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POST UTME GREENFIELD UNIVERSITY 2022 Chemistry | Objective

Are you preparing for POST UTME GREENFIELD UNIVERSITY 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 polymer is formed by the condensation reaction between two monomers, A and B. If the molecular weight of the polymer is 10,000 g/mol, and the molecular weights of the monomers are 500 g/mol and 200 g/mol, respectively, what is the degree of polymerization (DP) of the polymer?

A. 10

Correct B. 20

C. 30

D. 40

Correct Answer: B

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Question 2

A 2.0 g sample of a metal oxide is heated in a crucible until it decomposes completely. If the mass of the metal obtained is 0.8 g, and the molar mass of the metal is 40 g/mol, what is the molar mass of the metal oxide?

A. 80 g/mol

Correct B. 120 g/mol

C. 160 g/mol

D. 200 g/mol

Correct Answer: B

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Question 3

A solution of 0.1 M NaOH is mixed with a solution of 0.1 M 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 4

A 1.0 L sample of a gas at 25°C and 1 atm is compressed to 2 atm. What is the new volume of the gas?

A. 1.0 L

Correct B. 2.0 L

C. 3.0 L

D. 4.0 L

Correct Answer: B

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Question 5

A 2.0 g sample of a metal is heated in a crucible until it decomposes completely. If the mass of the metal oxide obtained is 2.8 g, and the molar mass of the metal is 40 g/mol, what is the molar mass of the metal oxide?

A. 80 g/mol

Correct B. 120 g/mol

C. 160 g/mol

D. 200 g/mol

Correct Answer: B

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Question 6

A researcher is studying the degradation of polyethylene terephthalate (PET) in the presence of UV radiation. The reaction is first-order with respect to the concentration of PET. If the initial concentration of PET is 1.0 M and the half-life of the reaction is 100 hours, calculate the concentration of PET after 300 hours.

Correct A. 0.125 M

B. 0.25 M

C. 0.5 M

D. 1.0 M

Correct Answer: A

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Question 7

A solution of 0.1 M HCl is titrated with 0.1 M NaOH. If 20 mL of NaOH is added, what is the pH of the solution?

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 8

A sample of water contains 10 ppm of dissolved oxygen. If the sample is collected in a 100 mL bottle, what is the mass of oxygen in the sample?

Correct A. 0.01 g

B. 0.1 g

C. 1.0 g

D. 10 g

Correct Answer: A

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Question 9

A mixture of 2.0 g of glu\cose (C6H12O6) and 3.0 g of fructose (C6H12O6) is dissolved in 100 mL of water. What is the molarity 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 10

A solution of 0.1 M HCl is titrated with 0.1 M NaOH. If 20 mL of NaOH is added, what is the concentration of HCl remaining in the solution?

A. 0.05 M

Correct B. 0.1 M

C. 0.2 M

D. 0.5 M

Correct Answer: B

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Question 11

Determine the s\tandard potential of the cell represented by the following reaction: Zn(s) + 2Ag+(aq) → Zn2+(aq) + 2Ag(s). Given that the s\tandard potential of Zn2+/Zn is -0.76 V and the s\tandard potential of Ag+/Ag is 0.80 V.

Correct A. -0.04 V

B. 0.04 V

C. 0.80 V

D. -0.76 V

Correct Answer: A

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Question 12

A sample of nitrogen gas at 25°C and 1 atm is allowed to expand to 3 atm. What is the final temperature of the gas in Kelvin?

A. 298 K

Correct B. 300 K

C. 302 K

D. 304 K

Correct Answer: B

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Question 13

A 2.5-g sample of sulfur is burned in oxygen to produce sulfur dioxide. If the reaction is 100% efficient, what is the volume of sulfur dioxide produced at STP?

A. 1.2 L

Correct B. 1.5 L

C. 2.0 L

D. 2.5 L

Correct Answer: B

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Question 14

A solution of 0.1 M sodium chloride is electrolyzed u\sing a platinum electrode. If the current is 1.5 A, what is the mass of chlorine gas produced at the anode in 2 hours?

A. 0.15 g

B. 0.20 g

Correct C. 0.25 g

D. 0.30 g

Correct Answer: C

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Question 15

A 10-mL sample of a polymer solution is dried to a cons\tant weight. If the weight of the dried sample is 1.2 g, what is the concentration of the polymer in the original solution?

A. 0.12 g/mL

Correct B. 0.15 g/mL

C. 0.18 g/mL

D. 0.20 g/mL

Correct Answer: B

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Question 16

Determine the s\tandard enthalpy of formation of NH3(g) u\sing the following data: ΔHf(NH3(g)) = -46.1 kJ/mol, ΔHf(H2(g)) = 0 kJ/mol, ΔHf(N2(g)) = 0 kJ/mol.

A. -46.1 kJ/mol

B. -92.2 kJ/mol

Correct C. -46.1 kJ/mol + 92.2 kJ/mol

D. -92.2 kJ/mol - 46.1 kJ/mol

Correct Answer: C

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Question 17

A 0.1 M solution of NaOH is titrated with a 0.1 M solution of HCl. What is the pH of the solution after 25 mL of HCl has been added?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 18

A diagram of a redox reaction is shown below:\n\n[Insert diagram of redox reaction]\n\nWhat is the oxidation state of the sulfur atom in the compound SO42-?

A. +2

B. +4

Correct C. +6

D. +8

Correct Answer: C

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Question 19

A 0.1 M solution of H2SO4 is titrated with a 0.1 M solution of NaOH. What is the pH of the solution after 25 mL of NaOH has been added?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 20

A diagram of a solubility curve is shown below:\n\n[Insert diagram of solubility curve]\n\nWhat is the solubility of NaCl at 25°C?

A. 10 g/100 mL

Correct B. 20 g/100 mL

C. 30 g/100 mL

D. 40 g/100 mL

Correct Answer: B

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Question 21

The rate cons\tant (k) for a first-order reaction is given by the equation: k = 2.303/t \log10\( A0/A \). If the initial concentration (A0) is 0.1 M and the concentration after time (t) is 0.05 M, calculate the rate cons\tant (k) in s^-1.

A. 0.01 s^-1

Correct B. 0.02 s^-1

C. 0.03 s^-1

D. 0.04 s^-1

Correct Answer: B

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Question 22

A 2.5 L flask contains 0.2 mol of an ideal gas at 27°C. Calculate the pressure (P) of the gas in atm.

A. 1.5 atm

B. 2.0 atm

Correct C. 2.5 atm

D. 3.0 atm

Correct Answer: C

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Question 23

The pH of a solution is given by the equation: pH = -\log[H+]. If the concentration of hydrogen ions is 1.0 x 10^-5 M, calculate the pH of the solution.

A. 4.0

Correct B. 5.0

C. 6.0

D. 7.0

Correct Answer: B

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Question 24

A 0.1 M solution of sodium hydroxide (NaOH) is titrated with 0.1 M hydrochloric acid (HCl). Calculate the pH of the solution after 25 mL of HCl has been added.

A. 2.0

B. 3.0

Correct C. 4.0

D. 5.0

Correct Answer: C

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Question 25

A 2.0 L flask contains 0.5 mol of an ideal gas at 37°C. Calculate the number of moles (n) of the gas.

A. 0.2 mol

B. 0.3 mol

C. 0.4 mol

Correct D. 0.5 mol

Correct Answer: D

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