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कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान 2nd PUC Class 12

How does a solid catalyst enhance the rate of combination of gaseous molecules? - Chemistry

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प्रश्न

How does a solid catalyst enhance the rate of combination of gaseous molecules?

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उत्तर

When gaseous molecules come in contact with the surface of a solid catalyst, a weak chemical combination takes place between the surface of the catalyst and the gaseous molecules takes places, which increases the concentration of reactants on the surface. Different moelcules adsorbed side by side have better chance to react and form new molecules. This enhances the rate of reaction. Also, adsorption is an exothermic process. The heat released in the process of adsorption is utilised in enhancing the reaction rate.

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पाठ 5: Surface Chemistry - Exercises [पृष्ठ ७१]

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एनसीईआरटी एक्झांप्लर Chemistry [English] Class 12
पाठ 5 Surface Chemistry
Exercises | Q III. 65. | पृष्ठ ७१

संबंधित प्रश्‍न

What is the role of desorption in the process of catalysis?


Gaseous CO and gaseous H2 react with each other in presence of catalyst 'X' to form methane and water. 'X' is ____________.


Identify the enzyme 'X' in the following reaction.

\[\ce{H2O2_{(aq)} ->[X] H2O2_{(l)} + 1/2O2_{(g)}}\]


Substance that enhances the activity of a catalyst is known as ____________.


Which of the following process does not occur at the interface of phases?


Which of the following statements are correct about solid catalyst?

(i) Same reactants may give different product by using different catalysts.

(ii) Catalyst does not change ∆H of reaction.

(iii) Catalyst is required in large quantities to catalyse reactions.

(iv) Catalytic activity of a solid catalyst does not depend upon the strength of chemisorption.


Why is desorption important for a substance to act as good catalyst?


Do the vital functions of the body such as digestion get affected during fever? Explain your answer.


\[\ce{H2}\] gas is adsorbed on activated charcoal to a very little extent in comparison to easily liquefiable gases due to:

(i) very strong van der Waal’s interaction.

(ii) very weak van der Waals forces.

(iii) very low critical temperature.

(iv) very high critical temperature.


What is/are the feature/s about microcosmic salt is correct?


Volume of N2 at NTP required to form a monolayer on the surface of iron catalyst is 8.15 ml/g of the adsorbent. If each nitrogen molecule occupies 16 × 10−22 m2. The surface area of the 100 g adsorbent will be ______ × 1018 m2.


Finely divided catalyst has greater surface area and has greater catalytic activity than a compact solid. If a total surface area of 6291456 cm2 is required for adsorption of gaseous reaction in a catalysed reaction, then the number of splits should be made of a cube exactly 1 cm in length is ______.
[Given : After each split new cubes of equal dimensions are formed.]


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