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a
Al3+
b
Cr3+
c
Fe3+
d
Zn2+
answer is C.
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Detailed Solution
Al3+, Cr3+ and Zn2+ are amphoteric i.e. Al2O3, Cr2O3. and ZnO dissolve both in acids and alkalies.Fe3+ is distinctly basic. Fe2O3 dissolves only in acids.