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Question

Arrange the following oxides in the decreasing orders of their basic strength.
I. Tl2O II. Al2O3 III. Tl2O3 IV. Ga2O3

A
I>III>IV>II
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B
II>IV>III>I
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C
III>I>II>IV
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D
IV>II>I>III
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Solution

The correct option is A I>III>IV>II
Since charges on the cation II, III, IV are same, we have to check the size of the cation. Order of thesize of those cation are Tl3+>Ga3+>Al3+.
So correct order of basic oxides is,
Tl2O>Tl2O3>Ga2O3>Al2O3

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