Which of the following will NOT increase the rate of a reaction between a solid and a solution?
Correct answer: C. Increasing the volume of solvent without adding more solute
- A. Raising the temperature
- B. Powdering the solid
- C. Increasing the volume of solvent without adding more solute
- D. Adding a suitable catalyst
Explanation
Adding solvent alone dilutes the solution, so the concentration of the reacting species falls and collisions become less frequent, which slows the reaction rather than speeding it. Heating, increasing surface area and adding a catalyst all raise the frequency or the effectiveness of collisions. Note that a larger volume gives more total reactant but a lower concentration, and rate depends on concentration.
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About Factors Affecting Rate of Reaction
Reaction rate depends on the nature and concentration of reactants, pressure for gases, temperature, surface area and catalysts. Collision theory explains these effects through collision frequency, orientation and activation energy, while questions often distinguish a catalyst's effect on reaction rate from its lack of effect on equilibrium composition.
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