Question

A farmer has found that the pH of the soil in his fields is 4.2. Name any two chemicals which he can mix with the soil to adjust its pH and make it neutral.

Answer 1

If the pH of the soil is 4.2, then it is highly acidic. Hence, the soil should be treated with basic chemicals such as quick lime (calcium oxide) or slaked lime (calcium hydroxide) to neutralise the effect of acid.