POST UTME BSU 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution of copper(II) sulfate (CuSO4) is electrolyzed u\sing a copper electrode. If the anode is made of copper, what is the reaction at the anode?
A. Cu2+ + 2e- → Cu
B. Cu → Cu2+ + 2e-
C. Cu2+ + 2e- → Cu2O
D. Cu → Cu2O + 2e-
Question 2
The reaction of a metal with a non-metal to form a metal halide is an example of a ______________ reaction.
A. synthesis reaction
B. decomposition reaction
C. \single displacement reaction
D. double displacement reaction
Question 3
Determine the s\tandard enthalpy of formation of CaCO3(s) from the following data: ΔHf(CaO(s)) = -635.09 kJ/mol, ΔHf(CO2(g)) = -393.51 kJ/mol.
A. -1206.60 kJ/mol
B. -1206.60 kJ/mol
C. -1206.60 kJ/mol
D. -1206.60 kJ/mol
Question 4
The reaction of a strong acid with a weak base is an example of a ______________ reaction.
A. neutralization reaction
B. oxidation-reduction reaction
C. precipitation reaction
D. exchange reaction
Question 5
Determine the rate cons\tant (k) for the reaction: 2NO(g) + O2(g) → 2NO2(g), given that the initial concentrations of NO and O2 are 0.1 M and 0.2 M, respectively, and the rate of reaction is 0.05 M/s after 10 minutes.
A. \( k = \frac{2.303}{t} \log left\( \frac{[NO]_0 [O_2]_0}{[NO_2]_t^2} \right \ \) )
B. \( k = \frac{2.303}{t} \log left\( \frac{[NO]_t [O_2]_t}{[NO]_0 [O_2]_0} \right \ \) )
C. \( k = \frac{2.303}{t} \log left\( \frac{[NO]_0 [O_2]_0}{[NO]_t [O_2]_t} \right \ \) )
D. \( k = \frac{2.303}{t} \log left\( \frac{[NO]_t [O_2]_t}{[NO]_0 [O_2]_0} \right \ \) )
Question 6
The reaction of a metal with a non-metal to form an ionic compound is an example of a ______________ reaction.
A. synthesis reaction
B. decomposition reaction
C. \single displacement reaction
D. double displacement reaction
Question 7
A 0.1 M solution of NaOH is titrated with 0.1 M HCl. If the initial pH is 12, calculate the pH after 10 mL of HCl has been added.
A. \( pH = \frac{1}{2} left\( pH_0 + pH_f \right \ \) )
B. \( pH = \frac{1}{2} left\( pH_0 + pH_f \right \ \) \times \frac{V}{V_0} )
C. \( pH = \frac{1}{2} left\( pH_0 + pH_f \right \ \) \times \frac{V}{V_0} \times \frac{C}{C_0} )
D. \( pH = \frac{1}{2} left\( pH_0 + pH_f \right \ \) \times \frac{V}{V_0} \times \frac{C}{C_0} \times \frac{t}{t_0} )
Question 8
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution after 25 mL of 0.1 M HCl is added to 50 mL of the solution?
A. 1
B. 2
C. 3
D. 4
Question 9
A 25.0-mL sample of a 0.100 M solution of NaCl is mixed with 50.0 mL of a 0.200 M solution of AgNO3. What is the concentration of the resulting solution?
A. 0.0500 M
B. 0.0500 M
C. 0.0500 M
D. 0.0500 M
Question 10
A diagram of a titration setup is shown below. If 25 mL of 0.1 M HCl is added to 25 mL of 0.1 M NaOH, what is the pH of the resulting solution?
A. 7
B. 8
C. 9
D. 10
Question 11
A diagram of a simple black and white chemistry apparatus showing a titration setup is shown below. If 25 mL of 0.1 M HCl is added to 25 mL of 0.1 M NaOH, what is the pH of the resulting solution?
A. 7
B. 8
C. 9
D. 10
Question 12
A solution of sodium hydroxide (NaOH) is titrated with a solution of hydrochloric acid (HCl). If 25 mL of NaOH solution is required to neutralize 20 mL of HCl solution, what is the concentration of the NaOH solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 13
The half-life of a radioactive subs\tance is 10 years. If the initial activity is 100 Bq, calculate the activity after 20 years.
A. \( A = A_0 \times left\( \frac{1}{2} \right \ \)^{n} )
B. \( A = A_0 \times left\( \frac{1}{2} \right \ \)^{t} )
C. \( A = A_0 \times left\( \frac{1}{2} \right \ \)^{\frac{t}{t_{1/2}}} )
D. \( A = A_0 \times left\( \frac{1}{2} \right \ \)^{\frac{t}{t_{1/2}} \times 2} )
Question 14
A 2.5 g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide gas. If the metal oxide has a molar mass of 120 g/mol and the carbonate has a molar mass of 100 g/mol, calculate the number of moles of carbon dioxide gas produced.
A. 0.02 mol
B. 0.03 mol
C. 0.04 mol
D. 0.05 mol
Question 15
A 10.0 mL sample of 0.100 M NaOH is mixed with 10.0 mL of 0.100 M HCl. What is the pH of the resulting solution?
A. 1.0
B. 2.0
C. 3.0
D. 4.0

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Help others prepare! Share this practice hub: