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POST UTME LAUTECH 2022 Chemistry | Objective

Are you preparing for POST UTME LAUTECH exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2022 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1

A sample of an ideal gas at 25°C and 1 atm is heated to 50°C at cons\tant volume. What is the final pressure of the gas in atm?

A. 1.5 atm

Correct B. 2 atm

C. 3 atm

D. 4 atm

Correct Answer: B

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Question 2

The reaction between nitrogen dioxide and ozone is as follows: 2NO2(g) + O3(g) → 2NO3(g) + O2(g). What is the rate law for this reaction?

A. rate = k[NO2][O3]

Correct B. rate = k[NO2]^2[O3]

C. rate = k[NO2][O3]^2

D. rate = k[NO2]^2[O3]^2

Correct Answer: B

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Question 3

A 2.5 g sample of sulfur is burned in oxygen to form sulfur dioxide. If the reaction is complete, what is the volume of sulfur dioxide produced at STP?

A. 1.2 L

Correct B. 2.4 L

C. 3.6 L

D. 4.8 L

Correct Answer: B

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Question 4

A solution of 0.1 M NaCl is prepared by dissolving 6.0 g of NaCl in 100 mL of water. What is the concentration of the solution in g/L?

A. 0.6 g/L

Correct B. 1.2 g/L

C. 1.8 g/L

D. 2.4 g/L

Correct Answer: B

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Question 5

A 2.0 L sample of a gas at 25°C and 1 atm is compressed to 0.5 L at 50°C. What is the final pressure of the gas in atm?

A. 2 atm

Correct B. 4 atm

C. 6 atm

D. 8 atm

Correct Answer: B

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Question 6

Determine the molar solubility of AgCl in a 0.1 M NaCl solution, given that the solubility product cons\tant (Ksp) of AgCl is 1.8 × 10^-10.

A. 1.0 × 10^-5 M

Correct B. 1.5 × 10^-5 M

C. 2.0 × 10^-5 M

D. 3.0 × 10^-5 M

Correct Answer: B

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Question 7

A 0.1 M solution of glu\cose (C6H12O6) is prepared by dissolving 2.0 g of glu\cose in 100 mL of water. What is the concentration of glu\cose in the solution in units of mol/L?

A. 0.02 M

Correct B. 0.04 M

C. 0.06 M

D. 0.08 M

Correct Answer: B

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Question 8

A 2.0 M solution of HCl is prepared by dissolving 40 g of HCl in 100 mL of water. What is the concentration of HCl in the solution in units of mol/L?

A. 1.0 M

Correct B. 2.0 M

C. 3.0 M

D. 4.0 M

Correct Answer: B

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Question 9

A 0.1 M solution of NaOH is prepared by dissolving 2.0 g of NaOH in 100 mL of water. What is the concentration of NaOH in the solution in units of mol/L?

A. 0.02 M

Correct B. 0.04 M

C. 0.06 M

D. 0.08 M

Correct Answer: B

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Question 10

A 2.0 M solution of H2SO4 is prepared by dissolving 40 g of H2SO4 in 100 mL of water. What is the concentration of H2SO4 in the solution in units of mol/L?

A. 1.0 M

Correct B. 2.0 M

C. 3.0 M

D. 4.0 M

Correct Answer: B

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Question 11

The rate cons\tant of a reaction is given by the equation: k = Ae^\( -Ea/RT \). If the rate cons\tant at 25°C is 0.05 s^\( -1 \) and at 50°C is 0.15 s^\( -1 \), calculate the activation energy (Ea) of the reaction in kJ/mol.

A. 20 kJ/mol

Correct B. 30 kJ/mol

C. 40 kJ/mol

D. 50 kJ/mol

Correct Answer: B

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Question 12

A 0.1 M solution of a weak acid HA is mixed with 0.1 M NaOH. If the initial pH of the acid is 3, calculate the pH after 10 minutes.

A. 4

B. 5

Correct C. 6

D. 7

Correct Answer: C

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Question 13

A metal (M) reacts with oxygen to form a basic oxide. The reaction is: 4M + 3O2 → 2MO3. If 2.5 g of M reacts with 3.5 g of O2, calculate the percentage yield of MO3.

A. 80%

B. 90%

Correct C. 95%

D. 98%

Correct Answer: C

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Question 14

The half-life of a radioactive subs\tance is 5 years. If the initial activity is 1000 Bq, calculate the activity after 10 years.

A. 125 Bq

Correct B. 250 Bq

C. 500 Bq

D. 1000 Bq

Correct Answer: B

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Question 15

A solution of 0.1 M HCl is titrated with 0.1 M NaOH. If 20 mL of HCl is required to reach the equivalence point, calculate the volume of NaOH required to reach the equivalence point.

A. 20 mL

Correct B. 30 mL

C. 40 mL

D. 50 mL

Correct Answer: B

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Question 16

The reaction of cyclohexane with bromine in the presence of light produces 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 17

A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. What is 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 compound with the molecular formula C4H10 is a branched alkane. Draw the structure of this compound.

A. CH3CH2CH2CH3

Correct B. CH3CH2CH(CH3)2

C. CH3CH(CH3)CH2CH3

D. CH3C(CH3)2CH2CH3

Correct Answer: B

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Question 19

The reaction of ammonia with oxygen produces nitrogen monoxide and water. What is the balanced equation for this reaction?

A. 4NH3 + 5O2 → 4NO + 6H2O

Correct B. 2NH3 + 3O2 → 2NO + 3H2O

C. NH3 + O2 → NO + H2O

D. 2NH3 + O2 → 2NO + 2H2O

Correct Answer: B

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Question 20

A 10.0 g sample of a non-metallic oxide is heated in a crucible. The mass of the oxide decreases by 2.50 g. What is the percentage decrease in mass?

A. 12.5%

Correct B. 25.0%

C. 37.5%

D. 50.0%

Correct Answer: B

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