Fertilizer terminology:\n“Nitrolime” is chemically known as which compound?

Introduction / Context:
Trade names and common names for fertilizers can be confusing because similar-sounding terms refer to different chemical compounds. “Nitrolime” is a traditional name that does not correspond to calcium nitrate, ammonium nitrate, or CAN. Recognizing the correct mapping prevents mistakes in nutrient analysis and handling practices.

Given Data / Assumptions:

• “Nitrolime” historically refers to a nitrogenous fertilizer produced by the calcium carbide–derived cyanamide route.
• Modern product labeling may vary by country, but classical chemistry texts are consistent.
• Options list common nitrogen fertilizers to test recognition.

Concept / Approach:
“Nitrolime” is the commercial name for calcium cyanamide (CaCN2), a fertilizer that also acts as a soil amendment and nitrification inhibitor under some conditions. It is distinct from calcium nitrate [Ca(NO3)2], ammonium nitrate [NH4NO3], and mixtures like calcium ammonium nitrate (CAN). Since “calcium cyanamide” is not among the selectable answers except as a distractor in the extended list, “None of these” is the correct choice within the options presented.

Step-by-Step Solution:

Verification / Alternative check:
Reference tables of fertilizer common names clearly list nitrolime as calcium cyanamide, historically produced from calcium carbide and nitrogen at high temperature.

Why Other Options Are Wrong:

• Calcium nitrate, ammonium nitrate, and CAN are different salts with distinct properties and analyses.

Common Pitfalls:
Confusing “lime” in the name with calcium nitrate or CAN; the “nitro” element here refers to nitrogen content via cyanamide chemistry, not nitrate.

Final Answer:
None of these.