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POST UTME FUTO 2018 Chemistry | Objective

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Question 1 View Details

A 0.1 M solution of NaCl is prepared by dissolving 2.5 g of NaCl in 100 mL of water. What is the concentration of the solution in mol/L?

A. 0.04 M

B. 0.08 M

Correct C. 0.1 M

D. 0.2 M

Correct Answer: C

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Question 2 View Details

A solution contains 5.0 g of glu\cose (C6H12O6) per 100 mL of solution. What is the molarity of the solution?

A. 0.027 M

B. 0.054 M

Correct C. 0.1 M

D. 0.2 M

Correct Answer: C

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Question 3 View Details

A 2.0 M solution of HCl is prepared by dissolving 40 g of HCl in 100 mL of water. What is the concentration of the solution in mol/L?

A. 0.1 M

B. 0.2 M

Correct C. 0.4 M

D. 0.8 M

Correct Answer: C

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Question 4 View Details

A solution contains 10.0 g of NaOH per 100 mL of solution. What is the molarity of the solution?

A. 0.25 M

B. 0.5 M

C. 0.75 M

Correct D. 1.0 M

Correct Answer: D

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Question 5 View Details

A 1.0 M solution of glu\cose (C6H12O6) is prepared by dissolving 18.016 g of glu\cose in 100 mL of water. What is the concentration of the solution in mol/L?

A. 0.1 M

B. 0.2 M

Correct C. 0.3 M

D. 0.4 M

Correct Answer: C

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Question 6 View Details

A 2.5 g sample of a subs\tance is dissolved in 50 mL of water. If the molar mass of the subs\tance is 180 g/mol, what is the concentration of the solution in molarity?

A. 0.028 M

Correct B. 0.056 M

C. 0.084 M

D. 0.112 M

Correct Answer: B

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Question 7 View Details

A reaction is represented by the equation: 2A + B → 2C + D. If 1.5 moles of A and 0.75 moles of B are present, what is the limiting reac\tant?

A. A

Correct B. B

C. C

D. D

Correct Answer: B

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Question 8 View Details

A gas at 27°C and 1 atm is compressed to 2 atm. What is the new temperature in Kelvin?

A. 300 K

B. 320 K

Correct C. 340 K

D. 360 K

Correct Answer: C

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Question 9 View Details

A 10 mL sample of a solution containing 0.5 M NaOH is mixed with 20 mL of a solution containing 0.2 M HCl. What is the pH of the resulting solution?

A. 1

B. 2

Correct C. 3

D. 4

Correct Answer: C

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Question 10 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 test tube contains the acid.

D. The burette contains the base.

Correct Answer: A

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Question 11 View Details

The atomic radius of an element in the periodic table increases down a group due to the addition of new energy levels. However, the atomic radius of an element in the periodic table decreases across a period due to the increase in effective nuclear charge. Which of the following elements has the largest atomic radius?

A. Rb

B. Cs

C. Fr

Correct D. Ba

Correct Answer: D

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Question 12 View Details

A 2.5 M solution of HCl is titrated with 0.5 M NaOH. If 25 mL of NaOH is required to reach the equivalence point, what is the volume of HCl in liters?

A. 0.125 L

Correct B. 0.25 L

C. 0.5 L

D. 1 L

Correct Answer: B

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Question 13 View Details

A sample of CO2 gas at 25°C and 1 atm is collected over water. If the vapor pressure of water at 25°C is 23.8 mmHg, what is the partial pressure of CO2?

A. 760 mmHg

Correct B. 736.2 mmHg

C. 760 - 23.8 mmHg

D. 760 mmHg - 23.8 mmHg

Correct Answer: B

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Question 14 View Details

A 1.0 M solution of NaOH is titrated with 0.5 M HCl. If 20 mL of HCl is required to reach the equivalence point, what is the number of moles of NaOH?

A. 0.05 mol

Correct B. 0.1 mol

C. 0.2 mol

D. 0.5 mol

Correct Answer: B

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Question 15 View Details

A 2.0 M solution of H2SO4 is titrated with 0.5 M NaOH. If 30 mL of NaOH is required to reach the equivalence point, what is the number of moles of H2SO4?

A. 0.1 mol

B. 0.2 mol

Correct C. 0.3 mol

D. 0.4 mol

Correct Answer: C

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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 2.50 L flask contains 0.250 mol of an ideal gas at 27°C. Calculate the pressure of the gas.

Correct A. 1.01 x 10^5 Pa

B. 1.01 x 10^4 Pa

C. 1.01 x 10^3 Pa

D. 1.01 x 10^2 Pa

Correct Answer: A

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Question 18 View Details

A solution contains 0.0500 M NaCl. What is the concentration of Cl- ions?

A. 0.0500 M

Correct B. 0.100 M

C. 0.0500 M

D. 0.0500 M

Correct Answer: B

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Question 19 View Details

A 50.0 mL sample of a solution contains 0.250 g of KNO3. What is the molarity of the solution?

Correct A. 0.500 M

B. 0.250 M

C. 1.00 M

D. 0.100 M

Correct Answer: A

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Question 20 View Details

A 2.00 L flask contains 0.500 mol of an ideal gas at 27°C. Calculate the number of moles of gas that must be added to the flask to increase the pressure to 1.00 x 10^5 Pa.

A. 0.250 mol

B. 0.500 mol

C. 1.00 mol

Correct D. 0.750 mol

Correct Answer: D

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Question 21 View Details

Determine 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 22 View Details

A 25 mL sample of 0.5 M H2SO4 is titrated with 0.5 M NaOH. What is the pH of the solution after 10 mL of NaOH has been added?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 23 View Details

A metal (X) reacts with dilute HCl to produce a gas (Y). The gas (Y) is collected over water and its density is found to be 1.7 g/L at 20°C. What is the identity of the gas (Y)?

Correct A. CO2

B. H2

C. N2

D. O2

Correct Answer: A

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Question 24 View Details

A sample of a metal (X) is heated in a stream of oxygen to produce a green-colored solid (Y). The solid (Y) is found to be soluble in water. What is the identity of the solid (Y)?

A. CuO

B. Fe2O3

Correct C. MnO2

D. Cr2O3

Correct Answer: C

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Question 25 View Details

A 2.0 g sample of a non-metal (X) is heated in a stream of oxygen to produce a gas (Y). The gas (Y) is collected over water and its density is found to be 1.2 g/L at 20°C. What is the identity of the gas (Y)?

A. CO2

B. H2O

Correct C. SO2

D. Cl2

Correct Answer: C

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