UTME 2020 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 2020 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1
A red precipitate of copper (I) carbide is formed when ammonium solution of copper (I) chloride is introduced into
A. CH₃-C≡C-CH
Correct B. HC≡CH
C. CH₂=CH-CH₂CH₃
D. CH₃CH₂CH₂CH₃

Correct Answer: B

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Question 2
The most important use of hydrogen is in the
A. manufacture of methyl alcohol
B. manufacture of ethyl alcohol
C. hydrogenation of oils
Correct D. manufacture of ammonia

Correct Answer: D

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Question 3
Which of the following polymers is suitable for packaging and electrical insulation?
Correct A. Polyethene
B. Polystyrene
C. Polyamide
D. Polycarbonate

Correct Answer: A

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Question 4
The boiling of fat and aqueous caustic soda is referred to as
A. acidification
B. hydrolysis
Correct C. saponification
D. esterification

Correct Answer: C

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Question 5
Ordinary glass is manufactured from silica, CaCO₃ and
A. NaHCO₃
B. K₂SO₄
C. K₂CO₃
Correct D. Na₂CO₃

Correct Answer: D

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Question 6
\( \begin{array}{ccccccc} & & OH & & & & \\ & & \big| & & & & \\ CH_3 & - & C & - & CH_2 & - & CH_3 \\ & & \big| & & & & \\ & & CH_3 & & & & \end{array} \) The major product of the dehydration of the compound above is
A. \( \begin{array}{ccccccc} & & H & & & & \\ & & \big| & & & & \\ CH_3 & - & C & - & CH_2 & - & CH_3 \\ & & \big| & & & & \\ & & CH_3 & & & & \end{array} \)
Correct B. \( \begin{array}{ccccccc} \text{CH}_3 & - & \text{C} & = & \text{CH} & - & \text{CH}_3 \\ & & | \\ & &\text{CH}_3 \end{array} \)
C. \( \begin{array}{ccccccc} \text{CH}_3 & - & \text{CH} & - & \text{CH} & = & \text{CH}_3 \\ & & | \\ & &\text{CH}_3 \end{array} \)
D. \( \begin{array}{ccccccc} \text{CH}_3 & - & \text{C} & - & \text{CH}_2 & - & \text{CH}_3 \\ & & || \\ & &\text{CH}_2 \end{array} \)

Correct Answer: B

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Question 7
Which of the following is a physical change?
Correct A. Freezing ice-cream
B. dissolving calcium in water
C. Burning kerosine
D. Exposing white phosphorous to air.

Correct Answer: A

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Question 8
In the equation \( 3 Cu + pHNO₃ → 3 Cu(NO₃)₂ + 4 H₂O + xNO \\ \) , the values of p and x respectively are
Correct A. 8 and 2
B. 6 and 2
C. 2 and 3
D. 1 and 3

Correct Answer: A

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Question 9
The filter in a cigarette reduces the nicotine content by
Correct A. adsorption
B. absorption
C. burning
D. evaporation

Correct Answer: A

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Question 10
A gas exerts pressure on its container because
Correct A. the molecules of a gas collide with the walls of the container
B. some of its molecules are moving faster than others
C. of the collision of the molecules with each other
D. of the mass of the molecules of gas.

Correct Answer: A

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Question 11
When cathode rays are deflected onto the electrode of an electrometer, the instrument becomes
A. bipolar
Correct B. negatively charged
C. neutral
D. none of the above

Correct Answer: B

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Question 12
Which of the following are structural isomers?
A. Propanoic acid and propan-1,2-diol
Correct B. Propanal and propanone
C. Ethanoic acid and propanoic acid
D. Ethan-1,2-diol and ethanoic acid.

Correct Answer: B

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Question 13
In the purification of impure samples of ethyl ethanoate synthesized by esterification, concentrated sodium trioxocarbonate (IV) solution is used to remove
A. water
B. basic impurities
Correct C. acidic impurities
D. ethoxyethane.

Correct Answer: C

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Question 14
How many hydrogen atoms does a single ring cycloalkane have less than the corresponding open-chain alkane?
Correct A. Two
B. Three
C. Four
D. One

Correct Answer: A

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Question 15
Equal moles of ethyne and hydrogen iodide react to give
A. CH₂=CH₂
B. CH₂-CHI
C. CH₃Cl₃
Correct D. CH₂CHI

Correct Answer: D

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Question 16
A substance that is used as a ripening agent for fruits is
Correct A. ethene
B. propene
C. methane
D. butane

Correct Answer: A

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Question 17
25 cm³ of a mixture of noble gases was obtained from air after the removal of other constituents. What was the original volume of air?
Correct A. 2500 cm³
B. 1250 cm³
C. 125 cm³
D. 80 cm³

Correct Answer: A

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Question 18
The solubility curve shows the variation of solute concentration with
A. volume
Correct B. temperature
C. vapour density
D. pressure.

Correct Answer: B

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Question 19
Which of the following is used as a rocket fuel?
A. H₂SO₄
B. HCl
Correct C. HNO₃
D. CH₃COOH

Correct Answer: C

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Question 20
In the electrolysis of CuSO₄(aq) using platinum electrodes, the reaction at the anode is
A. \( 4 H⁺ + 4 e⁻ → 2 H₂ \)
B. \( 2 OH⁻ + 2 OH⁻ → 2 H₂O + O₂ \)
C. \( 2 OH⁻ - 2 e⁻ → 2 OH \)
Correct D. \( 4 OH⁻ - 4 e⁻ → 2 H₂O + O₂ \)

Correct Answer: D

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Question 21
In which of the following is the oxidation number of sulphur equal to -2?
Correct A. H₂S
B. SO₃
C. S₈
D. SO₂

Correct Answer: A

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Question 22
\( 5 SO₂(g) + 2 KMnO₄(q) + 2 H₂O(l) → K₂SO₄(q) + 2 MnSO₄(aq) + 2 H₂SO₄(aq) \\ \) In the reaction above, the products give a
Correct A. colourless solution
B. purple precipitate
C. purple solution
D. colourless precipitate.

Correct Answer: A

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Question 23
The solution that will conduct the highest amount of electricity is
A. 2.0 mol dm⁻³ of ethanoic acid
B. 0.5 mol dm⁻³ ethanoic acid
Correct C. 2.0 mol dm⁻³ of hydrochloric acid
D. 0.5 mol dm⁻³ of hydrochloric acid.

Correct Answer: C

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Question 24
What is the molar mass of a substance, if 0.4 mole of the substance has a mass of 25.0 g?
A. 6.3 g
B. 40.0 g
Correct C. 62.5 g
D. 2.5 g

Correct Answer: C

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Question 25
The order in which a mixture of sand, ammonium chloride and sodium chloride can be separated is
Correct A. sublimation → dissolution → filtration → evaporation
B. dissolution → filtration → evaporation
C. filtration → sublimation → evaporation→ dryness
D. dissolution → filtration → sublimation → evaporation

Correct Answer: A

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