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Question

Which is the correct order of formation of MgCl2 by Born-Haber cycle ?
1. Sublimation of Mg ; 2. Bond dissociation of Cl2
3. Ionisation of Mg ; 4. Electron gained by Cl

A
1,3,2,4
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B
1.3,4,2
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C
1,2,3,4
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D
None of these.
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Solution

The correct option is A 1,3,2,4
Sublimation: Mg(s)Mg(g)
Ionisation of : Mg(g)Mg2+(g)
Bond dissociation: 12Cl2Cl(g)
Electron gained: Cl(g)Cl2(g)
Mg+Cl2MgCl2
Hence, 1, 3,2,4 is the correct order.

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