JPJC 2026 Reaction Kinetics MCQ

2026 JPJC J1 H2 Chemistry (9476) 1 JURONG PIONEER JUNIOR COLLEGE 2026 JC1 H2 Chemistry (9476) MCQ Quiz Topic 6: Reaction Kinetics Name : _________________________________________ 5 Class : 26S____ Date : ____________ Duration : 10 minutes Question 1 2 3 4 5 Answer 1 The equation for the reduction of nitrogen monoxide is shown below. 2H2 + 2NO → N2 + 2H2O From initial rates experiments, the following rate equation was derived. rate = k [H2] [NO]2 The results of the initial rates experiments are shown. initial [H2] / mol dm−3 initial [NO] / mol dm−3 initial rate / mol dm−3 min−1 0.5 2.0 6.0 0.5 1.0 x 1.0 1.0 y 1.0 z 0.75 What are the missing values, x, y and z? x y z A 1.5 3.0 0.25 B 1.5 3.0 0.5 C 3.0 6.0 0.125 D 3.0 6.0 0.25 2 The half-life of the first-order gaseous reaction in which X2 molecules become converted into X atoms is 30 minutes. X2(g) → 2X(g) 1 mol of X 2 is put into a sealed vessel at a pressure p. What will be true when 75% of X 2 has been converted into X atoms? 1 60 minutes have elapsed. 2 1.5 mol of X atoms have been formed. 3 The total pressure is 7 4 p (at constant temperature). A 1, 2 and 3 B 1 and 2 only C 1 only D 2 and 3 only

2026 JPJC J1 H2 Chemistry (9476) 2 3 In the conversion of compound X into compound Z, it was found that the reaction proceeded by way of compound Y, which could be isolated. The following steps were involved. Step 1 X → Y Step 2 Y → Z Which of the following statements is true about the energy profile below? A E4 represents the energy level of compound Y. B H for step 1 is positive and H for step 2 is negative. C The enthalpy change of the reaction is E2 – E1. D Step 2 is the slowest step since its peak is the highest. 4 A chemist conducts two separate experiments on the reaction between dilute HCl and zinc in beaker 1 and beaker 2. She uses different samples of dilute HCl and zinc for both beakers. The rate of the reaction in beaker 1 is lower than the rate of the reaction in beaker 2. Which factor could help to explain this observation? A The acid in beaker 1 is at a higher concentration than the acid in beaker 2. B The reaction in beaker 1 has a higher activation energy than the reaction in beaker 2. C The acid in beaker 1 is of a larger volume than the acid in beaker 2. D The zinc in beaker 1 is in larger pieces than the zinc in beaker 2. 5 An autocatalytic reaction is a reaction in which one of the products catalyses the reaction. Which curve was obtained if the rate of reaction was plotted against time for an autocatalytic reaction? energy progress of reaction E1 E5 E2 X Z E3 E4