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POST UTME CHRISTOPHER UNIVERSITY 2023 Chemistry | Objective

Are you preparing for POST UTME CHRISTOPHER UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2023 Chemistry (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1

Determine the value of $x$ in the equation $2x + 5 = 11$.

Correct A. 3

B. 4

C. 5

D. 6

Correct Answer: A

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Question 2

A sample of $CO_2$ gas occupies a volume of $2.5 , L$ at a pressure of $1.5 \times 10^5 , Pa$. What is the temperature of the gas in Kelvin?

A. 300 K

B. 400 K

Correct C. 500 K

D. 600 K

Correct Answer: C

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Question 3

The diagram below shows a titration setup.

A. The burette contains the acid.

B. The beaker contains the acid.

C. The burette contains the base.

Correct D. The beaker contains the base.

Correct Answer: D

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Question 4

A solution contains $0.5 , M$ $NaCl$ and $0.2 , M$ $CaCl_2$. What is the total concentration of ions in the solution?

A. 0.7 M

B. 0.8 M

C. 0.9 M

Correct D. 1.0 M

Correct Answer: D

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Question 5

The diagram below shows a graph of $pH$ versus $[H^+]$.

A. The $pH$ increases as $[H^+]$ increases.

Correct B. The $pH$ decreases as $[H^+]$ increases.

C. The $pH$ remains cons\tant as $[H^+]$ increases.

D. The $pH$ decreases as $[H^+]$ decreases.

Correct Answer: B

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Question 6

A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. The pH of the solution after the addition of 25.0 mL of NaOH is 8.50. What is the concentration of the NaOH solution?

A. 0.100 M

B. 0.0500 M

Correct C. 0.0250 M

D. 0.0125 M

Correct Answer: C

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Question 7

A solution of K2Cr2O7 is reduced by SnCl2 in acidic medium to form a green precipitate. What is the name of the green precipitate?

A. Cr(OH)3

B. Cr(OH)2

C. Cr(OH)4-

Correct D. Cr(OH)3·Sn(OH)2

Correct Answer: D

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Question 8

The s\tandard electrode potential of the cell is 0.80 V. If the cell is connected to a 12.0 V power source, what is the cell potential?

A. 0.80 V

Correct B. 1.20 V

C. 1.60 V

D. 2.00 V

Correct Answer: B

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Question 9

A sample of a hydrocarbon has a molecular formula of C6H14. What is the type of hydrocarbon?

Correct A. Alkane

B. Alkene

C. Alkyne

D. Aromatic hydrocarbon

Correct Answer: A

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Question 10

A solution of NaOH is added to a solution of HCl. What is the resulting solution?

A. NaCl(aq)

B. NaOH(aq)

C. HCl(aq)

Correct D. NaCl(aq) + NaOH(aq)

Correct Answer: D

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Question 11

A solution of $CuSO_4$ is electrolyzed u\sing a platinum electrode. The electrolysis is carried out in a cell with a salt bridge. If the electrolysis is continued for a long time, what will be the final product at the cathode?

Correct A. Cu

B. CuSO_4

C. H_2

D. O_2

Correct Answer: A

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Question 12

The reaction of $CH_3CH_2OH$ with $HCl$ is an example of a reaction that involves the formation of a new $C-C$ bond. What is the name of the reaction?

A. Substitution reaction

B. Elimination reaction

C. Addition reaction

Correct D. Condensation reaction

Correct Answer: D

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Question 13

A polymer is a long chain of repeating units called monomers. What is the name of the process by which a polymer is formed from its monomers?

Correct A. Polymerization

B. Depolymerization

C. Condensation reaction

D. Addition reaction

Correct Answer: A

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Question 14

A solution of $NaOH$ is electrolyzed u\sing a platinum electrode. The electrolysis is carried out in a cell with a salt bridge. If the electrolysis is continued for a long time, what will be the final product at the anode?

A. H_2O

Correct B. O_2

C. Na

D. NaOH

Correct Answer: B

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Question 15

A solution of $H_2SO_4$ is electrolyzed u\sing a platinum electrode. The electrolysis is carried out in a cell with a salt bridge. If the electrolysis is continued for a long time, what will be the final product at the cathode?

Correct A. H_2

B. O_2

C. SO_2

D. SO_3

Correct Answer: A

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Question 16

A gas at 300 K and 1 atm is compressed to 2 atm. What is the new volume of the gas, given that the initial volume is 2.5 L?

Correct A. 1.25 L

B. 2.5 L

C. 5 L

D. 10 L

Correct Answer: A

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Question 17

The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of CO(g)?

Correct A. -110.5 kJ/mol

B. -393.5 kJ/mol

C. -110.5 kJ/mol + 393.5 kJ/mol

D. 393.5 kJ/mol

Correct Answer: A

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Question 18

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

A. 1

B. 2

Correct C. 3

D. 4

Correct Answer: C

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Question 19

The atomic radius of an element is 100 pm. What is the atomic radius of its isotope with a mass number of 200?

A. 150 pm

Correct B. 200 pm

C. 250 pm

D. 300 pm

Correct Answer: B

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Question 20

A metal oxide has the formula M2O3. What is the oxidation state of the metal?

Correct A. +3

B. +5

C. +6

D. +7

Correct Answer: A

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Question 21

Calculate the s\tandard enthalpy change $ ΔH^circ $ for the reaction: 2Al(s) + Fe_2O_3(s) → 2Fe(s) + Al_2O_3(s). Given: ΔH^circ_f$ Al_2O_3\( s \ $) = -1675.7 kJ/mol, ΔH^circ_f$ Fe_2O_3\( s \ $) = -825.4 kJ/mol, ΔH^circ_f(Al(s)) = 0 kJ/mol, ΔH^circ_f(Fe(s)) = 0 kJ/mol.

Correct A. -1751.1 kJ/mol

B. -1751.9 kJ/mol

C. -1750.5 kJ/mol

D. -1752.3 kJ/mol

Correct Answer: A

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Question 22

A polymer has a molecular weight of 50,000 g/mol and a degree of polymerization of 500. What is the molar mass of the repeating unit?

A. 100 g/mol

Correct B. 50 g/mol

C. 500 g/mol

D. 1000 g/mol

Correct Answer: B

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Question 23

The pH of a 0.1 M solution of HCl is 1. What is the concentration of H^+ ions in the solution?

A. 0.1 M

B. 0.01 M

C. 0.001 M

Correct D. 0.0001 M

Correct Answer: D

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Question 24

A 25 mL sample of a 0.5 M solution of NaOH is titrated with 0.5 M HCl. What is the volume of HCl required to reach the equivalence point?

A. 25 mL

Correct B. 50 mL

C. 75 mL

D. 100 mL

Correct Answer: B

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Question 25

The s\tandard enthalpy of formation $ ΔH^circ_f $ of CO_2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of CO(g)?

Correct A. -110.5 kJ/mol

B. -111.5 kJ/mol

C. -112.5 kJ/mol

D. -113.5 kJ/mol

Correct Answer: A

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