Consider the following statements. 1. Among the fertilisers used, urea contains maximum percentage of Nitrogen. 2. The mixture of calcium sulphate is known as super phosphate of lime. 3. Potassium magnesium sulphate is called the muriate of potash. Which of the statements given above are correct? A. 1 and 2 B. 2 and 3 C. 1 and 3 D. 1, 2 and 3

The correct answer is C. 1 and 3.

Urea is a nitrogenous fertilizer that contains 46% nitrogen. It is the most commonly used nitrogen fertilizer in the world. Superphosphate of lime is a mixture of calcium sulfate and dicalcium phosphate. It contains 16-20% phosphorus pentoxide and 18-22% calcium oxide. Potassium magnesium sulfate is a fertilizer that contains 20-22% potassium oxide, 12-14% magnesium oxide, and 18-20% sulfur trioxide.

Statement 1 is correct because urea contains the highest percentage of nitrogen of any fertilizer. Statement 2 is incorrect because superphosphate of lime is a mixture of calcium sulfate and dicalcium phosphate, not calcium sulfate. Statement 3 is correct because potassium magnesium sulfate is called the muriate of potash.