Post-UTME Chemistry 2019 Objective — Question 10

Question 10 of 20 from the Post-UTME Screening (Post-UTME) Chemistry 2019 Objective paper, with the correct answer and a full explanation.

Use the table below (Initial conc. of H2 in moles: 1.00, 2.00, 3.00, 4.00; Initial Rate: 20.00, 40.00, 60.00, 80.00) to answer this question. These results suggest that when the initial concentration of hydrogen is doubled, the rate of reaction is

A. doubledCorrect
B. tripled
C. quadrupled
D. unchanged

Explanation

Doubling the H2 concentration from 1.00 to 2.00 doubles the rate from 20.00 to 40.00, showing rate is directly proportional to (doubled with) concentration.

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