POST UTME RSU 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.00 g sample of a metal is heated in a Bunsen burner flame, resulting in a 1.50 g loss in mass. What is the atomic mass of the metal?
A. 12.0 g/mol
B. 16.0 g/mol
C. 20.0 g/mol
D. 24.0 g/mol
Question 2
A 2.50 g sample of a metal carbonate is heated to produce a metal oxide and CO2 gas. If the mass of the metal oxide is 2.00 g, calculate the percentage yield of the metal oxide.
A. 80.0%
B. 85.0%
C. 90.0%
D. 95.0%
Question 3
The diagram below shows a titration setup. Identify the part labeled A.
A. Burette
B. Beaker
C. Conical Flask
D. Erlenmeyer Flask
Question 4
Determine the s\tandard enthalpy of formation of cyclohexane (C6H12) from the s\tandard enthalpies of formation of its constituent elements.
A. -123.0 kJ/mol
B. -123.5 kJ/mol
C. -124.0 kJ/mol
D. -124.5 kJ/mol
Question 5
A 2.00 M solution of K2Cr2O7 is reduced by adding 1.00 M H2SO4. What is the concentration of Cr3+ ions in the solution after the reaction is complete?
A. 0.500 M
B. 0.750 M
C. 1.00 M
D. 1.25 M
Question 6
A 0.500 M solution of NaOH is titrated with 0.500 M HCl. What is the pH of the solution after 25.0 mL of HCl has been added?
A. 2.00
B. 2.50
C. 3.00
D. 3.50
Question 7
A 2.00 g sample of a metal hydroxide is dissolved in water to produce a solution with a pH of 10.5. Calculate the concentration of the metal ion in the solution.
A. 0.010 M
B. 0.050 M
C. 0.100 M
D. 0.500 M
Question 8
A 0.5 M solution of a weak base B is mixed with 0.1 M HCl. If the initial volume of the base solution is 100 mL, what is the pH of the resulting solution after the reaction is complete?
A. 2.5
B. 3.5
C. 4.5
D. 5.5
Question 9
Calculate the concentration of a solution containing 25 g of glu\cose in 250 mL of water.
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 10
Determine the pH of a solution containing 0.1 M HCl and 0.1 M NaOH.
A. 1
B. 2
C. 3
D. 4
Question 11
A sample of a non-metals compound contains 0.5 g of carbon and 0.2 g of oxygen. What is the empirical formula of the compound?
A. CO
B. C2O
C. CO2
D. C3O2
Question 12
The s\tandard enthalpy of formation (ΔHf) for CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation for CO(g)?
A. -110.5 kJ/mol
B. -210.5 kJ/mol
C. -310.5 kJ/mol
D. -410.5 kJ/mol
Question 13
The reaction 2A(g) + 3B(g) → 5C(s) is a redox reaction. Identify the oxidizing agent.
A. A
B. B
C. C
D. None of the above
Question 14
A 25.0 mL sample of 0.100 M NaOH is mixed with a 50.0 mL sample of 0.0500 M HCl. What is the resulting pH?
A. 2.00
B. 2.50
C. 3.00
D. 3.50
Question 15
A 15.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. What is the pH of the solution after the addition of 15.0 mL of NaOH?
A. 1
B. 2
C. 3
D. 4

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