Answer
Please see the work below.
Work Step by Step
The chemical nature of oxides of elements varies across the period as
Basic oxide → Amphoteric oxide → Acidic oxide Thus, the correct increasing order of acidity is
$Li_{2}O$(Basic oxide), $BeO$(Amphoteric oxide), $B_{2}O_{3}$(Acidic oxide), $CO_{2}$(Acidic oxide), $N_{2}O_{5}$(Acidic oxide)
