Classification of Elements Part 1

(a) $\mathrm{B}_2\mathrm{O}_3 \rightarrow$ oxide of boron (non-metal) :acidic $\mathrm{CaO} \rightarrow$ oxide of calcium (metal) : basic (b) $\mathrm{B}_2\mathrm{O}_3 \rightarrow$ oxide of boron (non-metal) : acidic $\mathrm{SiO}_2 \rightarrow$ oxide of silicon (non-metal) : acidic (c) $\mathrm{N}_2\mathrm{O} \rightarrow$ oxide of nitrogen (non-metal) : neutral $\mathrm{BaO} \rightarrow$ oxide of barium (metal) : basic (d) $\mathrm{CaO} \rightarrow$ oxide of calcium (metal): basic $\mathrm{SiO}_2 \rightarrow$ oxide of silicon (non-metal): acidic So, option (b) is the correct answer. $\mathrm{B}_2\mathrm{O}_3$ and $\mathrm{SiO}_2$ are being acidic oxide they react with base to give salt and water. $\mathrm{B}_2\mathrm{O}_3 + 2\mathrm{NaOH} \xrightarrow[\text{Sodiummetaborate}]{} 2\mathrm{NaBO}_2 + \mathrm{H}_2\mathrm{O}$ $\mathrm{SiO}_2 + 2\mathrm{NaOH} \xrightarrow[\text{Sodiumsilicate}]{} \mathrm{Na}_2\mathrm{SiO}_3 + \mathrm{H}_2\mathrm{O}$