Question

How many of the following oxides are anhydrides of dibasic oxy-acid?
(i) $S{O}_2$

(ii) $P_4{O}_{10}$

(iii) $N{O}_2$
(iv) $C{O}_2$

(v) $L{i}_{2}O$

(vi) $CO$
(vii) $Cl{O}_2$

(viii) $C{l}_{2}O$

(ix) $I_2{O}_5$

Answer 1

(i) $S{O}_2\to H_{2}S{O}_3\left(dibasic\right)$
(ii)$P_4{O}_{10}\to H_{2}P{O}_4\left(tribasic\right)$
(iii)$N{O}_2\to HN{O}_{2}HN{O}_3\left(monobasic\right)$
(iv)$C{O}_2\to H_{2}C{O}_3\left(dibasic\right)$
(v)$L{i}_{2}O\to LiOH\left(notanacid\right)$
(vi)CO$\to$ neutral
(vii)$Cl{O}_2\to HCl{O}_2+HCl{O}_3\left(monobasic\right)$
(viii)$C{l}_{2}O\to HOCl\left(monobasic\right)$
(ix)$I_2{O}_5\to HI{O}_3\left(monobasic\right)$
Hence, answer is 2.