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Periodic Table and Periodicity question

2008 · Q109
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Periodic Table and Periodicity question

2008 · Q109

NEETChemistryPeriodic Table and PeriodicityMultiple correct+4 / −1
Which one of the following arrangements does not give the correct picture of the trends indicated against it ?
  1. A
    F2 > Cl2 > Br2 > I2 : Bond dissociation energy
  2. B
    F2 > Cl2 > Br2 > I2 : Electronegativity
  3. C
    F2 > Cl2 > Br2 > I2 : Oxidizing power
  4. D
    F2 > Cl2 > Br2 > I2 : Electron gain enthalpy
View written solutionFree

Correct answer: A, D

For Diatomic molecules (X2) of halogens the bond dissociation energy decreases in the order:

Cl2 > Br2 > F2 > I2

The oxidising power, electronegativity and relativity decrease in the order:

F2 > Cl2 > Br2 > I2

Order of Electron gain enthalpy of halogens

Cl2 > F2 > Br2 > I2

The low value of electron gain enthalpy of fluorine is probably due to small size of fluorine atom.

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