Question

Which statement about a catalyst is incorrect?

a)The presence of a catalyst speeds up a reaction

b)The presence of a catalyst changes the rate of a reaction

c)In some reactions, one of the products acts as a catalyst for the forward reaction

d)During use, a catalyst may be poisoned​

Answer 1

Answer:

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Explanation:

Catalyst is any substance that increases the rate of a reaction without itself being consumed.

The most important properties of catalysts are:

1. A catalyst increases the speed of a reaction, and it also improves the yield of the intended product.

2. A catalyst actually takes part in the reaction even though it itself is not consumed or used up in the course of the reaction.

3. A catalyst makes the reaction faster by providing an alternative pathway with a lower activation energy.

4. A catalyst is reaction-specific. It may not be effective in another reaction even if the two reactions are of similar type.

5. In a reversible reaction,  a catalyst accelerates both the forward and the reverse reactions. So, the inclusion of a catalyst does not alter the equilibrium constant of a reversible reaction.

6.A catalyst can accelerate the rate of reaction but it can't initiate the reaction thus donot alter the spontaneity or ΔG  

∘

 of the reaction

Therefore option C and D are correct

Answer 2

B) is the correct statement on catalysts as they alter the reaction's rate.

Catalyst

• In Chemistry, catalysts are characterized as those substances which adjust the pace of response by changing the way of response. More often than not an catalyst is utilized to accelerate or expand the pace of the response. Be that as it may, assuming we go to a more profound level, catalyst are utilized to break or modify the substance connections between the iotas which are available in the particles of various components or mixtures.
• Basically, catalysts urge particles to respond and make the entire response process more straightforward and productive.The important points to remember are: A catalyst doesn't start a substance reaction. A catalyst doesn't be consumed in the response.
• catalyst will generally respond with reactants to frame intermediates and simultaneously work with the creation of the last response item. After the entire cycle, an impetus can recover.
• A catalyst can be either strong, fluid or vaporous impetuses. A portion of the strong impetuses incorporates metals or their oxides, including sulfides, and halides. Semi-metallic components like boron, aluminium, and silicon are additionally utilized as catalysts. Similarly, fluid and vaporous components which are in the unadulterated structures are utilized as impetuses. In some cases, these components are likewise utilized alongside reasonable solvents or transporters.
• The response which includes a catalyst in their framework is known as a synergist response. All in all, synergist activity is a substance response between the impetus and a reactant. This outcome in the development of synthetic intermediates that can additionally respond promptly with one another or with one more reactant to frame an item. Nonetheless, when the response between the synthetic intermediates and the reactants happens or happens the impetus is recovered.

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