Post-UTME Chemistry 2019 Objective — Question 8

Question 8 of 20 from the Post-UTME Screening (Post-UTME) Chemistry 2019 Objective paper, with the correct answer and a full explanation.

A piece of metal reacts with 2M H2SO4 at 20C to give 50cm3 of H2 in 5 minutes. The same piece reacts with the same acid at the temperature of tC to give 50 cm3 of H2 in 10 minutes. This implies that tC is

A. greater than 20C
B. lower than 20CCorrect
C. equal to 20C
D. equal to 40C

Explanation

The reaction took longer (10 vs 5 minutes) to produce the same volume of gas, meaning it proceeded more slowly - consistent with a lower temperature.

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