Q84 / 270 · NDA 2026 (Phase 1) · General Ability
Which of the following statements is/are correct with regard to Nitrolim?
I. It is prepared by heating calcium carbide with nitrogen.
II. It decomposes into ammonia in soil.
III. It is an NPK fertilizer.
IV. It is an organic fertilizer.
Select the answer using the code given below.
I. It is prepared by heating calcium carbide with nitrogen.
II. It decomposes into ammonia in soil.
III. It is an NPK fertilizer.
IV. It is an organic fertilizer.
Select the answer using the code given below.
- Correct answerAI and II only
- BI, II and III
- CIV only
- DI, II and IV
Solution
Nitrolim is a mixture of calcium cyanamide ($CaCN_2$) and carbon ($C$).
It is prepared by heating calcium carbide with nitrogen gas at a high temperature.
$CaC_2 + N_2 \rightarrow CaCN_2 + C$
Thus, statement I is correct.
In the soil, nitrolim reacts with moisture to release ammonia gas, which provides nitrogen to the plants.
$CaCN_2 + 3H_2O \rightarrow CaCO_3 + 2NH_3$
Thus, statement II is correct.
Nitrolim provides only nitrogen to the soil, making it a nitrogenous fertilizer, not an NPK fertilizer. Thus, statement III is incorrect.
Nitrolim is an inorganic fertilizer, not an organic fertilizer. Thus, statement IV is incorrect.
Therefore, only statements I and II are correct.
Answer: I and II only
It is prepared by heating calcium carbide with nitrogen gas at a high temperature.
$CaC_2 + N_2 \rightarrow CaCN_2 + C$
Thus, statement I is correct.
In the soil, nitrolim reacts with moisture to release ammonia gas, which provides nitrogen to the plants.
$CaCN_2 + 3H_2O \rightarrow CaCO_3 + 2NH_3$
Thus, statement II is correct.
Nitrolim provides only nitrogen to the soil, making it a nitrogenous fertilizer, not an NPK fertilizer. Thus, statement III is incorrect.
Nitrolim is an inorganic fertilizer, not an organic fertilizer. Thus, statement IV is incorrect.
Therefore, only statements I and II are correct.
Answer: I and II only
Hence, the correct answer is option: 'A'.