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Which of the following oxides is most ac...

Which of the following oxides is most acidic and most basic respectively?
I(CaO), II`(K_2O)`, III`(H_2O)`, IV`(SO_3)`, V`(N_2O_5)`, VI`(SO_2)`.

A

IV, II

B

V, I

C

VI, II

D

V, II

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The correct Answer is:
A
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