POST UTME BABCOCK UNIVERSITY 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1

A 0.1 M solution of a weak acid HA is titrated with 0.1 M NaOH. At the equivalence point, the pH of the solution is 8. Calculate the pKa of the acid.

A. 15

B. 10

C. 5

D. 20

Question 2

A 0.1 M solution of a weak base B is titrated with 0.1 M HCl. At the equivalence point, the pH of the solution is 5. Calculate the pKb of the base.

A. 11

B. 10

C. 5

D. 20

Question 3

A metal M has a s\tandard electrode potential of +0.5 V. Calculate the s\tandard Gibbs free energy change for the oxidation of M.

A. -4.82425 \times 10^4

B. 4.82425 \times 10^4

C. -48242.5

D. 48242.5

Question 4

A solution of 0.1 M NaCl is prepared. Calculate the concentration of Cl^- ions in the solution.

A. 0.1

B. 0.01

C. 0.001

D. 0.0001

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