Question

Identify the compound A
$N{{H}_{3}}+{{O}_{2}}\xrightarrow{Pt}A+{{H}_{2}}O$
A. $NO$
B. $N{{O}_{2}}$
C. $N{{O}_{3}}$
D. $HN{{O}_{3}}$

Answer 1

Platinum is an element having symbol ( $Pt$ ) and its atomic number is $78$ . In this chemical reaction, it is used as a catalyst for the reduction of ${{O}_{2}}$ and converts it into water. This chemical reaction is known as Ostwald’s process.

Complete step by step answer:
The given chemical reaction is used in Ostwald’s process which converts ammonia into nitric acid with the use of platinum as a catalyst. To get the yield in a short time, the reaction rate is increased with increase in temperature.
Let us see the reaction:
$4N{{H}_{3}}+5{{O}_{2}}\xrightarrow{Pt}4NO+6{{H}_{2}}O$
This is a balanced chemical reaction. This reaction is exothermic, and it is used as a source of heat once it is initiated. The heat of reaction is very high which is $\Delta H=-904KJmo{{l}^{-1}}$
The industrial process is called Ostwald's process.

So, the correct answer is Option B.

Additional information:
Catalyst is defined as a substance which is added to accelerate the rate of reaction with the interaction of products and reactants. It plays a very important role in the chemical reaction. It can never be consumed in the process. The process is known as catalysis. The equilibrium constant is not changed by the catalyst and the catalyst decreases the activation energy. Platinum catalyst is used for hydrogenation of ketone to alcohols and nitro compounds to amines.

Note: Heat of reaction is also known as the change in enthalpy in a chemical reaction at a pressure. It is a state function that means its value does not depend on path.
Also , in this reaction the nitrogen of ammonia gets oxidised to nitrogen gas from $-3$ oxidation state to $0$ oxidation state.