Which of the following elements can present both in cation and anion of its salts?

B

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A l

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G a

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T l

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Solution

The correct option is B $A l$
Boron can only form cation of its salts.
$A l$ can form both cation and anion of its salts.
Example: $A l^{3 +}$ (cation) $A l O_{3}^{3 -}$ (Anion)
$G a$ and $T l$ can only form cation of their salts.

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