Question

Slow acting nitrogenous fertiliser among the following is:
A. $N{H_2}CON{H_2}$
B. $N{H_4}N{O_3}$
C. $CaNCN$
D. $KN{O_3}$

Answer 1

Hint: Slow acting means the fertiliser decomposes very slowly by adding some reactants. In the field of agriculture, the nitrogenous fertiliser hydrolysis product is employed as a source of nitrogen for plants, seeds, etc. That can be found in nature in a variety of shapes for a variety of purposes.

Complete Step by Step Solution:
Fertilisers are those chemicals that farmers employ in the agricultural field to promote the quick development of crops, plants, etc. and to supply the plants with vital nutrients that they are unable to obtain from their surroundings.

$CaNCN$ is the chemical symbol for calcium cyanamide. Because it produces ammonia and calcium carbonate when hydrolysed with water, it is utilised as fertiliser in the agricultural industry.

The following formula describes the hydrolysis process of calcium cyanamide:
$CaNCN + 2{H_2}O + C{O_2} \to CaC{O_3} + N{H_2}CON{H_2}$
$N{H_2}CON{H_2} + {H_2}O \to C{O_2} + 2N{H_3}$
$N{H_3}\xrightarrow[{bacteria}]{{Nitrifying}}Nitrates \to Plants$

As a result of hydrolysis in the above reaction, ammonia was produced, which is employed mostly in the anhydrous form in farming as a source of nitrogen fertiliser for plants, crops, seeds, etc. Because anhydrous ammonia is utilised to maintain a quantitative balance with crops that are both moist and dry, including dry crops.

Additional information: Both plant development and the mechanism of photosynthesis are aided by ammonia.
The nitrogenous fertiliser with a slow acting is calcium cyanamide because of how slowly it breaks down.
So, option C is correct.

Note: One may have chosen option A i.e., urea which is a nitrogenous fertiliser but it decomposes fast. But that will be wrong, so first you should write the whole equation and then go for the answer.