Question

Calcium cyanamide is used as fertilizer because on hydrolysis it gives ________.
(A)- Ammonia
(B)- Calcium Carbide
(C)- Nitrogen gas
(D)- Nitrogen oxide

Answer 1

Hint: Formed product from the process of hydrolysis of Calcium cyanamide is used as the source of nitrogen in the field of agriculture for plants, seeds, etc. That will be present in many different forms in nature for providing different functions & uses.

Complete Solution :
Fertilizers are those species which are used in the agriculture field by the farmers for the rapid growth of crops, plants, etc. and for providing essential substance to the plants which they are not able to gain from the surroundings. Calcium cyanamide chemically written as ${\text{CaC}}{{\text{N}}_{\text{2}}}$. It is used in the field of agriculture as a fertilizer because on hydrolysis with water it gives ammonia & calcium carbonate. Hydrolysis reaction of Calcium cyanamide is written as follow:
     \[\mathop {{\text{CaC}}{{\text{N}}_{\text{2}}}}\limits_{{\text{(calcium cyanamide)}}} {\text{ + }}\mathop {{\text{3}}{{\text{H}}_{\text{2}}}{\text{O}}}\limits_{{\text{(water)}}} \to \mathop {{\text{2N}}{{\text{H}}_{\text{3}}}}\limits_{{\text{(ammonia)}}} {\text{ + }}\mathop {{\text{CaC}}{{\text{O}}_{\text{3}}}}\limits_{{\text{(calcium~carbonate)}}} \]

- Formed ammonia in the above reaction as a result of hydrolysis, used by the plants, crops, seeds, etc. as a source of nitrogen fertilizer and it is mainly used in the anhydrous form in the farming. Because anhydrous ammonia is used for dry crops with the water as well as with moisture crops also to maintain a quantitative balance.
Ammonia helps in the growth of plants and also in the process of photosynthesis also.
So, the correct answer is “Option B”.

Note: Some of you may choose option (B) as an answer only by seeing the name calcium which is given in the question also. But that will be wrong, so first you should write the whole equation and then go for the answer.