission of ${\beta }^{-}$ particles (and not positron, ${\beta }^{+}$).
In ${\beta }^{+}$ emission proton is transformed into neutron.
${}_1^1\text{H}{⟶}_0^1\text{n}{+}_{+1}^0\beta$