Practice Post UTME KSU chemistry 2017 Past Questions

Question 1

Determine the s\tandard enthalpy of formation of CaCO3(s) from the following data: ΔHf(CaO(s)) = -635.09 kJ/mol, ΔHf(CO2(g)) = -393.51 kJ/mol, ΔHf(Ca(s)) = -178.2 kJ/mol.

Correct A. -1206.8 kJ/mol

B. -1206.9 kJ/mol

C. -1206.7 kJ/mol

D. -1206.6 kJ/mol

Correct Answer: A

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Question 2

A 0.500 M solution of NaOH is titrated with a 0.500 M solution of HCl. What is the pH of the solution after the addition of 25.0 mL of HCl?

A. 2.00

Correct B. 2.50

C. 3.00

D. 3.50

Correct Answer: B

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Question 3

The diagram below shows a cell with a salt bridge.

A. The cell is a galvanic cell.

B. The cell is an electrolytic cell.

C. The salt bridge is used to connect the two half-cells.

Correct D. The salt bridge is used to separate the two half-cells.

Correct Answer: D

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Question 4

A 1.00 M solution of NaOH is titrated with a 1.00 M solution of HCl. What is the pH of the solution after the addition of 50.0 mL of HCl?

A. 1.00

Correct B. 2.00

C. 3.00

D. 4.00

Correct Answer: B

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Question 5

The diagram below shows a titration setup.

Correct A. The burette is used to measure the volume of the titrant.

B. The beaker is used to measure the volume of the analyte.

C. The burette is used to measure the volume of the analyte.

D. The beaker is used to measure the volume of the titrant.

Correct Answer: A

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Question 6

The reaction between chlorine gas and sodium hydroxide solution is represented by the equation: Cl2 + 2NaOH → NaCl + NaClO + H2O. What is the oxidation state of chlorine in the product NaClO?

A. 0

B. +1

Correct C. +2

D. +3

Correct Answer: C

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Question 7

A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the number of moles of NaOH required to reach the equivalence point.

A. 0.0025

Correct B. 0.0050

C. 0.0075

D. 0.0100

Correct Answer: B

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Question 8

The diagram below shows a setup for the electrolysis of water.

A. O2 is produced at the anode

Correct B. H2 is produced at the cathode

C. O2 is produced at the cathode

D. H2 is produced at the anode

Correct Answer: B

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Question 9

The pH of a solution is 4.5. What is the concentration of hydrogen ions in the solution?

Correct A. 1.0 x 10^$ -4 $ M

B. 1.0 x 10^$ -5 $ M

C. 1.0 x 10^$ -6 $ M

D. 1.0 x 10^$ -7 $ M

Correct Answer: A

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Question 10

A metal X reacts with chlorine gas to form a white solid. The reaction is represented by the equation: X + Cl2 → XCl2. What is the oxidation state of metal X in the product XCl2?

A. +1

Correct B. +2

C. +3

D. +4

Correct Answer: B

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Question 11

A solution of $0.1, \text{mol}, \text{dm}^{-3}$ of $NaOH$ is mixed with a solution of $0.2, \text{mol}, \text{dm}^{-3}$ of $HCl$. If the volume of the resulting solution is $100, \text{cm}^3$, calculate the concentration of $OH^-$ ions.

Correct A. $0.002, \text{mol}, \text{dm}^{-3}$

B. $0.01, \text{mol}, \text{dm}^{-3}$

C. $0.02, \text{mol}, \text{dm}^{-3}$

D. $0.05, \text{mol}, \text{dm}^{-3}$

Correct Answer: A

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Question 12

A metal $M$ has a s\tandard electrode potential of $-0.5, \text{V}$. What is the s\tandard electrode potential of $M^{2+}$?

A. $-1.0, \text{V}$

Correct B. $-0.5, \text{V}$

C. $0.0, \text{V}$

D. $1.0, \text{V}$

Correct Answer: B

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Question 13

A solution of $0.1, \text{mol}, \text{dm}^{-3}$ of $NaOH$ is mixed with a solution of $0.2, \text{mol}, \text{dm}^{-3}$ of $HCl$. If the volume of the resulting solution is $100, \text{cm}^3$, calculate the concentration of $H^+$ ions.

A. $0.002, \text{mol}, \text{dm}^{-3}$

B. $0.01, \text{mol}, \text{dm}^{-3}$

C. $0.02, \text{mol}, \text{dm}^{-3}$

Correct D. $0.05, \text{mol}, \text{dm}^{-3}$

Correct Answer: D

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Question 14

A metal $M$ has a s\tandard electrode potential of $-0.5, \text{V}$. What is the s\tandard electrode potential of $M^{2+}$?

A. $-1.0, \text{V}$

Correct B. $-0.5, \text{V}$

C. $0.0, \text{V}$

D. $1.0, \text{V}$

Correct Answer: B

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Question 15

A solution of $0.1, \text{mol}, \text{dm}^{-3}$ of $NaOH$ is mixed with a solution of $0.2, \text{mol}, \text{dm}^{-3}$ of $HCl$. If the volume of the resulting solution is $100, \text{cm}^3$, calculate the concentration of $OH^-$ ions.

Correct A. $0.002, \text{mol}, \text{dm}^{-3}$

B. $0.01, \text{mol}, \text{dm}^{-3}$

C. $0.02, \text{mol}, \text{dm}^{-3}$

D. $0.05, \text{mol}, \text{dm}^{-3}$

Correct Answer: A

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