POST UTME AL-HIKMAH UNIVERSITY 2025 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The compound with the molecular formula C6H12O6 is an example of a carbohydrate. What is the IUPAC name of this compound?
A. Glu\cose
B. Fructose
C. Sucrose
D. Lactose
Question 2
A sample of a polymer has a molecular weight of 50,000 g/mol. If 1.00 g of the polymer is dissolved in 100 mL of solvent, what is the concentration of the solution in g/L?
A. 10^3 g/L
B. 10^4 g/L
C. 10^5 g/L
D. 10^6 g/L
Question 3
The s\tandard electrode potential (E°) for the reaction Cu^2+(aq) + 2e^\( - \) → Cu(s) is +0.34 V. What is the s\tandard electrode potential (E°) for the reaction Cu(s) → Cu^2+(aq) + 2e^\( - \)?
A. -0.34 V
B. -0.17 V
C. +0.17 V
D. +0.34 V
Question 4
A metal (M) reacts with oxygen (O2) to produce a metal oxide (MO). The reaction is as follows: 4M + 3O2 -> 2MO. If 2.5 g of M reacts with 10 mL of 2 M O2, what is the molar mass of M?
A. 50 g/mol
B. 75 g/mol
C. 100 g/mol
D. 125 g/mol
Question 5
The s\tandard electrode potential (E°) for the reaction Zn(s) + 2Ag^+(aq) → Zn^2+(aq) + 2Ag(s) is +0.76 V. What is the s\tandard electrode potential (E°) for the reaction Zn^2+(aq) + 2e^\( - \) → Zn(s)?
A. -0.76 V
B. -0.38 V
C. +0.38 V
D. +0.76 V
Question 6
A 0.1 M solution of NaOH is prepared by dissolving 4 g of NaOH in enough water to make 1 L of solution. What is the concentration of H+ ions in the solution?
A. 1 x 10^\( -13 \) M
B. 1 x 10^\( -14 \) M
C. 1 x 10^\( -15 \) M
D. 1 x 10^\( -16 \) M
Question 7
The compound with the molecular formula C4H10 is an example of an alkane. What is the IUPAC name of this compound?
A. Bu\tane
B. Pen\tane
C. Hexane
D. Hep\tane
Question 8
A metal 'A' reacts with oxygen to form a basic oxide. The reaction is as follows: 4A + 3O2 → 2A2O3. If 2.5 g of metal 'A' reacts with 50 cm³ of oxygen at STP, calculate the volume of oxygen required at STP.
A. 50 cm³
B. 75 cm³
C. 100 cm³
D. 125 cm³
Question 9
The reaction between chlorine gas and potassium bromide is an example of a redox reaction. What is the oxidation state of bromine in potassium bromide?
A. 0
B. -1
C. +1
D. +2
Question 10
The compound with the molecular formula C2H4O is an example of an aldehyde. What is the IUPAC name of this compound?
A. Acetaldehyde
B. Propionaldehyde
C. Butyraldehyde
D. Pen\tanal
Question 11
The s\tandard enthalpy of formation of ammonia (NH3) is -45.9 kJ/mol. The s\tandard enthalpy of formation of hydrogen (H2) is 0 kJ/mol. The s\tandard enthalpy of formation of nitrogen (N2) is 0 kJ/mol. Calculate the s\tandard enthalpy of formation of hydrogen cyanide (HCN) u\sing the following equation: N2 + 3H2 → 2NH3, followed by 2NH3 + HCN → 2NH4CN.
A. -92.1 kJ/mol
B. -102.1 kJ/mol
C. -112.1 kJ/mol
D. -122.1 kJ/mol
Question 12
The reaction between sodium hydroxide and hydrochloric acid is an example of a neutralization reaction. What is the products of this reaction?
A. Sodium chloride and water
B. Sodium hydroxide and hydrochloric acid
C. Sodium carbonate and water
D. Sodium sulfate and water
Question 13
A 10.0 mL sample of a 0.500 M solution of NaOH is titrated with a 0.500 M solution of HCl. If the equivalence point is reached at 25.0 mL of HCl, what is the concentration of the HCl solution?
A. 0.250 M
B. 0.500 M
C. 0.750 M
D. 1.00 M
Question 14
A 0.1 M solution of NaOH is prepared by dissolving 4 g of NaOH in enough water to make 1 L of solution. What is the concentration of OH^- ions in the solution?
A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.5 M
Question 15
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. If the pH of the resulting solution is 7.00, what is the volume of NaOH added?
A. 12.5 mL
B. 25.0 mL
C. 37.5 mL
D. 50.0 mL

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