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Reactivity with Air and Water (Group 2)

How many of t...

Question

How many of the following oxides are basic
1. $B_{2} O_{3}$
2. $T l_{2} O$
3. $I n_{2} O_{3}$
4. $A l_{2} O_{3}$

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Solution

For group 13 elements, the acidic nature of oxides decreases and the basic nature of oxides increases on moving from $B$ to $T l$ . This is because as we move down the group, the atomic size of elements goes on increasing, whereas the ionisation energy decreses, due to which the strength of metal oxide ( $M O$ ) bond goes on decreasing. Thus, boron trioxide or boron oxide is acidic and reacts with basic oxides to give metal borates. Aluminium and gallium oxides are amphoteric while oxides of indium and thallium are basic in nature.

$(A) B_{2} O_{3}$ (acidic)
$(B) T l_{2} O$ (basic)
$(C) I n_{2} O_{3}$ (basic)
$(D) A l_{2} O_{3}$ (ampho)

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