POST UTME ESUT 2018 Chemistry | Objective

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Question 1
Determine the pH of a 0.1 M solution of HCl in water at 25°C, given that the dissociation cons\tant of HCl is 10^\( -7 \) and the ion product of water is 10^\( -14 \).
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 2
A 0.5 M solution of NaOH is mixed with a 0.5 M solution of HCl. What is the resulting pH after the reaction is complete?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 3
A polymer has a molecular weight of 50000 g/mol and a degree of polymerization of 200. What is the molar mass of the repeating unit?
A. 250
Correct B. 500
C. 750
D. 1000

Correct Answer: B

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Question 4
A solution of 0.1 M HCl is mixed with a solution of 0.1 M NaOH. What is the resulting pH after the reaction is complete?
Correct A. 1
B. 2
C. 3
D. 4

Correct Answer: A

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Question 5
A 0.5 M solution of HCl is mixed with a 0.5 M solution of NaOH. What is the resulting pH after the reaction is complete?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 6
The reaction of cyclohexane with bromine in the presence of light yields a mixture of 1,2-dibromocyclohexane and 1,4-dibromocyclohexane. What is the major product of this reaction?
A. 1,2-dibromocyclohexane
Correct B. 1,4-dibromocyclohexane
C. cis-1,2-dibromocyclohexane
D. trans-1,4-dibromocyclohexane

Correct Answer: B

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Question 7
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of H2O(l) if the s\tandard enthalpy of formation of H2(g) is 0 kJ/mol and the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol?
Correct A. -285.8 kJ/mol
B. -241.8 kJ/mol
C. -393.5 kJ/mol
D. -572.8 kJ/mol

Correct Answer: A

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Question 8
The reaction of 2-propanol with HCl yields 2-chloropropane and H2O. What is the major product of this reaction?
Correct A. 2-chloropropane
B. 2-propanol
C. HCl
D. H2O

Correct Answer: A

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Question 9
The s\tandard enthalpy of formation of NH3(g) is -45.9 kJ/mol. What is the s\tandard enthalpy of formation of N2(g) if the s\tandard enthalpy of formation of H2(g) is 0 kJ/mol?
A. -45.9 kJ/mol
Correct B. -92.0 kJ/mol
C. 0 kJ/mol
D. 45.9 kJ/mol

Correct Answer: B

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Question 10
The reaction of 2-methyl-2-butene with HBr yields 2-bromo-2-methylbu\tane. What is the major product of this reaction?
Correct A. 2-bromo-2-methylbu\tane
B. 2-methyl-2-butene
C. HBr
D. H2O

Correct Answer: A

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Question 11
A 0.1 M solution of NaCl is prepared by dissolving 2.5 g of NaCl in 100 mL of water. What is the concentration of Na+ ions in the solution?
Correct A. 0.043 M
B. 0.0435 M
C. 0.044 M
D. 0.045 M

Correct Answer: A

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Question 12
A 2.5 g sample of an organic compound is dissolved in 25 mL of ethanol. The solution is then titrated with 0.1 M NaOH. If 25 mL of NaOH is required to reach the equivalence point, what is the molar mass of the organic compound?
A. 60 g/mol
B. 62 g/mol
Correct C. 64 g/mol
D. 66 g/mol

Correct Answer: C

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Question 13
A 100 mL sample of a solution containing 0.1 M NaCl is electrolyzed u\sing a platinum electrode. If the current is 2 A and the time is 10 minutes, what is the mass of Cl2 gas produced?
A. 0.1 g
Correct B. 0.2 g
C. 0.3 g
D. 0.4 g

Correct Answer: B

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Question 14
A 2.5 g sample of an organic compound is burned in a bomb calorimeter. If the heat of combustion is 1000 J/g, what is the energy released per mole of the compound?
Correct A. 2500 J/mol
B. 3000 J/mol
C. 3500 J/mol
D. 4000 J/mol

Correct Answer: A

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Question 15
A 100 mL sample of a solution containing 0.1 M NaOH is titrated with 0.1 M HCl. If 50 mL of HCl is required to reach the equivalence point, what is the concentration of NaOH in the solution?
A. 0.05 M
Correct B. 0.05 M
C. 0.06 M
D. 0.07 M

Correct Answer: B

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Question 16
Determine the structure of the compound C4H9Cl, given that it is a secondary alkyl halide.
A. \( \text{CH}_3\text{CH}_2\text{CH}_2\text{CH}_2\text{Cl} \)
Correct B. \( \text{CH}_3\text{CH}_2\text{CH}\( \text{Cl})\text{CH}_3 \ \)
C. \( \text{CH}_3\text{CH}\( \text{Cl})\text{CH}_2\text{CH}_3 \ \)
D. \( \text{CH}_3\text{CH}_2\text{CH}_2\text{CH}_2\text{CH}_2\text{Cl} \)

Correct Answer: B

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Question 17
A 0.5 M solution of NaOH is mixed with a 0.2 M solution of HCl. What is the concentration of the resulting solution?
A. 0.3 M
B. 0.5 M
Correct C. 0.7 M
D. 1.0 M

Correct Answer: C

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Question 18
A metal oxide, M2O3, has a molar mass of 228 g/mol. What is the identity of the metal?
Correct A. Al
B. Cr
C. Mn
D. Fe

Correct Answer: A

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Question 19
A solution of 0.1 M NaCl is mixed with a solution of 0.2 M Na2SO4. What is the concentration of the resulting solution?
A. 0.1 M
B. 0.2 M
Correct C. 0.3 M
D. 0.4 M

Correct Answer: C

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Question 20
A polymer, P, has a molecular weight of 100,000 g/mol. If 1 g of P is dissolved in 100 mL of water, what is the concentration of the solution?
A. 0.1 M
B. 0.2 M
Correct C. 0.5 M
D. 1.0 M

Correct Answer: C

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Question 21
Determine the solubility of $\text{CaCO}_3$ in $\text{H}_2\text{O}$ at $25^\circ\text{C}$, given that $K_{sp} = 8.9 \times 10^{-9}$.
A. $1.2 \times 10^{-8} \text{M}$
Correct B. $2.5 \times 10^{-8} \text{M}$
C. $5.0 \times 10^{-8} \text{M}$
D. $1.0 \times 10^{-7} \text{M}$

Correct Answer: B

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Question 22
A sample of $\text{N}_2$ gas at $25^\circ\text{C}$ and $1.0 \text{atm}$ is collected over water at $25^\circ\text{C}$. If the partial pressure of $\text{H}_2\text{O}$ is $0.031 \text{atm}$, what is the total pressure of the gas mixture?
A. $1.0 \text{atm}$
Correct B. $1.03 \text{atm}$
C. $1.05 \text{atm}$
D. $1.07 \text{atm}$

Correct Answer: B

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Question 23
A solution containing $0.10 \text{M}$ $\text{Na}_2\text{SO}_4$ is mixed with a solution containing $0.20 \text{M}$ $\text{BaCl}_2$. What is the concentration of $\text{BaSO}_4$ that precipitates out of solution?
A. $0.05 \text{M}$
Correct B. $0.10 \text{M}$
C. $0.15 \text{M}$
D. $0.20 \text{M}$

Correct Answer: B

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Question 24
A $0.50 \text{M}$ solution of $\text{NaOH}$ is mixed with a $0.50 \text{M}$ solution of $\text{HCl}$. What is the pH of the resulting solution?
A. $1.0$
Correct B. $2.0$
C. $3.0$
D. $4.0$

Correct Answer: B

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Question 25
A $0.50 \text{M}$ solution of $\text{HCl}$ is mixed with a $0.50 \text{M}$ solution of $\text{NaOH}$. What is the pH of the resulting solution?
A. $1.0$
Correct B. $2.0$
C. $3.0$
D. $4.0$

Correct Answer: B

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