JEE Main 26 Feb 2021 Shift 2 Solved Paper

(a) B2O3⟶ oxide of boron (non-metal) :acidic
CaO⟶ oxide of calcium (metal) : basic
(b) B2O3⟶ oxide of boron (non-metal) : acidic
SiO2⟶ oxide of silicon (non-metal) : acidic
(c) N2O⟶ oxide of nitrogen (non-metal) : neutral
BaO⟶ oxide of barium (metal) : basic
(d) CaO⟶ oxide of calcium (metal): basic
SiO2⟶ oxide of silicon (non-metal): acidic
So, option (b) is the correct answer. B2O3 and SiO2 are being acidic oxide they react with base to give salt and water.
B2O3+2NaOH⟶

2NaBO2

Sodium‌metaborate

+H2O
SiO2+2NaOH⟶

Na2SiO3

Sodium‌silicate

+H2O