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Among the following oxides, which has th...

Among the following oxides, which has the maximum lattice energy?

A

`Ba gt AI gt Ga gt In gt TI`

B

`B lt AI lt Ga lt In lt TI`

C

`B lt AI gt Ga lt In gt TI`

D

`B lt AI gt Ga gt In gt TI`

Text Solution

Verified by Experts

The correct Answer is:
D
As we move from B to AI, the sum of `Delta_(i) H_(1) + Delta_(i) H_(2) + Delta_(i) H_(3)` decreases substantially (6887 kJ `mol^(-1)` to 5137 kJ `mol^(-1)`)due to increase in the atomic size and hence AI has a high tendency to lose electrons. Since the electrode potentials increases from AI to TI therefore, their electropositive character decreases,
i.e., AI (-1.66 V) to Ga (-0.56 V) to In (-0.34 V) to TI (+ 1.26 V) accordingly.
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