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 :
$$\eqalign{ & A \Rightarrow H\left( {1{s^1}} \right) \cr & B \Rightarrow He\left( {1{s^2}} \right) \cr & C \Rightarrow Li\left( {1{s^2}2{s^1}} \right) \cr & {A_1} = I{E_1}\left( A \right)\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{B_2} = I{E_2}\left( B \right) \cr & {B_1} = I{E_1}\left( B \right)\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{C_2} = I{E_2}\left( C \right) \cr & {C_1} = I{E_1}\left( C \right)\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{C_3} = I{E_3}\left( C \right) \cr & {B_1} > {A_1} > {C_1}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{C_3} > {B_2} > {A_1} \cr & He > H > Li\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,L{i^{2 + }}H{e^ + }H \cr & 1{s^2}\,\,1{s^1}\,\,2{s^1}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,1{s^1}\,\,1{s^1}\,\,1{s^1} \cr & {C_3} > {C_2} > {B_2}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,L{i^{2 + }}\,L{i^ + }\,\,H{e^ + } \cr & 1{s^2}\,\,1{s^2}\,\,1{s^1} \cr} $$

Releted MCQ Question on
Inorganic Chemistry >> Classification of Elements and Periodicity in Properties

Releted Question 1

The correct order of second ionisation potential of carbon, nitrogen, oxygen and fluorine is

A. $$C > N > O > F$$
B. $$O > N > F > C$$
C. $$O > F > N > C$$
D. $$F > O > N > C$$
Releted Question 2

The element with the highest first ionization potential is

A. boron
B. carbon
C. nitrogen
D. oxygen
Releted Question 3

The first ionisation potential in electron volts of nitrogen and oxygen atoms are respectively given by

A. $$14.6,13.6\,$$
B. $$13.6,14.6$$
C. $$13.6,13.6$$
D. $$14.6,14.6$$
Releted Question 4

Atomic radii of fluorine and neon in $$\mathop {\text{A}}\limits^ \circ $$ngstorm units are respectively given by

A. $$0.72,1.60$$
B. $$1.60,1.60\,$$
C. $$0.72,0.72\,\,$$
D. None of these values

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Classification of Elements and Periodicity in Properties


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