POST UTME OSUSTECH 2018 Chemistry | Objective

Are you preparing for POST UTME OSUSTECH exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2018 Chemistry (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
Determine the oxidation state of the chromium atom in the compound [Cr(H2O)6]Cl3.
Correct A. +3
B. +2
C. +6
D. 0

Correct Answer: A

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Question 2
Calculate the s\tandard enthalpy change (ΔH°) for the reaction: 2Al(s) + Fe2O3(s) → 2Fe(s) + Al2O3(s).
Correct A. -853.9 kJ/mol
B. -853.1 kJ/mol
C. -853.5 kJ/mol
D. -853.7 kJ/mol

Correct Answer: A

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Question 3
The diagram below shows a titration setup. Identify the subs\tance being titrated.
A. NaOH
B. HCl
Correct C. CH3COOH
D. NH3

Correct Answer: C

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Question 4
The reaction 2NO(g) + O2(g) → 2NO2(g) has a rate cons\tant (k) of 0.025 s^-1 at 298 K. Calculate the half-life \( t1/2 \) of the reaction.
Correct A. 14.1 s
B. 14.3 s
C. 14.5 s
D. 14.7 s

Correct Answer: A

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Question 5
The diagram below shows a molecular structure. Identify the type of bond between the two carbon atoms.
Correct A. Sigma (σ) bond
B. Pi (π) bond
C. Sigma (σ) and Pi (π) bond
D. Hydrogen bond

Correct Answer: A

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Question 6
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?
Correct A. \( S + O_2 \rightarrow SO_2 \)
B. \( S + O_2 \rightarrow SO_3 \)
C. \( S + O_2 \rightarrow SO_4 \)
D. \( S + O_2 \rightarrow SO_5 \)

Correct Answer: A

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Question 7
A sample of a hydrocarbon has a molecular formula of C_4H_8. What is the type of hydrocarbon?
A. Alkane
Correct B. Alkene
C. Alkyne
D. Aromatic hydrocarbon

Correct Answer: B

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Question 8
The periodic table is arranged in a way that elements with similar properties are placed in the same group. What is the name of this property?
A. Atomic number
B. Mass number
C. Electronegativity
Correct D. Valency

Correct Answer: D

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Question 9
The diagram below shows a titration setup. What is the purpose of the burette?
Correct A. To measure the volume of the solution
B. To measure the concentration of the solution
C. To measure the pH of the solution
D. To measure the temperature of the solution

Correct Answer: A

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Question 10
The reaction of sodium with water is highly exothermic. What is the balanced chemical equation for this reaction?
Correct A. \( 2Na + 2H_2O \rightarrow 2NaOH + H_2 \)
B. \( 2Na + 2H_2O \rightarrow 2NaOH + O_2 \)
C. \( 2Na + 2H_2O \rightarrow 2NaOH + H_2O_2 \)
D. \( 2Na + 2H_2O \rightarrow 2NaOH + H_2O \)

Correct Answer: A

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Question 11
Determine the molar mass of a polymer with the following structure: [-CH2-CH2-CH2-CH2-]n. Given that the repeating unit has a mass of 28.05 g/mol, what is the molar mass of the polymer?
A. 56.1 g/mol
Correct B. 112.2 g/mol
C. 168.3 g/mol
D. 224.4 g/mol

Correct Answer: B

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Question 12
A 2.50 L sample of a gas at 25°C and 1.00 atm is compressed to 0.500 L at the same temperature. What is the new pressure of the gas?
A. 2.00 atm
B. 4.00 atm
C. 6.00 atm
Correct D. 8.00 atm

Correct Answer: D

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Question 13
A solution contains 25.0 g of glu\cose (C6H12O6) dissolved in 250.0 mL of water. What is the concentration of the solution in molarity?
A. 0.100 M
B. 0.200 M
C. 0.300 M
Correct D. 0.400 M

Correct Answer: D

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Question 14
A 0.500 L sample of a 0.200 M solution of NaOH is mixed with a 0.500 L sample of a 0.100 M solution of HCl. What is the concentration of the resulting solution?
A. 0.0500 M
B. 0.100 M
Correct C. 0.150 M
D. 0.200 M

Correct Answer: C

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Question 15
A 2.00 g sample of a metal with a density of 8.00 g/cm3 is dropped into a beaker containing 100.0 mL of water. What is the volume of the metal that is submerged in the water?
A. 1.00 cm3
Correct B. 2.00 cm3
C. 3.00 cm3
D. 4.00 cm3

Correct Answer: B

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Question 16
Determine the number of unpaired electrons in the ground state of the chromium ion, Cr^\( 3+ \), u\sing the Aufbau principle and Hund's rule.
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 17
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH of the solution after the addition of 25.0 mL of NaOH.
A. 1.00
Correct B. 2.00
C. 3.00
D. 4.00

Correct Answer: B

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Question 18
The diagram below shows a titration setup. Identify the subs\tance being titrated.
Correct A. HCl
B. NaOH
C. H2SO4
D. NH3

Correct Answer: A

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Question 19
A metal M reacts with chlorine gas to form a white solid. The reaction is as follows: M + Cl2 → MCl2. Identify the metal M.
A. Na
B. Ca
Correct C. Mg
D. Al

Correct Answer: C

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Question 20
The diagram below shows a redox reaction. Identify the oxidizing agent.
A. Zn
Correct B. Cu
C. Ag
D. H2O

Correct Answer: B

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Question 21
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CaCO3(s) from the following reaction: CaO(s) + CO2(g) → CaCO3(s).
Correct A. -1206.5 kJ/mol
B. -1206.0 kJ/mol
C. -1207.0 kJ/mol
D. -1208.0 kJ/mol

Correct Answer: A

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Question 22
A 2.50 M solution of HCl is mixed with a 1.00 M solution of NaOH. What is the concentration of the resulting solution?
A. 1.25 M
Correct B. 1.50 M
C. 2.00 M
D. 2.50 M

Correct Answer: B

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Question 23
A 5.00 g sample of a metal is dissolved in 50.0 mL of 0.100 M HCl. What is the concentration of the resulting solution?
A. 0.100 M
B. 0.200 M
Correct C. 0.300 M
D. 0.400 M

Correct Answer: C

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Question 24
A 2.00 M solution of NaOH is mixed with a 1.00 M solution of HCl. What is the concentration of the resulting solution?
A. 1.00 M
B. 1.50 M
Correct C. 2.00 M
D. 2.50 M

Correct Answer: C

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Question 25
A 5.00 g sample of a metal is dissolved in 50.0 mL of 0.100 M HCl. What is the concentration of the resulting solution?
A. 0.100 M
B. 0.200 M
Correct C. 0.300 M
D. 0.400 M

Correct Answer: C

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