Question

Which of the following is used to neutralise the basic nature of soil?

• A. Quicklime
• B. Organic matter
• C. Slaked lime
• D. Baking soda

Answer 1

The correct option is B Organic matter

In order to reduce the alkaline effect of the soil, decaying organic matter is added. Organic matter releases acids when they decay, which can counter balance the alkaline nature of the soil.
Quick lime $\left(CaO\right)$ and slaked lime $\left[Ca\right(OH{)}_2]$ both are basic in nature. Also, baking soda $\left(NaHC{O}_3\right)$ is a salt of strong base $\left(NaOH\right)$ and weak acid $\left(H_{2}C{O}_3\right)$, so adding baking soda in the soil will increase the basic nature of the soil.