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A catalyst changes a reaction in which specific way?
AIt increases the rate without being consumed
BIt is used up in equal amount as a reactant
CIt always slows down the forward reaction
DIt converts the products back into reactants
Answer & Solution
Correct answer: A. It increases the rate without being consumed
1. A catalyst is defined as a substance that increases the reaction rate.
2. A key feature is that it is not consumed during the reaction.
3. So it is recovered unchanged, ruling out the option that it is used up like a reactant; it speeds up rather than slows the reaction.
4. Therefore a catalyst increases the rate without being consumed.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 10 Types of Chemical Reactions "Catalyst", p.153_
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