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Ruchi Nigam
Asked: 2022-11-08T05:59:03+05:30 In:

Which of the following are amphoteric oxides?
A. `CO_(2)` and `SiO_(2)`
B. `SiO_(2)` and `GeO_(2)`
C. `GeO_(2)` and `SnO_(2)`
D. `SnO_(2)` and `PbO_(2)`

Which of the following are amphoteric oxides?
A. `CO_(2)` and `SiO_(2)`
B. `SiO_(2)` and `GeO_(2)`
C. `GeO_(2)` and `SnO_(2)`
D. `SnO_(2)` and `PbO_(2)`
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1 Answer

  1. Correct Answer – D
    `SnO_(2)` and `PbO_(2)` dissolve in concentrated alkalis giving stannates and plumbates:
    `SnO_(2) + 2NaOH rarr Na_(2)SnO_(3) + H_(2)O`
    `PbO_(2) + 2NaOH rarr Na_(2)PbO_(3) + H_(2)O`
    Both are insoluble in acids except when a complexing agent such as `F^(-)` or `Cl^(-)` is present.

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