Advertisements
Advertisements
Question
How does a solid catalyst enhance the rate of combination of gaseous molecules?
Advertisements
Solution
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.
APPEARS IN
RELATED QUESTIONS
What is the role of desorption in the process of catalysis?
Which of the following is obtained by catalytic oxidation of ammonia?
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.
What do you understand by shape selective catalysis? Why are zeolites good shape selective catalysts?
\[\ce{H2}\] 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.]
