Question
Consider the following ionisation reactions :
| $$I.E.\left( {kJ\,mo{l^{ - 1}}} \right)$$ |
$$I.E.\left( {kJ\,mo{l^{ - 1}}}\right)$$ |
| $$A\left( g \right) \to {A^ + }\left(g \right) + {e^ - },{A_1}$$ |
$$A\left( g \right) \to {A^ + }\left(g \right) + {e^ - },{A_1}$$ |
| $${B^ + }\left( g \right) \to {B^{2 + }}\left( g \right) + {e^ - },{B_2}$$ |
$$C\left( g \right) \to {C^ + }\left(g \right) + {e^ - },{C_1}$$ |
| $${C^ + }\left( g \right) \to {C^{2 +}}\left( g \right) + {e^ - },{C_1}$$ |
$${C^{2 + }}\left( g \right) \to {C^{3 + }}\left( g \right) + {e^ - },{C_3}$$ |
If monovalent positive ion of $$A,$$ divalent positive $$ion$$ of $$B$$ and trivalent positive ion of $$C$$ have zero electron. Then incorrect order of corresponding $$I.E.$$ is :
A.
$${C_3} > {B_2} > {A_1}$$
B.
$${B_1} > {A_1} > {C_1}$$
C.
$${C_3} > {C_2} > {B_2}$$
D.
$${B_2} > {C_3} > {A_1}$$
Answer :
$${B_2} > {C_3} > {A_1}$$
Solution :
$$\eqalign{
& A \Rightarrow H\left( {1{s^1}} \right) \cr
& B \Rightarrow He\left( {1{s^2}} \right) \cr
& C \Rightarrow Li\left( {1{s^2}2{s^1}} \right) \cr
& {A_1} = I{E_1}\left( A \right)\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{B_2} = I{E_2}\left( B \right) \cr
& {B_1} = I{E_1}\left( B \right)\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{C_2} = I{E_2}\left( C \right) \cr
& {C_1} = I{E_1}\left( C \right)\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{C_3} = I{E_3}\left( C \right) \cr
& {B_1} > {A_1} > {C_1}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{C_3} > {B_2} > {A_1} \cr
& He > H > Li\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,L{i^{2 + }}H{e^ + }H \cr
& 1{s^2}\,\,1{s^1}\,\,2{s^1}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,1{s^1}\,\,1{s^1}\,\,1{s^1} \cr
& {C_3} > {C_2} > {B_2}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,L{i^{2 + }}\,L{i^ + }\,\,H{e^ + } \cr
& 1{s^2}\,\,1{s^2}\,\,1{s^1} \cr} $$