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POST UTME BABCOCK UNIVERSITY 2017 Chemistry | Objective

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Question 1 View Details

At 25°C, the vapor pressure of a solution containing 10.0 g of urea in 100.0 g of water is 75.0 mmHg. What is the molar mass of urea?

A. 60.0 g/mol

Correct B. 120.0 g/mol

C. 180.0 g/mol

D. 240.0 g/mol

Correct Answer: B

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Question 2 View Details

A 0.100 M solution of NaOH is titrated with 0.100 M HCl. What is the pH of the solution after 25.0 mL of HCl has been added?

A. 1.00

B. 2.00

C. 3.00

Correct D. 4.00

Correct Answer: D

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Question 3 View Details

A diagram of a titration setup is shown below.

Correct A. The burette contains the acid.

B. The beaker contains the acid.

C. The burette contains the base.

D. The beaker contains the base.

Correct Answer: A

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Question 4 View Details

A 0.100 M solution of NaOH is titrated with 0.100 M HCl. What is the pH of the solution after 50.0 mL of HCl has been added?

A. 1.00

B. 2.00

C. 3.00

Correct D. 4.00

Correct Answer: D

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Question 5 View Details

A diagram of a titration setup is shown below.

A. The burette contains the acid.

Correct B. The beaker contains the acid.

C. The burette contains the base.

D. The beaker contains the base.

Correct Answer: B

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Question 6 View Details

The rate cons\tant (k) of a first-order reaction is given by the equation: k = 2.303/t \log10\( A0/A \). If the initial concentration of a reac\tant is 0.1 M and the concentration after 10 minutes is 0.05 M, calculate the rate cons\tant (k) in min^-1.

A. 0.0001 min^-1

B. 0.001 min^-1

Correct C. 0.01 min^-1

D. 0.1 min^-1

Correct Answer: C

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Question 7 View Details

A sample of nitrogen gas (N2) is collected over water at a temperature of 298 K and a pressure of 1 atm. If the partial pressure of water vapor is 0.02 atm, calculate the mole \fraction of nitrogen gas in the sample.

A. 0.98

B. 0.99

Correct C. 0.995

D. 0.999

Correct Answer: C

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Question 8 View Details

A solution of sodium hydroxide (NaOH) is prepared by dissolving 25 g of NaOH in 100 mL of water. If the density of the solution is 1.2 g/mL, calculate the molarity of the solution.

A. 0.5 M

Correct B. 1.0 M

C. 1.5 M

D. 2.0 M

Correct Answer: B

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Question 9 View Details

A sample of sulfur (S) is heated in a stream of oxygen gas (O2) to produce sulfur trioxide (SO3). If 10 g of sulfur is heated for 30 minutes, and the rate of formation of SO3 is 0.05 g/min, calculate the percentage yield of SO3.

A. 80%

B. 85%

Correct C. 90%

D. 95%

Correct Answer: C

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Question 10 View Details

A solution of hydrochloric acid (HCl) is prepared by dissolving 50 g of HCl in 100 mL of water. If the density of the solution is 1.2 g/mL, calculate the molarity of the solution.

A. 1.0 M

B. 1.5 M

Correct C. 2.0 M

D. 2.5 M

Correct Answer: C

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Question 11 View Details

Determine the major product of the reaction between 2-methylpropene and HCl.

A. 1-chloro-2-methylpropane

B. 2-chloro-2-methylpropane

Correct C. 1-chloro-2-methylpropane and 2-chloro-2-methylpropane

D. 2-chloro-2-methylpropane only

Correct Answer: C

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Question 12 View Details

Calculate the pH of a 0.1 M solution of HCl.

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 13 View Details

Identify the type of bond present in the molecule CH4.

Correct A. Sigma (σ) bond

B. Pi (π) bond

C. Sigma (σ) and Pi (π) bond

D. Hydrogen bond

Correct Answer: A

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Question 14 View Details

Determine the rate cons\tant (k) for the reaction 2NO + O2 → 2NO2, given that the rate cons\tant at 25°C is 1.0 × 10^\( -3 \) s^\( -1 \) and the activation energy is 100 kJ/mol.

Correct A. 1.0 × 10^\( -2 \) s^\( -1 \)

B. 1.0 × 10^\( -1 \) s^\( -1 \)

C. 1.0 × 10^\( -3 \) s^\( -1 \)

D. 1.0 × 10^\( -4 \) s^\( -1 \)

Correct Answer: A

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Question 15 View Details

Calculate the concentration of OH^\( - \) ions in a solution of 0.1 M NaOH.

Correct A. 0.1 M

B. 0.01 M

C. 0.001 M

D. 0.0001 M

Correct Answer: A

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Question 16 View Details

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(C) = 0 kJ/mol.

Correct A. -1206.60 kJ/mol

B. -1206.61 kJ/mol

C. -1206.59 kJ/mol

D. -1206.62 kJ/mol

Correct Answer: A

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Question 17 View Details

A sample of a non-metallic element has a mass of 2.50 g and a volume of 2.00 cm^3. If the density of the element is 5.50 g/cm^3, what is the molar mass of the element?

Correct A. 32.0 g/mol

B. 32.1 g/mol

C. 32.2 g/mol

D. 32.3 g/mol

Correct Answer: A

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Question 18 View Details

A solution contains 0.150 M NaCl. What is the concentration of Cl- ions in the solution?

Correct A. 0.075 M

B. 0.0750 M

C. 0.0751 M

D. 0.0752 M

Correct Answer: A

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Question 19 View Details

A 0.500 L sample of a solution contains 0.250 g of NaCl. What is the concentration of the solution in g/L?

Correct A. 0.500 g/L

B. 0.501 g/L

C. 0.502 g/L

D. 0.503 g/L

Correct Answer: A

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Question 20 View Details

A 2.00 M solution of NaOH is prepared by dissolving 40.0 g of NaOH in water. What is the volume of the solution in liters?

Correct A. 1.00 L

B. 1.01 L

C. 1.02 L

D. 1.03 L

Correct Answer: A

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Question 21 View Details

At 273.15 K, 1 mole of an ideal gas occupies a volume of 22.4 L. If the temperature is increased to 373.15 K, what is the new volume of the gas, assuming it remains an ideal gas?

Correct A. 44.8 L

B. 22.4 L

C. 11.2 L

D. 5.6 L

Correct Answer: A

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Question 22 View Details

A solution contains 25.0 g of NaCl. If 50.0 mL of 0.100 M AgNO3 is added to the solution, what is the concentration of the resulting solution?

A. 0.0500 M

B. 0.100 M

Correct C. 0.200 M

D. 0.500 M

Correct Answer: C

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Question 23 View Details

A sample of a hydrocarbon has a molecular formula of C5H12. What is the name of the hydrocarbon?

Correct A. Pen\tane

B. Hexane

C. Hep\tane

D. Oc\tane

Correct Answer: A

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Question 24 View Details

A solution contains 10.0 g of K2SO4. If 20.0 mL of 0.100 M HCl is added to the solution, what is the concentration of the resulting solution?

A. 0.0500 M

B. 0.100 M

Correct C. 0.200 M

D. 0.500 M

Correct Answer: C

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Question 25 View Details

A sample of a gas has a volume of 2.00 L at a temperature of 298 K. If the temperature is increased to 373 K, what is the new volume of the gas?

A. 2.00 L

Correct B. 3.00 L

C. 4.00 L

D. 5.00 L

Correct Answer: B

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