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POST UTME RHEMA UNIVERSITY 2020 Chemistry | Objective

Are you preparing for POST UTME RHEMA UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2020 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1

Determine the molar mass of a polymer with the following composition: 60% polyethylene (C2H4), 20% polypropylene (C3H6), and 20% polystyrene (C8H8).

A. 60 g/mol

B. 120 g/mol

Correct C. 180 g/mol

D. 240 g/mol

Correct Answer: C

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Question 2

A 10.0 L \tank contains 5.0 g of CO2 at 25°C. If 2.0 L of gas is removed, what is the new partial pressure of CO2?

A. 0.50 atm

Correct B. 0.75 atm

C. 1.0 atm

D. 1.25 atm

Correct Answer: B

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Question 3

A 2.0 M solution of HCl is titrated with 1.0 M NaOH. What is the pH of the solution after 25 mL of NaOH has been added?

A. 1.0

Correct B. 2.0

C. 3.0

D. 4.0

Correct Answer: B

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Question 4

A 50.0 g sample of a polymer is dissolved in 100.0 mL of solvent. If the polymer has a molar mass of 100,000 g/mol, what is the concentration of the solution in g/L?

A. 0.50 g/L

Correct B. 1.0 g/L

C. 2.0 g/L

D. 5.0 g/L

Correct Answer: B

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Question 5

A 1.0 L \tank contains 2.0 g of O2 at 25°C. If the \tank is heated to 50°C, what is the new partial pressure of O2?

A. 1.0 atm

B. 1.5 atm

Correct C. 2.0 atm

D. 2.5 atm

Correct Answer: C

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Question 6

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?

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 7

The reaction between H2 and O2 produces 1.2 L of steam at 100°C and 1 atm. What is the volume of O2 consumed?

A. 0.6 L

Correct B. 1.2 L

C. 2.4 L

D. 4.8 L

Correct Answer: B

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Question 8

A 2 M solution of HCl is prepared by dissolving 40 g of HCl in 100 mL of water. What is the concentration of H+ ions in the solution?

A. 1 M

Correct B. 2 M

C. 4 M

D. 8 M

Correct Answer: B

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Question 9

A 1 M solution of NaOH is prepared by dissolving 40 g of NaOH in 100 mL of water. What is the concentration of OH- ions in the solution?

A. 0.5 M

Correct B. 1 M

C. 2 M

D. 4 M

Correct Answer: B

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Question 10

A 0.1 M solution of H2SO4 is prepared by dissolving 10 g of H2SO4 in 100 mL of water. What is the concentration of H+ ions 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

The atomic radius of an element is 100 pm. If the element is in its ground state, what is the expected value of its atomic radius in its first excited state?

A. 90 pm

B. 110 pm

Correct C. 120 pm

D. 130 pm

Correct Answer: C

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Question 12

A 2.5 M solution of HCl is titrated with 0.5 M NaOH. If 25 mL of NaOH is added, what is the pH of the resulting solution?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 13

A gas at 300 K has a pressure of 100 kPa. If the temperature is increased to 400 K, what is the new pressure?

A. 120 kPa

Correct B. 140 kPa

C. 160 kPa

D. 180 kPa

Correct Answer: B

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Question 14

A solution contains 0.1 M HCl and 0.2 M NaOH. What is the pH of the resulting solution?

Correct A. 1

B. 2

C. 3

D. 4

Correct Answer: A

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Question 15

A gas at 200 K has a volume of 2 L. If the temperature is increased to 300 K, what is the new volume?

A. 3 L

Correct B. 4 L

C. 5 L

D. 6 L

Correct Answer: B

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Question 16

A 0.1 M solution of a weak acid HA is titrated with 0.1 M NaOH. If 20 mL of NaOH is required to reach the equivalence point, what is the initial concentration of HA?

Correct A. 0.05 M

B. 0.1 M

C. 0.2 M

D. 0.5 M

Correct Answer: A

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Question 17

A gas at 25°C and 1 atm is compressed to 4 atm. If the initial volume is 2 L, what is the final volume?

A. 1 L

B. 2 L

Correct C. 4 L

D. 8 L

Correct Answer: C

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Question 18

A 2% w/v solution of glu\cose is prepared by dissolving 2 g of glu\cose in 100 mL of water. What is the molarity of the solution?

A. 0.2 M

Correct B. 0.4 M

C. 0.6 M

D. 0.8 M

Correct Answer: B

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Question 19

A metal (M) reacts with hydrochloric acid (HCl) to produce hydrogen gas and a salt. If 2.5 g of M reacts with 10 mL of 2 M HCl, what is the molar mass of M?

A. 50 g/mol

B. 100 g/mol

Correct C. 150 g/mol

D. 200 g/mol

Correct Answer: C

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Question 20

A 1 M solution of NaOH is titrated with a 1 M solution of HCl. If 20 mL of HCl is required to reach the equivalence point, what is the pH of the solution?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 21

Determine the s\tandard Gibbs free energy change for the reaction: 2Ag+(aq) + 2Cl-(aq) → 2AgCl(s) at 298 K and 1 atm. Given: ΔH° = -127.0 kJ/mol, ΔS° = 143 J/mol·K.

A. -130.0 kJ/mol

Correct B. -127.0 kJ/mol

C. -124.0 kJ/mol

D. -121.0 kJ/mol

Correct Answer: B

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Question 22

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

A. 1.00

Correct B. 2.00

C. 3.00

D. 4.00

Correct Answer: B

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Question 23

A sample of a polymer has a molecular weight of 50,000 g/mol. If the degree of polymerization is 200, what is the molar mass of the repeating unit?

A. 250 g/mol

Correct B. 250.5 g/mol

C. 251 g/mol

D. 252 g/mol

Correct Answer: B

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Question 24

A 1.00 L solution of 0.100 M HCl is mixed with 1.00 L of 0.100 M NaOH. What is the pH of the resulting solution?

A. 1.00

Correct B. 2.00

C. 3.00

D. 4.00

Correct Answer: B

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Question 25

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

A. 1.00

Correct B. 2.00

C. 3.00

D. 4.00

Correct Answer: B

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