Exam Body

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UTME 2023 Chemistry | Objective

Are you preparing for UTME exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2023 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1

Which of the following separation techniques is extensively employed in the garri processing industry?

A. Filtration

B. Crystallisation

Correct C. Sieving

D. Distillation

Correct Answer: C

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Question 2

The presence of common salt as an impurity in water will cause the boiling point of water to .....

A. be the same

B. be \( 100^{\circ} \mathrm{C} \)

Correct C. increase

D. reduce

Correct Answer: C

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Question 3

The electronic configuration of an element E is \( 1 S^{2} \text{ } 2 S^{2} \text{ } 2 P^{6} \text{ } 3 S^{2} \text{ } 3 P^{6} \text{ } 4 S^{1} \). The element E.....

A. is a halogen

B. is an alkaline earth metal

C. has a stable octet structure

Correct D. is an alkali metal

Correct Answer: D

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Question 4

A salt which loses mass when exposed to air is

A. hygroscopic.

B. deliquescent

Correct C. efflorescent

D. fluorescent

Correct Answer: C

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Question 5

A sample of permanently hard water contains _____ salts

Correct A. \( CaSO_{4} \) and \( MgCO_{3} \)

B. \( CaCl_{2} \) and \( Ca\left(HCO_{3}\right)_{2} \)

C. \( CaSO_{4} \) and \( Mg\left(HCO_{3}\right)_{2} \)

D. \( CaSO_{4} \) and \( CaCO_{3} \)

Correct Answer: A

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Question 6

Exposure to the atmosphere, NaOH pellets absorb moisture and dissolve in it to form a solution. This phenomenon is known as

Correct A. deliquescence

B. efflorescence

C. hydrolysis

D. hygroscopy

Correct Answer: A

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Question 7

The basicities of \(CH_{3} COOH \) and \( H_{2} SO_{4} \) acids, respectively, are.....

Correct A. 1 and 2

B. 4 and 1

C. 3 and 2

D. 4 and 2

Correct Answer: A

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Question 8

Which of the following salts will dissolve in water to give a solution with pH less than 7?

Correct A. \( KHSO_{4} \)

B. \( Zn(OH)Cl \)

C. \( Na_{2}CO_{3} \)

D. \( NaCl \)

Correct Answer: A

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Question 9

When an element can exist in two or more forms in the same physical state, the element is said to exhibit

A. isotopy

B. isomerism

Correct C. allotropy

D. hygroscopy

Correct Answer: C

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Question 10

Determine the number of unpaired electrons in the p-orbitals of an \( O_{2} \) atom.

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 11

The bond type formed between two elements with electronic configurations \( 1S^{2} \text{ } 2S^{2} \text{ } 2P^{6} \text{ } 3S^{1} \) and \( 1S^{2} \text{ } 2S^{2} \text{ } 2P^{5} \), is _____

A. covalent

B. dative

Correct C. ionic

D. metallic

Correct Answer: C

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Question 12

Two elements X and Y have electronic configurations \(1S^{2} \text{ } 2S^{2} \text{ } 2P^{6} \text{ } 2P^{6} \text{ } 3S^{2} \) and \( 1S^{2} \text{ } 2S^{2} 2 P^{4}\) respectively. The chemical formula of the compound formed by X and Y is _____

A. \( X_{2}Y_{3} \)

B. \( XY_{2} \)

C. \( X_{2}Y_{3} \)

Correct D. \( XY \)

Correct Answer: D

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Question 13

Which of the following pollutants is biodegradable?

Correct A. Sewage

B. Plastics

C. Metal scraps

D. Lead compounds

Correct Answer: A

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Question 14

Which of the following is not correct of glucose and fructose? They

Correct A. are structural isomers.

B. reduce Fehling's solution.

C. can be obtained by the hydrolysis of starch.

D. are readily fermented by enzymes.

Correct Answer: A

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Question 15

Which of the following statements is not correct? Group 7 elements

A. are diatomic.

B. are good oxidizing agents.

C. are highly electronegative.

Correct D. have relatively low ionisation Potentials.

Correct Answer: D

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Question 16

Which of the following is suitable for determining different isotopes present in an element which exhibits isotopy?

A. Sensitive weighing balance

B. Cathode ray tube

Correct C. Mass spectrometer

D. Geiger muiler counter

Correct Answer: C

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Question 17

The hydrogen isotope, deuterium which has lost one electron now contains _____

A. 1 electron only

B. 1 electron and 1 proton

Correct C. 0 electron, 1 proton and 1 neutron

D. 1 electron, 1 proton and 2 neutrons.

Correct Answer: C

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Question 18

The electronic configuration of fluoride ion, \( F^{-} \) is _____

A. \( 1 S^{2} 2 S^{2} 2 P^{5} \)

Correct B. \( 1 S^{2} 2 S^{2} 2 P^{6} \)

C. \( 1 S^{2} 2 S^{2} 2 P^{6} 3 S^{2} 3 P^{5} \)

D. \( 1 S^{2} 2 S^{2} 2 P^{6} 3 S^{2} 3 P^{6} \)

Correct Answer: B

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Question 19

Elements of group I, in the periodic table, are _____

A. diatomic

B. highly electronegative

C. electron acceptors

Correct D. good reducing agents

Correct Answer: D

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Question 20

I. The constituents vary in composition. II. The constituents can be separated by physical methods. III. It contains unreactive rare gases. Which of the following combinations entirely consists of reasons why air is classified as a mixture?

Correct A. I and II only

B. I and III only

C. II and III only

D. I, II and III

Correct Answer: A

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Question 21

In the treatment of water for town supply, chlorine is usually used to _____

A. add good taste to the water

Correct B. Kill germs in the water

C. remove bad odour from the water

D. decolourise the water

Correct Answer: B

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Question 22

How many hydrogen ions \( \left(H^{+}\right) \) are contained in \( 100 \text{ cm}^3 \) of 0.40 \( \text{ mol/dm}^3 \) \( H_{2}SO_{4} \) acid? [Na = \(6.02 \times 10^{23} \)]

A. \( 2.4 \times 10^{23} \)

Correct B. \( 4.8 \times 10^{22} \)

C. \( 2.4 \times 10^{22} \)

D. \( 4.8 \times 10^{23} \)

Correct Answer: B

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Question 23

Which of the following gases is the most suitable for performing the fountain experiment?

A. \( \mathrm{N}_{2} \mathrm{O}_{(\mathrm{g})} \)

Correct B. \( \mathrm{HCl}_{(\mathrm{g})} \)

C. \( \mathrm{N}_{2(\mathrm{~g})} \)

D. \( \mathrm{Cl}_{2(\mathrm{~g})} \)

Correct Answer: B

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Question 24

Moist chlorine gas bleaches by ......

A. hydration

B. reduction

C. neutralisation

Correct D. oxidation

Correct Answer: D

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Question 25

In an acid-base titration experiment, \( 23.40 \mathrm{~cm}^{3} \) of \( 0.106 \text{ } \mathrm{moldm}^{-3} \text{ } \mathrm{HNO}_{3} \) acid completely neutralised \( 20.00 \mathrm{~cm}^{3} \) of \( \mathrm{Ca}(\mathrm{OH})_{2(\mathrm{~g})} \). Calculate the molar concentration of the basic solution.

A. 0.026 moldm \( { }^{-3} \)

B. 0.060 moldm \( { }^{-3} \)

Correct C. 0.062 moldm \( { }^{-3} \)

D. 0.620 moldm \( { }^{-3} \)

Correct Answer: C

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