The correct way of making a solution of acid in water is to
(a) add water to acid.
(b) add acid to water.
(c) mix acid and water simultaneously.
(d) add water to acid in a shallow container.
The correct way of making a solution of acid in water is to add acid to water. because If we add water to acid it will be an exothermic reaction which will produce a lot of heat which may lead to explosion.
Hence option (B) is correct.