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POST UTME FUTA 2019 Chemistry | Objective

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Question 1

Determine the number of moles of CO2 produced from the complete combustion of 2.5 g of propane (C3H8) according to the equation: C3H8 + 5O2 → 3CO2 + 4H2O.

A. 0.25 mol

Correct B. 0.5 mol

C. 0.75 mol

D. 1.0 mol

Correct Answer: B

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Question 2

A 10 mL sample of a solution containing 0.1 M NaCl is diluted to 50 mL. What is the concentration of the resulting solution?

A. 0.002 M

Correct B. 0.01 M

C. 0.02 M

D. 0.1 M

Correct Answer: B

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Question 3

The diagram below shows a titration setup. Identify the part labeled A.

Correct A. Burette

B. Beaker

C. Erlenmeyer Flask

D. Conical Flask

Correct Answer: A

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Question 4

A metal oxide, M2O3, has a molar mass of 224 g/mol. If 2.5 g of the oxide is dissolved in water, what is the concentration of the resulting solution?

A. 0.01 M

B. 0.02 M

Correct C. 0.05 M

D. 0.1 M

Correct Answer: C

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Question 5

The diagram below shows a chemical apparatus setup. Identify the part labeled B.

A. Test Tube

Correct B. Burette

C. Erlenmeyer Flask

D. Conical Flask

Correct Answer: B

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Question 6

The reaction of cyclohexane with bromine in the presence of light produces a mixture of cyclohexyl bromide and a dibromocyclohexane. The major product is the one that is formed by the attack of bromine at the most substituted carbon atom. What is the major product of this reaction?

A. 1-bromocyclohexane

B. trans-1,2-dibromocyclohexane

Correct C. cis-1,2-dibromocyclohexane

D. trans-1,4-dibromocyclohexane

Correct Answer: C

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Question 7

The reaction of sodium nitrite with acetic acid in the presence of sulfuric acid produces a mixture of nitrous acid and acetic anhydride. What is the major product of this reaction?

A. nitrous acid

Correct B. acetic anhydride

C. nitric acid

D. nitrogen gas

Correct Answer: B

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Question 8

The reaction of phenol with sodium hydroxide in the presence of heat produces a mixture of sodium phenoxide and water. What is the major product of this reaction?

Correct A. sodium phenoxide

B. water

C. phenol

D. sodium hydroxide

Correct Answer: A

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Question 9

The reaction of sulfur dioxide with sodium hydroxide in the presence of heat produces a mixture of sodium sulfite and water. What is the major product of this reaction?

Correct A. sodium sulfite

B. water

C. sulfur dioxide

D. sodium hydroxide

Correct Answer: A

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Question 10

The reaction of carbon monoxide with hydrogen in the presence of a catalyst produces a mixture of methanol and water. What is the major product of this reaction?

Correct A. methanol

B. water

C. carbon monoxide

D. hydrogen

Correct Answer: A

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Question 11

Calculate the s\tandard enthalpy of formation of CO2(g) from the following data: ΔH°f(CO2(g)) = -393.5 kJ/mol, ΔH°f(C) = 0 kJ/mol, ΔH°f(O2(g)) = 0 kJ/mol.

Correct A. -393.5 kJ/mol

B. -393.5 kJ/mol + 0 kJ/mol

C. -393.5 kJ/mol + 0.5 kJ/mol

D. -393.5 kJ/mol + 0.5 kJ/mol + 0 kJ/mol

Correct Answer: A

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Question 12

What is the major product of the reaction between 2-methylpropane and chlorine?

A. 2-chloro-2-methylpropane

Correct B. 2,2-dichloro-2-methylpropane

C. 2-chloro-2-methyl-1-propane

D. 2-chloro-2-methyl-2-propane

Correct Answer: B

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Question 13

A 0.500 M solution of HCl is mixed with a 0.500 M solution of NaOH. What is the concentration of the resulting solution?

A. 0.500 M

Correct B. 1.000 M

C. 0.250 M

D. 0.750 M

Correct Answer: B

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Question 14

What is the pH of a 0.100 M solution of HCl?

Correct A. 1.00

B. 2.00

C. 3.00

D. 4.00

Correct Answer: A

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Question 15

What is the major product of the reaction between ethene and HCl?

Correct A. 1-chloroethane

B. 2-chloroethane

C. 1,2-dichloroethane

D. 1,1-dichloroethane

Correct Answer: A

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Question 16

Determine the rate cons\tant (k) for the reaction: 2NO(g) + O2(g) → 2NO2(g), given that the initial concentrations of NO and O2 are 0.1 M and 0.2 M, respectively, and the rate of reaction is 0.05 M/s after 10 minutes.

A. \( k = \frac{2.303}{t} \log \frac{[NO]_0 [O_2]_0}{[NO_2]_t} \)

B. \( k = \frac{2.303}{t} \log \frac{[NO_2]_t}{[NO]_0 [O_2]_0} \)

Correct C. \( k = \frac{2.303}{t} \log \frac{[NO]_0 [O_2]_0}{[NO_2]_t} \)

D. \( k = \frac{2.303}{t} \log \frac{[NO_2]_t}{[NO]_0 [O_2]_0} \)

Correct Answer: C

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Question 17

A 0.1 M solution of NaOH is mixed with a 0.1 M solution of HCl. What is the pH of the resulting solution?

Correct A. 7

B. 8

C. 9

D. 10

Correct Answer: A

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Question 18

The half-life of a radioactive subs\tance is 10 years. If the initial activity is 1000 Bq, what is the activity after 20 years?

A. 500 Bq

Correct B. 750 Bq

C. 1000 Bq

D. 1250 Bq

Correct Answer: B

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Question 19

A 1.0 M solution of H2SO4 is mixed with a 1.0 M solution of NaOH. What is the resulting pH?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 20

A 0.1 M solution of HCl is mixed with a 0.1 M solution of NaOH. What is the resulting pH?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 21

Determine the pH of a 0.1 M solution of HCN (hydrocyanic acid) at 25°C, given that the dissociation cons\tant \( K_a \) of HCN is 6.2 × 10^-10.

Correct A. 3.5

B. 4.5

C. 5.5

D. 6.5

Correct Answer: A

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Question 22

A metal (M) reacts with chlorine gas to form a white solid. The reaction is as follows: M + Cl_2 → MCl_2. If 2.5 g of M reacts with 1.5 g of Cl_2, what is the percentage yield of MCl_2 if the theoretical yield is 4.2 g?

A. 60%

B. 70%

Correct C. 80%

D. 90%

Correct Answer: C

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Question 23

A solution of sodium thiosulfate \( Na_2S_2O_3 \) is titrated with a solution of iodine \( I_2 \). The reaction is as follows: I_2 + 2Na_2S_2O_3 → 2NaI + Na_2S_4O_6. If 25 mL of 0.1 M I_2 is titrated with 20 mL of 0.2 M Na_2S_2O_3, what is the concentration of the iodine solution?

A. 0.05 M

B. 0.1 M

Correct C. 0.15 M

D. 0.2 M

Correct Answer: C

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Question 24

A sample of a polymer (P) has a molecular weight of 10^5 g/mol. If the polymer is composed of 80% monomer A and 20% monomer B, what is the average molecular weight of the polymer?

A. 8 × 10^4 g/mol

B. 1 × 10^5 g/mol

Correct C. 1.2 × 10^5 g/mol

D. 1.5 × 10^5 g/mol

Correct Answer: C

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Question 25

A solution of sodium hydroxide (NaOH) is titrated with a solution of hydrochloric acid (HCl). The reaction is as follows: NaOH + HCl → NaCl + H_2O. If 25 mL of 0.1 M NaOH is titrated with 20 mL of 0.2 M HCl, what is the concentration of the hydrochloric acid solution?

A. 0.05 M

B. 0.1 M

Correct C. 0.15 M

D. 0.2 M

Correct Answer: C

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