Which of the following statements about catalyst is false?

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Which of the following statements about catalyst is false?

• A. Biological catalysts are called enzymes
• B. Catalysts do not appear in the balanced equation
• C. Catalysts reduce the activation energy for a reaction
• D. Catalysts do not alter the mechanism of the reaction and never appear in the rate law

QUICK ANSWER…

D

DETAILS…  

Catalysts are substances whose presence alters the rate of chemical reactions.

Catalysts themselves do not react, but causes other substances they are in contact with, to react. Therefore, catalysts remain unchanged at the end of the reaction.

Now for the right answer to the above question:

1. Option A is incorrect. Yes, organic catalysts are called enzymes, they alter the rate of biochemical reactions, this option is not false.
2. Option B is incorrect. This option is not false, catalysts do not appear among the reactants nor the products.
3. C is incorrect. Yes, catalysts quicken the rate of chemical reactions by lowering the activation energy.
4. D is the correct answer. Although the second part of this option is correct (catalysts do not appear in rate law); however, catalysts do alter the mechanism of chemical reactions by making it quicker. This option is generally false.

KEY-POINTS…

You may please note these/this:

• Although some chemical equations feature catalysts written along the line between the reactants and the products, this is not compulsory, catalysts do not appear as part of reactants or products.
• Catalysts alters the mechanism of a chemical reaction by reducing the time of completion of the reaction.
• Catalysts manage to hasten chemical reactions by taking hold of their activation energy, reducing and making them lower.

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/ culled from 2019 JAMB-UTME Chemistry question 28 /