The P Block Elements - Result Question 71
####74. Which one of the following arrangements does not give the correct picture of the trends indicated against it?
[2000, 2008]
(a) $F_2>Cl_2>Br_2>I_2$ : Oxidizing power
(b) $F_2>Cl_2>Br_2>I_2$ : Electron gain enthalpy
(c) $F_2>Cl_2>Br_2>I_2$ : Bond dissociation energy
(d) $F_2>Cl_2>Br_2>I_2$ : Electronegativity.
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Solution:
- (b and c)
(a) The oxidising power of halogen follow the order $F_2>Cl_2>Br_2>I_2$.
(b) The correct order of electron gain enthalpy of halogens is $Cl_2>F_2>Br_2>I_2$. The low value of $F_2$ than $Cl_2$ is due to its small size.
(c) The correct order of bond dissociation energies of halogens is
$Cl_2>Br_2>F_2>I_2$.
(d) It is the correct order of electronegativity values of halogens.
$F_2>Cl_2>Br_2>I_2$
