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Powdered calcium carbonate reacts faster with hydrochloric acid than marble chips of the same mass. Which factor explains this difference in rate?
AAddition of a suitable catalyst
BIncreased concentration of the acid
CIncreased temperature of the mixture
DIncreased surface area of the reactant
Answer & Solution
Correct answer: D. Increased surface area of the reactant
1. Powder and chips of the same substance differ only in how finely divided the solid is.
2. Powdering increases the surface area exposed to the acid, so more particles collide and react.
3. The acid concentration and temperature are unchanged, and no catalyst is added, so those factors are ruled out.
4. Therefore the increased surface area explains the faster rate.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 10 Types of Chemical Reactions "Surface area of the reactants", p.153_
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