Question

${\text{N}}{{\text{H}}_3} + {{\text{O}}_2}\xrightarrow{{{\text{Pt}}}}{\text{A + }}{{\text{H}}_2}{\text{O}}$
Identify the compound A.
A. ${\text{NO}}$
B. ${\text{N}}{{\text{O}}_2}$
C. ${\text{N}}{{\text{O}}_3}$
D. ${\text{HN}}{{\text{O}}_3}$

Answer 1

We can find the missing product in many ways. Law of conservation of mass, type of reaction etc, these factors can help you to find out the unknown compound in the above given equation. Practicing more is the main thing to find the unknown compound.

Complete step by step answer:
When ammonia reacts with oxygen in the presence of Pt, nitric oxide and water are produced. The missing compound in the above equation is “NO”. therefore, option A is correct. The above reaction is a combustion reaction as oxygen is present. The above reaction is also a displacement reaction.
Therefore, the reaction is
${\text{N}}{{\text{H}}_3} + {{\text{O}}_2}\xrightarrow{{{\text{Pt}}}}{\text{NO + }}{{\text{H}}_2}{\text{O}}$
After balancing the elements on both sides, the balanced equation is:
${\text{4N}}{{\text{H}}_3} + 5{{\text{O}}_2}\xrightarrow{{{\text{Pt}}}}{\text{4NO + 6}}{{\text{H}}_2}{\text{O}}$
Number of atoms of each element on the reactants side is equal to the number of atoms of each element on the products side.
So, the correct answer is “Option A”.

Additional Information:
Combustion reaction: Combustion reaction is the process which occurs in the presence of oxygen. Oxygen reacts with other substances. It releases energy in the form of heat and light. It is an exothermic reaction.
Displacement reaction: in a displacement reaction, the atom or a set an atom is displaced by another atom in a molecule or compound. There are two types of displacement reactions. Displacement reaction is also called a replacement reaction or metathesis reaction.

Note: Reactants are considered as the starting materials and they are written on the left-hand side whereas products are obtained from reactants and they are written on the right-hand side. During the reaction, the bonds that are present between atoms of reactants are broken and the products are formed.