Which of the following is a general method of preparing acids?

A. Direct combination of constituent elements
B. Double decomposition involving a salt solution
C. Reaction between an anhydride and water
D. Reaction between a base and an amphoteric oxide
E. Dissolution of hydroxides followed by neutralization

Correct Answer:

Option C – Reaction between an anhydride and water

Explanation

There are several methods of preparation of acids. These include the following:

1. By the reaction between an acidic oxide of a non-metal (acid anhydride) and water.

SO2(g) + H2O(l) → H2SO3(aq) Trioxosulphate(IV)

P4010(s) + 2H2O(l) → 4HPO3(aq) Trioxophosphate(V)