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Bond Order and Enthalpy

Which of the ...

Question

Which of the following orders is not correct with respect to the property indicated against each?

A

F > C l > B r > I \to

electron gain enthalpy

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B

F^{-} > {C l}^{-} > B r > I^{-} \to

enthalpy of hydration

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C

F_{2} > {C l}_{2} > {B r}_{2} > I_{2} \to

bond dissociation energy

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D

F_{2} < {C I}_{2} < {B r}_{2} < I_{2} \to X - X

bond lenght

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Solution

The correct option is D $F > C l > B r > I \to$ electron gain enthalpy
Electron Gain Enthalpy is the energy released when one mole of electron are added to gaseous atoms of an element.
The correct order of Electron gain enthalpy of Fluorine family is,
$C l > B r > F > I$
The reason for this is that the size of fluorine atom is very small. So when an electron is added in the fluorine atom it will suffer more electro negativity as all the electrons will be very close to each other and hence the electron gain enthalpy of chlorine is more negative than that of fluorine.

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Similar questions

Q. Which of the following options does not give to the correct trends indicated against it?
(I)

F_{2} > C l_{2} > B r_{2} > I_{2}

: Bond dissociation energy
(II)

F_{2} > C l_{2} > B r_{2} > I_{2}

: Oxidizing nature
(III)

C l > F > B r > I

: Electron gain enthalpy
(IV)

F > C l > B r > I

: Electronegativity

Q. Which of the following options does not give to the correct trends indicated against it?
(I)

F_{2} > C l_{2} > B r_{2} > I_{2}

: Bond dissociation energy
(II)

F_{2} > C l_{2} > B r_{2} > I_{2}

: Oxidizing nature
(III)

C l > F > B r > I

: Electron gain enthalpy
(IV)

F > C l > B r > I

: Electronegativity

Q. The increasing order of bond dissociation enthalpy of the following substances is:

F_{2} < C l_{2} < B r_{2} < I_{2}

If the order of bond dissociation enthalpy is true enter 1 else 0.

Q. Arrange in increassing order of bond dissocation enthalpy of

F_{2}, C l_{2}, B r_{2}, I_{2}

Among halogens, the correct order of amount of energy released in electron gain (electron gain enthalpy ) is
(a) F > Cl > Br > I (b) F < Cl < Br < I (c) F < Cl > Br > I (d) F < Cl < Br < I

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