POST UTME IMS U 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.5 g sample of an unknown hydrocarbon is burned in a combustion calorimeter. The volume of oxygen consumed is 2.1 L at 25°C and 1 atm. The volume of carbon dioxide produced is 1.8 L at 25°C and 1 atm. Calculate the empirical formula of the hydrocarbon.
A. C2H4
B. C3H6
C. C4H8
D. C5H10
Question 2
A polymer has a molecular weight of 100,000 g/mol and a degree of polymerization of 500. What is the molar mass of the repeating unit of the polymer?
A. 100 g/mol
B. 200 g/mol
C. 500 g/mol
D. 1000 g/mol
Question 3
The reaction between ethanol (C2H5OH) and oxygen (O2) produces carbon dioxide (CO2) and water (H2O). Write the balanced chemical equation for this reaction.
A. C2H5OH + O2 → CO2 + H2O
B. C2H5OH + 2O2 → 2CO2 + 2H2O
C. C2H5OH + O2 → 2CO2 + H2O
D. C2H5OH + 2O2 → CO2 + 2H2O
Question 4
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, ΔHf(C(s)) = 0 kJ/mol.
A. -1206.60 kJ/mol
B. -1206.19 kJ/mol
C. -1206.99 kJ/mol
D. -1207.01 kJ/mol
Question 5
A diagram of a titration setup is shown below. What is the concentration of the NaOH solution?
A. 0.100 M
B. 0.200 M
C. 0.300 M
D. 0.400 M
Question 6
A 1.0 M solution of H2SO4 is mixed with a 1.0 M solution of NaOH. What is the resulting solution?
A. Na2SO4 and H2O
B. NaHSO4 and H2O
C. Na2SO4 and NaOH
D. NaHSO4 and NaOH
Question 7
A 2.0 M solution of H2SO4 is mixed with a 1.0 M solution of NaOH. Calculate the pH of the resulting solution.
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 8
The reaction between sodium (Na) and chlorine (Cl2) produces sodium chloride (NaCl). Write the balanced chemical equation for this reaction.
A. 2Na + Cl2 → 2NaCl
B. Na + Cl2 → NaCl
C. 2NaCl + Cl2 → 2Na
D. NaCl + Cl2 → Na
Question 9
Determine the pH of a 0.1 M solution of sulfuric acid (H2SO4) u\sing the equation pH = -\log[H+].
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 10
Determine the concentration of a 0.5 M solution of NaOH that has been diluted to 1.5 L. What is the new concentration in units of M?
A. 0.25 M
B. 0.33 M
C. 0.5 M
D. 1.0 M
Question 11
The reaction of sulfur with oxygen to form sulfur dioxide is an example of a combustion reaction. What is the balanced chemical equation for this reaction?
A. S + O_2 \rightarrow SO
B. S + O_2 \rightarrow SO_2
C. S + O_2 \rightarrow SO_3
D. S + O_2 \rightarrow SO_4
Question 12
The pH of a solution is 4. If the concentration of H+ ions is 1.0 x 10^\( -4 \) M, calculate the pOH of the solution.
A. 10
B. 9
C. 8
D. 7
Question 13
The molar mass of a subs\tance is 50 g/mol. If a 2.0 g sample has a volume of 10 cm^3, calculate the density of the subs\tance.
A. 5 g/cm^3
B. 10 g/cm^3
C. 15 g/cm^3
D. 20 g/cm^3
Question 14
Determine the number of moles of ethane (C2H6) that can be produced from 2.5 moles of ethene (C2H4) in a reaction where 1 mole of ethene produces 1 mole of ethane.
A. 1.0 mole
B. 2.0 moles
C. 2.5 moles
D. 3.0 moles
Question 15
The pH of a solution is 3. If the concentration of H+ ions is 1.0 x 10^\( -3 \) M, calculate the pOH of the solution.
A. 11
B. 10
C. 9
D. 8

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