Amphoteric oxide combinations are in \( \mathrm{P} \) (1) \( \mathr...

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Amphoteric oxide combinations are in
\( \mathrm{P} \)
(1) \( \mathrm{ZnO}, \mathrm{K}_{2} \mathrm{O}, \mathrm{SO}_{3} \)
W
(2) \( \mathrm{ZnO}, \mathrm{P}_{2} \mathrm{O}_{5}, \mathrm{Cl}_{2} \mathrm{O}_{7} \)
(3) \( \mathrm{SnO}_{2}, \mathrm{Al}_{2} \mathrm{O}_{3}, \mathrm{ZnO} \)
(4) \( \mathrm{PbO}_{2}, \mathrm{SnO}_{2}, \mathrm{SO}_{3} \)
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