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POST UTME BABCOCK UNIVERSITY 2017 Chemistry | Objective

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Question 1

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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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