Q45 / 180 · AIIMS 2003 · Chemistry

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

  • A
    If both assertion and reason are true and the reason is the correct explanation of the assertion
  • B
    If both assertion and reason are true and the reason is not the correct explanation of the assertion
  • C
    If assertion is true but reason is false
  • Correct answer
    D
    If both assertion and reason are false.

Solution

${ }_{11} \mathrm{Na}^{22} \rightarrow{ }_{12} \mathrm{Mg}^{22}+{ }_{-1} \beta^0$ It involves $\beta$-particle emission. While positron emission is due to the conversion of proton into neutron. $$ { }_1^1 p \rightarrow{ }_0^1 n+{ }_1^0 \beta $$

Hence, the correct answer is option: 'D'.

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