POST UTME RSU 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A diagram of a titration setup is shown below. 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 2
The rate cons\tant (k) for a first-order reaction is 0.0500 s^-1. If the initial concentration of the reac\tant is 0.100 M, what is the concentration after 2.00 minutes?
A. 0.0500 M
B. 0.0750 M
C. 0.100 M
D. 0.125 M
Question 3
A 2.50 g sample of a non-metallic element is found to have a mass of 3.75 g after being heated in a Bunsen burner flame. What is the atomic mass of the element?
A. 12.0 g/mol
B. 16.0 g/mol
C. 20.0 g/mol
D. 24.0 g/mol
Question 4
A 10 mL sample of 0.5 M HCl is titrated with 1 M NaOH. Calculate the number of moles of HCl.
A. 0.25
B. 0.5
C. 0.75
D. 1
Question 5
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 6
The diagram below shows a titration setup. Identify the part labeled A.
A. Burette
B. Beaker
C. Conical Flask
D. Erlenmeyer Flask
Question 7
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 8
A sample of a hydrocarbon contains 0.8 g of carbon and 0.2 g of hydrogen. What is the empirical formula of the compound?
A. C2H4
B. C3H6
C. C4H8
D. C5H10
Question 9
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 10
A 0.5 M solution of a weak acid HA is mixed with 0.1 M NaOH. If the initial volume of the acid 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 11
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
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
A catalyst is added to a reaction mixture containing 1.00 M H2 and 1.00 M O2. What is the expected effect on the reaction rate?
A. The reaction rate decreases.
B. The reaction rate increases.
C. The reaction rate remains unchanged.
D. The reaction rate becomes zero.
Question 14
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 15
A colloidal solution of starch in water is added to a solution of iodine in water. What is the expected result?
A. The solution becomes blue.
B. The solution becomes colorless.
C. The solution becomes purple.
D. The solution becomes yellow.

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