An example for autocatalysis is
- oxidation of $NO$ to $NO_2$
- oxidation of $SO_2$ to $SO_3$
- decomposition of $KClO_3$ to $KCl$ and $O_2$
- oxidation of oxalic acid by acidified $KMnO_4$
The Correct Option is D
Solution and Explanation
e.g. ,$ 2KMnO_4 + 5H_2C_2O_4 + 3H_2SO_4 \to$
$K_2SO_4 + \underset{\text{(acts as catalyst)}}{{2MnSO_4}} +8H_2O + 10CO_2 $
The pink colour of $ KMnO_4 $disappears slowly on reaction with oxalic acid, but the rate of disappearance of colour fastens after some time due to the formation of $MnSO_4$ which acts as auto catalyst for the reaction.
Top Questions on Surface Chemistry
- The adsorbent used in adsorption chromatography is/are
A. silica gel
B. alumina
C. quick lime
D. magnesia
Choose the most appropriate answer from the options given below :- JEE Main - 2024
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- Adsorption' principle is used for which of the following purification method?
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In the given TLC, the distance of spot \( A \) and \( B \) are 5 cm and 7 cm, from the bottom of the TLC plate, respectively. The \( R_f \) value of \( B \) is \( x \times 10^{-1} \) times more than \( A \). The value of \( x \) is _________ .- JEE Main - 2024
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[Use given data: Surface area of charcoal = 1.5 x 102 m2g−1 ; Avogadro’s number (NA) = 6.0 x 1023 mol−1 ]- JEE Advanced - 2024
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Which compound is added to cement to increase its setting time?
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Questions Asked in KCET exam
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- If \(p(\frac{1}{q}+\frac{1}{r}),q(\frac{1}{r}+\frac{1}{p}),r(\frac{1}{p}+\frac{1}{q})\) are in A.P., then p, q, r
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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.