Question

A mixture of calcium cyanamide and carbon is known as:
A. Nitrolim
B. Oleum
C. Hydronium
D. None of these

Answer 1

Hint:
The knowledge about useful chemical mixtures made up of different substances and their corresponding names can be used.

Complete step by step solution
We know that a chemical reaction is understood as a method in which chemical reagents with different compositions react together to give new chemicals. Various chemicals have found different uses when used individually or with other substances. One such mixture is that of calcium cyanamide and carbon. We can see this mixture being used for agricultural purposes due to its nitrogen content mainly in fertilizers and pesticides etc. We know this mixture by the name of nitrolim.

Among other given options, oleum is related to the contact process by which sulfuric acid is manufactured. It formed in the last step of the process when sulfur trioxide gets absorbed in concentrated sulfuric acid. We also know this as fuming sulfuric acid as its dilution gives us the sulfuric acid as per our required concentration.

We have heard about hydronium ions mostly while discussing acid-base equilibria. This is basically a hydrated proton that gives rise to acidity and can be used to represent the same during chemical reactions.

From the above discussion we can conclude that the correct option is A.

Note:
We might get confused for the presence of carbon in the mixture but name being indicative of nitrogen. Well the mixture is nitrogenous which is present as cyanamide and this is the very content which makes it useful.