Question

Study the following reactions and mark the correct properties shown by water :
(i) $S{O}_3+H_{2}O\to H_{2}S{O}_4$
(ii) $C{l}_2{O}_7+H_{2}O\to 2HCL{O}_4$
(iii)$N{a}_{2}O+H_{2}O\to 2NaOH$
(iv)$Cao+H_{2}O\to Ca(OH{)}_2$

• A. All oxides react with water to give hydroxides
• B. Acidic oxides are formed by metals and basic oxides by non-metals
• C. Non-metal oxides combine with water to form acids while metallic oxides combine with water to form alkalies
• D. Acidic oxides are stronger than basic oxides since they form strong acids

Answer 1

Answer: (C)

(i) $S{O}_3+H_{2}O\to H_{2}S{O}_4$

(ii)$C{l}_2{O}_7+H_{2}O\to 2HCl{O}_4$

$S{O}_3$ and $C{l}_2{O}_7$ are non metallic oxides

from acid on reacting with water

(iii)$N{a}_{2}O+H_{2}O\to 2NaOH$

(iv) $C_{2}O+H_{2}O\to Ca(OH{)}_2$

$N{a}_{2}O$ and $CaO$ are metallic oxide form

base on reacting with water

Ans (C) Non metal oxides combines with water to

from acids while metallic oxides combine

with water to form alkalies.