Question

$M( g ) \rightarrow M^{+}( g )+e^{-}, \Delta H=100\, eV$
$M( g ) \rightarrow M^{2+}( g )+2 e^{-}, \Delta H=250 \,eV$
Which is the incorrect statement?

• A. $I_1$ of $M(g)$ is $100\,eV$
• B. $I_1$ of $M^+(g)$ is $150\,eV$
• C. $I_2$ of $M(g)$ is $250\,eV$
• D. $I_2$ of $M(g)$ is $150\,eV$

Answer 1

Answer: (C)

$M( g ) \rightarrow M^{+}( g )+e^{-}, I_1(M)=\Delta H_1=100 \,eV$
(a) is correct
$M^{+}( g ) \rightarrow M^{2+}( g )+e^{-}, I_2(M)=250-100=150 \,eV$
or $I_2\left(M^{+}\right)=150\,eV$ (b) is correct
$I_2$ of $M( g )$ is $150\, eV$ thus (c) is incorrect