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Which of the following metals from amphoteric oxides?

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Which of the following metals from amphoteric oxides?
A. `Be, A1, Ga, Sn`,and `Pb`
B. `A1,Ga,Sn`, and `Pb`
C. `Sn` and `Pb`
D. `A1`and `Ga`
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Correct Answer - A
Oxides of these metals react with acids as well as bases. For example, stannous oxide, `SnO`, is an amphoteric oxide as it dissolves in both acids and alkalies:
`SnO+2HC1 rarr SnC1_(2) +H_(2)O`
`SnO+2NaOH rarr Na_(2)SnO_(2) +H_(2)O`
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