Which pair of oxides is acidic in nature?

Question:
Which pair of oxides is acidic in nature?

$\mathrm{N}_{2} \mathrm{O}, \mathrm{BaO}$
$\mathrm{CaO}, \mathrm{SiO}_{2}$
$\mathrm{B}_{2} \mathrm{O}_{3}, \mathrm{CaO}$
$\mathrm{B}_{2} \mathrm{O}_{3}, \mathrm{SiO}_{2}$

Correct Option: , 4

Solution:

$\mathrm{B}_{2} \mathrm{O}_{3}$ and $\mathrm{SiO}_{2}$ both are oxides of non-metal and hence are acidic in nature.

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