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Standard XII

Chemistry

Ionic Bond

During the fo...

Question

During the formation of $M g C l_{2}$ by Born-Haber cycle, which of the following occurs ?

Ionisation of

M g

M g^{+ 2}

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Bond dissociation of

C l_{2}

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Sublimation of

M g

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Electron gained by

C l

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All of these

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Solution

The correct option is C All of these
Sublimation: $M g (s) \to M g (g)$
Ionisation of : $M g (g) \to M g^{2 +} (g)$
Bond dissociation: $\frac{1}{2} C l_{2} \to C l (g)$
Electron gained: $C l (g) \to C l^{2 -} (g)$

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Similar questions

Q. Which is the correct order of formation of

M g C l_{2}

by Born-Haber cycle ?
1. Sublimation of

M g

; 2. Bond dissociation of

C l_{2}

3. Ionisation of

M g

; 4. Electron gained by

C l

Q. The correct folrmula of Q by using Born-Haber cycle for the preparation of

M g B r_{2} (s)

will be:
S

=

heat of sublimation of Mg(s)
I

=

ionisation energy of Mg(g)
D

=

dissociation energy of Br

_{2}

(g)
-E

=

electron affinity of Br(g)
-U

=

lattice energy of MgBr

_{2}

(s)
Q

=

heat of formation of MgBr

_{2}

(s)

Q. (a) Which metal exists in the liquid state at room temperature?
(b) Give the electronic configuration of

M g

and

C l

atoms.
(c) Show the formation of

M g C l_{2}

by the transfer of electrons in between

M g

and

C l

Q. Calculate the enthalpy of formation of

M g F_{2}

from the following data-
Enthalpy of sublimation for

M g (s) \to M g (g) = 146.4 k J m o l^{- 1}

Enthalpy of dissociation of

F_{2} (g) \to 2 F (g) = 155.8 k J m o l^{- 1}

Ionisation energy of

M g (g) \to M g^{2 +} (g) = 2186 k J m o l^{- 1}

Electron gain enthalpy of

2 F \to 2 F^{- 1} = 2 \times - 322.6 = - 645.2 k J m o l^{- 1}

Lattice enthalpy of

M g F_{2} = - 2922.5 k J m o l^{- 1}

Q. Balance the chemical equation :

M g + C l_{2} \to M g C l_{2}

T i C l_{4} + M g

\to

T i + M g C l_{2}

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During the formation of MgCl2 by Born-Haber cycle, which of the following occurs ?

The correct option is C All of theseSublimation: Mg(s)→Mg(g)Ionisation of : Mg(g)→Mg2+(g)Bond dissociation: 12Cl2→Cl(g)Electron gained: Cl(g)→Cl2−(g)

During the formation of $M g C l_{2}$ by Born-Haber cycle, which of the following occurs ?

The correct option is C All of these
Sublimation: $M g (s) \to M g (g)$
Ionisation of : $M g (g) \to M g^{2 +} (g)$
Bond dissociation: $\frac{1}{2} C l_{2} \to C l (g)$
Electron gained: $C l (g) \to C l^{2 -} (g)$