Question

Dolomite is a source of
(A). Calcium
(B). Magnesium
(C). Iron
(D). Sulphur
Choose the correct answer from the options given below:

• A. (A), (B) and (D) only.
• B. (A) and (B) only.
• C. (A), (B), (C) and (D).
• D. (B), (C) and (D) only.

Hint:

To treat magnesium deficiency in acid soils, use dolomite instead of calcite ($\text{CaCO}_3$) because dolomite supplies both calcium and magnesium while neutralizing acidity.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Dolomite is a naturally occurring carbonate mineral used in agriculture both as an essential nutrient source and as a liming agent to neutralize acid soils.

Step 2: Detailed Explanation:
- The chemical formula of pure dolomite is $\text{CaMg(CO}_3)_2$.
- It consists of an alternating structural arrangement of calcium and magnesium carbonate sheets.
- When applied to soils, dolomite dissolves slowly, releasing divalent Calcium ($\text{Ca}^{2+}$) and Magnesium ($\text{Mg}^{2+}$) ions into the soil solution.
- It does not contain significant amounts of iron or sulfur in its mineral lattice.
Therefore, dolomite is a direct agricultural source of Calcium and Magnesium only.

Step 3: Final Answer:
The correct option is (B).