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In which of the following pairs, the fir...

In which of the following pairs, the first oxide is amphoteric and second oxide is basic?

A

`V_2O_3, V_2O_5`

B

`SO_2, Mn_2O_7`

C

`Cr_2O_3, Cro`

D

`CrO_3, Cr_2O_3,`

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