The reaction which is second order:
Correct answer: B. Formation of FeI2
- A. Decomposition of N2O5
- B. Formation of FeI2
- C. Formation of Glucose in plants
- D. Chlorination of methane in sunlight
Explanation
The correct answer is the formation of FeI2, as it is a second-order reaction where the rate is determined by the concentrations of both iron (Fe) and iodine (I2). For this reaction, the rate equation is Rate = k [Fe] [I2].The decomposition of N2O5 is a first-order reaction, as the rate depends only on the concentration of N2O5. The formation of glucose in plants during photosynthesis is also typically a first-order reaction with respect to CO2. Similarly, the chlorination of methane in sunlight involves a first-order dependency on the concentration of CH4.
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Reaction kinetics relates reaction rate to concentration, temperature, surface area and catalysts. Questions cover rate laws, reaction order, rate constants, activation energy and the activated complex, including how a catalyst lowers the activation energy without changing the overall energy change or equilibrium position.
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