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POST UTME ELIZADE UNIVERSITY 2017 Chemistry | Objective

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Question 1 View Details

The compound SO2 is a product of the reaction between sulfur and oxygen. What is the oxidation state of sulfur in this compound?

A. 0

B. +2

Correct C. -2

D. +4

Correct Answer: C

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Question 2 View Details

The reaction between chlorine gas and sodium hydroxide solution produces sodium chloride and sodium hypochlorite. Write the balanced chemical equation for this reaction.

Correct A. Cl2 + 2NaOH -> NaCl + NaClO + H2O

B. Cl2 + NaOH -> NaCl + NaClO

C. Cl2 + 2NaOH -> NaCl + Na2O + H2O

D. Cl2 + NaOH -> NaCl + H2O

Correct Answer: A

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Question 3 View Details

The diagram below shows a titration setup.

A. The burette contains the acid.

B. The beaker contains the acid.

Correct C. The burette contains the base.

D. The beaker contains the base.

Correct Answer: C

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Question 4 View Details

The compound SO3 is a product of the reaction between sulfur trioxide and water. What is the oxidation state of sulfur in this compound?

Correct A. +6

B. +4

C. +2

D. 0

Correct Answer: A

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Question 5 View Details

The reaction between sodium hydroxide and acetic acid produces sodium acetate and water. Write the balanced chemical equation for this reaction.

Correct A. NaOH + CH3COOH -> CH3COONa + H2O

B. NaOH + CH3COOH -> Na2CO3 + CH4

C. NaOH + CH3COOH -> Na2CO3 + H2O

D. NaOH + CH3COOH -> CH3COONa + NaOH

Correct Answer: A

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Question 6 View Details

The reaction of cyclohexane with bromine in the presence of light produces a dibromocyclohexane. What is the major product of this reaction?

A. 1,2-dibromocyclohexane

Correct B. 1,4-dibromocyclohexane

C. cis-1,2-dibromocyclohexane

D. trans-1,2-dibromocyclohexane

Correct Answer: B

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Question 7 View Details

The reaction of an alkene with hydrogen in the presence of a palladium catalyst produces an alkane. What is the name of this reaction?

Correct A. Hydrogenation

B. Hydrogenolysis

C. Hydrogenation of alkenes

D. Hydrogenation of alkynes

Correct Answer: A

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Question 8 View Details

The following diagram shows a titration setup. What is the purpose of the burette?

Correct A. To measure the volume of the titrant

B. To measure the volume of the analyte

C. To mix the titrant and analyte

D. To measure the pH of the solution

Correct Answer: A

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Question 9 View Details

The following diagram shows a graph of the reaction of an alkene with hydrogen in the presence of a palladium catalyst. What is the name of this reaction?

Correct A. Hydrogenation

B. Hydrogenolysis

C. Hydrogenation of alkenes

D. Hydrogenation of alkynes

Correct Answer: A

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Question 10 View Details

The reaction of an alkene with ozone produces a ozonide. What is the name of this reaction?

Correct A. Ozonolysis

B. Ozonation

C. Ozonation of alkenes

D. Ozonation of alkynes

Correct Answer: A

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Question 11 View Details

At 298 K, the s\tandard enthalpy change (ΔH°) for the reaction C(s) + O2(g) → CO2(g) is -393.5 kJ/mol. What is the s\tandard entropy change (ΔS°) for the reaction, given that the s\tandard entropy of C(s) is 5.74 J/mol*K and the s\tandard entropy of O2(g) is 205.14 J/mol*K?

Correct A. -213.8 J/mol*K

B. -213.8 kJ/mol*K

C. 213.8 J/mol*K

D. 213.8 kJ/mol*K

Correct Answer: A

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Question 12 View Details

A solution of 0.1 M NaCl is prepared by dissolving 6.0 g of NaCl in 1.0 L of water. What is the concentration of Cl- ions in the solution?

A. 0.1 M

Correct B. 0.05 M

C. 0.2 M

D. 0.05 M

Correct Answer: B

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Question 13 View Details

The equilibrium cons\tant (Kc) for the reaction N2(g) + 3H2(g) → 2NH3(g) is 0.042 at 298 K. What is the equilibrium cons\tant (Kp) for the reaction?

A. 0.042

Correct B. 0.042 atm

C. 0.042 atm^3

D. 0.042 atm^2

Correct Answer: B

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Question 14 View Details

A 10.0 mL sample of a 0.1 M NaOH solution is titrated with a 0.1 M HCl solution. What is the pH of the solution after the titration?

Correct A. 7

B. 8

C. 9

D. 10

Correct Answer: A

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Question 15 View Details

A 2.0 M solution of glu\cose (C6H12O6) is prepared by dissolving 120 g of glu\cose in 1.0 L of water. What is the concentration of glu\cose in the solution?

Correct A. 2.0 M

B. 1.0 M

C. 0.5 M

D. 0.2 M

Correct Answer: A

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Question 16 View Details

The reaction between chlorine gas and sodium hydroxide solution produces a compound that is used as a di\sinfec\tant. What is the name of the compound produced?

A. Chloramine

B. Sodium chloride

C. Chlorine gas

Correct D. Sodium hypochlorite

Correct Answer: D

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Question 17 View Details

A 25.0 cm3 sample of sulfuric acid is titrated with 0.100 M sodium hydroxide. If 25.0 cm3 of sodium hydroxide is required to reach the equivalence point, what is the concentration of the sulfuric acid?

A. 0.100 M

B. 0.200 M

Correct C. 0.500 M

D. 1.00 M

Correct Answer: C

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Question 18 View Details

A metal M has an atomic number of 24 and an atomic mass of 48 g/mol. What is the electronic configuration of the metal?

Correct A. [Ar] 3d^5 4s^2

B. [Ar] 3d^6 4s^1

C. [Ar] 3d^5 4s^1

D. [Ar] 3d^4 4s^2

Correct Answer: A

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Question 19 View Details

A solution contains 0.100 M sodium chloride and 0.100 M calcium chloride. What is the concentration of chloride ions in the solution?

A. 0.100 M

B. 0.200 M

Correct C. 0.300 M

D. 0.400 M

Correct Answer: C

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Question 20 View Details

A 25.0 cm3 sample of a solution containing 0.100 M sodium hydroxide is titrated with 0.100 M hydrochloric acid. If 25.0 cm3 of hydrochloric acid is required to reach the equivalence point, what is the concentration of the sodium hydroxide?

Correct A. 0.100 M

B. 0.200 M

C. 0.500 M

D. 1.00 M

Correct Answer: A

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Question 21 View Details

Determine the number of moles of oxygen gas (O2) produced at STP when 2.5 moles of hydrogen gas (H2) react with oxygen gas according to the equation: 2H2 + O2 → 2H2O.

Correct A. 1.25 moles

B. 2.5 moles

C. 5 moles

D. 10 moles

Correct Answer: A

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Question 22 View Details

A sample of a non-metallic oxide has a mass of 25.0 g and a volume of 2.5 L at STP. Calculate the molar mass of the oxide.

A. 50 g/mol

B. 75 g/mol

Correct C. 100 g/mol

D. 125 g/mol

Correct Answer: C

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Question 23 View Details

A 2.0 L flask contains 0.5 mol of a gas at 25°C. Calculate the pressure of the gas in atm.

A. 1.0 atm

Correct B. 2.0 atm

C. 3.0 atm

D. 4.0 atm

Correct Answer: B

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Question 24 View Details

A 1.0 L flask contains 0.2 mol of a gas at 50°C. Calculate the pressure of the gas in atm.

A. 1.0 atm

Correct B. 2.0 atm

C. 3.0 atm

D. 4.0 atm

Correct Answer: B

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Question 25 View Details

A 2.0 L flask contains 0.5 mol of a gas at 25°C. Calculate the pressure of the gas in atm.

A. 1.0 atm

Correct B. 2.0 atm

C. 3.0 atm

D. 4.0 atm

Correct Answer: B

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