POST UTME RSU 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
What is the oxidation number of sulfur in H2SO4?
A. +2
B. +4
C. +6
D. +8
Question 2
Determine the number of moles of electrons transferred in the electrolysis of 2.5 L of 0.5 M H2SO4.
A. 1.25 mol
B. 2.5 mol
C. 5.0 mol
D. 6.25 mol
Question 3
A solution contains 0.1 M NaOH. What is the concentration of OH- ions?
A. 0.05
B. 0.1
C. 0.15
D. 0.2
Question 4
A solution contains 0.2 M NaOH. What is the concentration of OH- ions?
A. 0.1
B. 0.2
C. 0.3
D. 0.4
Question 5
A 1.00 M solution of sodium hydroxide (NaOH) is mixed with a 1.00 M solution of hydrochloric acid (HCl). If 50.0 mL of the NaOH solution is added to 50.0 mL of the HCl solution, what is the resulting pH?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 6
The reaction of iron metal with oxygen gas is represented by the equation: 4Fe(s) + 3O2(g) → 2Fe2O3(s). If 2.00 g of iron metal is burned in air, what is the volume of oxygen gas consumed?
A. 1.00 L
B. 2.00 L
C. 3.00 L
D. 4.00 L
Question 7
What is the oxidation number of oxygen in H2O?
A. +1
B. +2
C. +3
D. +4
Question 8
A 1.0 M solution of glu\cose is diluted to 0.1 M. What is the volume of the solution that is required to obtain 100 mL of the diluted solution?
A. 10 mL
B. 20 mL
C. 50 mL
D. 100 mL
Question 9
A 1.0 L solution of a 0.1 M NaCl is mixed with 1.0 L of a 0.2 M NaCl solution. Calculate the resulting concentration of NaCl and the osmotic pressure of the solution at 298 K.
A. 0.15 M, 2.5 atm
B. 0.2 M, 3.0 atm
C. 0.25 M, 3.5 atm
D. 0.3 M, 4.0 atm
Question 10
A 2.0 g sample of a polymer is dissolved in 50 mL of solvent. Calculate the molar mass of the polymer if the osmotic pressure is 1.5 atm at 25°C.
A. 100 g/mol
B. 200 g/mol
C. 500 g/mol
D. 1000 g/mol
Question 11
The diagram below shows a titration setup. What is the purpose of the burette?
A. To measure the volume of the titrant
B. To measure the volume of the analyte
C. To mix the titrant and analyte
D. To measure the pH of the solution
Question 12
The diagram below shows a simple apparatus setup. What is the purpose of the burette?
A. to measure the volume of a solution
B. to measure the mass of a subs\tance
C. to measure the temperature of a solution
D. to measure the pH of a solution
Question 13
A 2.00 M solution of sodium hydroxide (NaOH) is mixed with a 1.00 M solution of hydrochloric acid (HCl). If 50.0 mL of the NaOH solution is added to 100.0 mL of the HCl solution, what is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 14
A 2.5 L flask contains 0.25 M H2SO4. What is the number of moles of H2SO4?
A. 0.0625
B. 0.125
C. 0.25
D. 0.5
Question 15
A 2.0 g sample of a metal carbonate (M2CO3) is heated to produce a metal oxide (MO). If the mass of the metal oxide produced is 1.2 g, calculate the molar mass of the metal (M).
A. 40 g/mol
B. 60 g/mol
C. 80 g/mol
D. 100 g/mol

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