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POST UTME ABU 2020 Chemistry | Objective

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Question 1 View Details

A 2.50 g sample of a non-volatile solute is dissolved in 25.0 cm³ of water at 25°C. Calculate the molality of the solution.

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 2 View Details

The pH of a 0.10 M solution of a weak acid HA is 4.25. Calculate the value of Ka for the acid.

A. 1.0 x 10^$ -4 $

Correct B. 1.0 x 10^$ -5 $

C. 1.0 x 10^$ -6 $

D. 1.0 x 10^$ -7 $

Correct Answer: B

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Question 3 View Details

A 2.50 g sample of a non-volatile solute is dissolved in 25.0 cm³ of water at 25°C. Calculate the molality of the solution.

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 4 View Details

The pH of a 0.10 M solution of a weak acid HA is 4.25. Calculate the value of Ka for the acid.

A. 1.0 x 10^$ -4 $

Correct B. 1.0 x 10^$ -5 $

C. 1.0 x 10^$ -6 $

D. 1.0 x 10^$ -7 $

Correct Answer: B

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Question 5 View Details

A 2.50 g sample of a non-volatile solute is dissolved in 25.0 cm³ of water at 25°C. Calculate the molality of the solution.

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 6 View Details

Determine the pH of a 0.1 M solution of acetic acid (CH3COOH) at 25°C. The dissociation cons\tant (Ka) of acetic acid is 1.8 × 10^$ -5 $.

A. 2.9

Correct B. 3.9

C. 4.9

D. 5.9

Correct Answer: B

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Question 7 View Details

A sample of polystyrene (PS) has a density of 1.05 g/cm3. If 25.0 g of PS is dissolved in 100.0 mL of chloroform, calculate the molar concentration of the polymer.

A. 0.25 M

Correct B. 0.50 M

C. 0.75 M

D. 1.00 M

Correct Answer: B

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Question 8 View Details

A 2.50 L flask contains 0.500 mol of an unknown gas at 25°C. Calculate the partial pressure of the gas u\sing the ideal gas law.

A. 0.500 atm

B. 0.750 atm

Correct C. 1.00 atm

D. 1.25 atm

Correct Answer: C

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Question 9 View Details

A 0.100 M solution of sodium hydroxide (NaOH) is titrated with 0.100 M hydrochloric acid (HCl). Calculate the pH of the solution after 25.0 mL of HCl has been added.

A. 2.0

Correct B. 3.0

C. 4.0

D. 5.0

Correct Answer: B

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Question 10 View Details

A sample of glu\cose (C6H12O6) has a mass of 25.0 g. Calculate the number of moles of glu\cose present.

A. 0.500 mol

B. 0.750 mol

Correct C. 1.00 mol

D. 1.25 mol

Correct Answer: C

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Question 11 View Details

Determine the pH of a 0.1 M solution of HCl at 25°C.

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 12 View Details

A 25 mL sample of 0.5 M H2SO4 is titrated with 1 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.

A. 10 mL

B. 20 mL

Correct C. 30 mL

D. 40 mL

Correct Answer: C

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Question 13 View Details

A solution contains 0.1 M HCl and 0.2 M NaOH. Determine the pH of the solution.

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 14 View Details

A 50 mL sample of 0.5 M HCl is titrated with 1 M NaOH. Calculate the pH of the solution at the equivalence point.

Correct A. 1

B. 2

C. 3

D. 4

Correct Answer: A

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Question 15 View Details

A solution contains 0.1 M HCl and 0.1 M NaOH. Determine the pH of the solution.

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 16 View Details

A 25.0 cm$^3$ sample of 0.150 M HCl is titrated with 0.200 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.

A. 12.5 cm$^3$

B. 25.0 cm$^3$

Correct C. 37.5 cm$^3$

D. 50.0 cm$^3$

Correct Answer: C

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Question 17 View Details

A metal (M) reacts with chlorine gas to form a white solid. The reaction is as follows: M + Cl$_2$ → MCl$_2$. If 2.50 g of M is reacted with 1.00 g of Cl$_2$, what is the limiting reac\tant?

A. M

Correct B. Cl$_2$

C. Neither M nor Cl$_2$ is the limiting reac\tant.

D. Insufficient information to determine the limiting reac\tant.

Correct Answer: B

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Question 18 View Details

A 2.00 M solution of H$_2$SO$_4$ is mixed with a 1.00 M solution of NaOH. The reaction is as follows: H$_2$SO$_4$ + 2NaOH → Na$_2$SO$_4$ + 2H$_2$O. What is the pH of the resulting solution?

A. 1.00

Correct B. 2.00

C. 3.00

D. 4.00

Correct Answer: B

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Question 19 View Details

A 10.0 g sample of a metal (M) is heated in a crucible until it melts. The resulting liquid is then cooled and solidified. What is the resulting solid?

Correct A. The resulting solid is the same as the original metal.

B. The resulting solid is a different metal.

C. The resulting solid is a compound.

D. The resulting solid is a mixture.

Correct Answer: A

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Question 20 View Details

A 5.00 g sample of a metal (M) is reacted with a 10.0 g sample of a non-metal (N) to form a compound. The reaction is as follows: M + N → MN. What is the empirical formula of the resulting compound?

A. M$_2$N

Correct B. MN

C. N$_2$M

D. The empirical formula cannot be determined.

Correct Answer: B

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Question 21 View Details

Determine the pH of a 0.1 M solution of HCl, given that the dissociation cons\tant of HCl is 10^$ -7 $ and the concentration of HCl is 0.1 M.

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 NaOH is titrated with 1 M HCl. Calculate the number of moles of HCl required to reach the equivalence point.

A. 0.0125

Correct B. 0.025

C. 0.05

D. 0.1

Correct Answer: B

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Question 23 View Details

A polymer has a molecular weight of 50000 g/mol and a degree of polymerization of 100. Calculate the molar mass of the repeating unit.

A. 500

Correct B. 1000

C. 2000

D. 5000

Correct Answer: B

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Question 24 View Details

A 2.0 g sample of a hydrocarbon is burned in a bomb calorimeter, relea\sing 4200 J of heat. Calculate the heat of combustion per gram of the hydrocarbon.

A. 2100

Correct B. 4200

C. 6300

D. 8400

Correct Answer: B

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Question 25 View Details

A 1.0 M solution of NaOH is titrated with 1.0 M HCl. Calculate the pH of the solution at the equivalence point.

A. 7

Correct B. 8

C. 9

D. 10

Correct Answer: B

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