A certain reaction occurs in two steps as
i) $\ce{2SO_{2(g)} + 2NO_{2(g)} -> 2SO_{3(g)} + 2NO_{(g)} }$
ii) $\ce{2NO_{(g)} + O_2(g) -> 2NO_{2(g)}}$
In the reaction,
- $\ce{NO_{2(g)} }$ is intermediate
- $\ce{NO_{(g)} }$ is intermediate
- $\ce{NO_{(g)} }$ is catalyst
- $\ce{O_{2(g)} }$ is intermediate
The Correct Option is B
Solution and Explanation
Step I:
$2 SO _{2}(g)+2 NO _{2}(g) \to 2 SO _{3}(g)+2 NO (g)$
Step II : $2 NO (g)+ O _{2}(g) \to 2 NO _{2}(g)$
An intermediate formed in the reaction is not a part of overall reaction.
Net reaction : $2 SO _{2}(g)+ O _{2}(g) \to 2 SO _{3}(g)$
As, $NO(g)$ formed in first elementary step is neither a reactant nor a product in the net reaction. It is formed in one elementary step and consumed in the next step. Thus, $NO (g)$ acts as an intermediate.
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Concepts Used:
Surface Chemistry
The study of the chemical phenomena that occur at the interface of two surfaces which can be solid-liquid, solid-gas, solid-vacuum, liquid-gas, etc.
Read Also: Surface Chemistry
Applications of surface chemistry are:
Adsorption:
The process of attraction and aggregation of the molecules of a substance on the surface of a solid is known as adsorption. For Example, N2 adsorbs on the surface of activated charcoal
Two types of adsorption are:-
- Chemisorption: It is also known as Chemical Adsorption.
- Physisorption: It is also known as Physical Adsorption.
Corrosion:
The process through which the refined metals convert themselves into more stable compounds is known as corrosion.
Crystallisation:
The type of technique used in order to purify the substances to separate Solids from liquids is known as crystallisation.
Heterogeneous Catalysis:
The process wherein a catalyst is used in order to increase the rate of a chemical reaction is known as catalysis. The catalyst does not undergo any transformation and can be recovered in a chemically unchanged state.
There are two types of catalysis:-
- When the catalyst involved and the reacting substances are same states of matter or in the same phase, it is known as Homogeneous Catalysis.
- When the catalyst involved and the reacting substances are in different states of matter or different phases, it is known as Heterogeneous Catalysis.