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CaCO$_3$ powder reacts faster with concentrated HCl than with dilute HCl. This observation demonstrates that the rate of a reaction depends on the:
Apresence of a catalyst
Bconcentration of the reactants
Cnature of the reactants
Dsize of the reactant particles
Answer & Solution
Correct answer: B. concentration of the reactants
1. The same reactants (CaCO$_3$ and HCl) and particle size are used; only the acid concentration changes.
2. Concentrated HCl reacts rapidly while dilute HCl reacts slowly.
3. So the rate is proportional to the concentration of the reactants.
4. Nature and particle size are unchanged here, and no catalyst is added, so those options are wrong.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 3 "Chemical Reactions and Equations", p.49_
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