UTME 2017 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 2017 Chemistry (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
A diminishing ozone layer with an increase in ultra-violet radiations is as a result of presence of
Correct A. chlorofluorocarbons
B. hydrocarbon
C. oxides of sulphur
D. oxides of carbon

Correct Answer: A

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Question 2
If the molecular mass of tetraoxosulphate(VI) acid is 98, calculate its vapour density
A. 196
Correct B. 49
C. 106
D. 82

Correct Answer: B

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Question 3
An ore of tin is
A. haematite
B. magnetite
C. bauxite
Correct D. cassiterite

Correct Answer: D

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Question 4
The reagent that can be used to remove carbon(IV) oxide from air is
A. alkaline pyrogallol
B. anhydrous calcium chloride
Correct C. sodium hydroxide
D. yellow phosphorus

Correct Answer: C

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Question 5
The bonding between water molecule and hydrogen ion is
Correct A. dative
B. metallic
C. hydrogen
D. covalent

Correct Answer: A

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Question 6
Organic compounds generally in comparison with inorganic compounds have
A. higher melting and boiling points
B. higher melting points and lower boiling points
Correct C. lower melting and boiling points
D. lower melting points and higher boiling points

Correct Answer: C

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Question 7
The rate of a reaction usually decreases with a decrease in the concentration of reactants because
Correct A. reactants collision decreases
B. reactants collision decreases
C. speed increases
D. kinetic energy decreases

Correct Answer: A

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Question 8
In the presence of water, sulphur(IV) oxide is a strong reducing agent due to the formation of
A. \( \mathrm{SO}_{2}^{2-} \)
Correct B. \( \mathrm{SO}_{3}^{2-} \)
C. \( S^{2-} \)
D. HS

Correct Answer: B

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Question 9
Copper is widely used in the making of electric wires due to its
A. high melting point
Correct B. high ductility
C. low relative density
D. low tensile strength

Correct Answer: B

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Question 10
In the diagram above, the salt that is independent of temperature is
Correct A. \( \mathrm{Ca} \left( \mathrm{OH} \right) 2 \)
B. \( \mathrm{KCl} \)
C. \( \mathrm{NaCl} \)
D. \( \mathrm{KClO} 3 \)

Correct Answer: A

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Question 11
The number of isomers of \( \mathrm{C}_{5} \mathrm{H}_{12} \) is
A. four
Correct B. three
C. two
D. one

Correct Answer: B

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Question 12
A radioactive element weighing 1 kg has a half-life of 100 years, what would be its mass in grams in 300 years
Correct A. 125
B. 500
C. 250
D. 750

Correct Answer: A

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Question 13
The derivative of benzene that can be used in making explosives is
A. aniline
B. xylene
C. phenol
Correct D. toluene

Correct Answer: D

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Question 14
If the vapour density of an organic compound is 78, calculate its molecular formula
Correct A. \( \mathrm{C}_{6} \mathrm{H}_{6} \)
B. \( \mathrm{C}_{11} \mathrm{H}_{\infty} \)
C. \( \mathrm{C}_{10} \mathrm{H}_{10} \)
D. \( \mathrm{C}_{11} \mathrm{H}_{24} \)

Correct Answer: A

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Question 15
Which of the following is used for preserving food?
A. Pentanoic acid
B. Butanoic acid
Correct C. Ethanoic acid
D. Methanoic acid

Correct Answer: C

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Question 16
The gas liberated during the alkaline hydrolysis of amides is
A. hydrogen
B. nitrogen
C. carbon(IV) oxide
Correct D. ammonia

Correct Answer: D

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Question 17
At \( 27^{\circ} \mathrm{C} \), a sample of nitrogen gas occupies
A. 420.00
Correct B. 233.33
C. 712.96
D. 187.66

Correct Answer: B

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Question 18
The compound that can serve as oxidizing and reducing agents in chemical reactions is
Correct A. \( \mathrm{MnO}_{2} \)
B. KMnO
C. \( \mathrm{H}_{2} \mathrm{O} \)
D. \( \mathrm{Na}_{2} \mathrm{SO}_{3} \)

Correct Answer: A

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Question 19
A metal that will react with steam to liberate hydrogen gas is
Correct A. zinc
B. aluminium
C. sodium
D. iron

Correct Answer: A

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Question 20
An organic compound contains 70% carbon, 12% hydrogen and 18% oxygen by mass. Calculate the empirical formula of the compound? \( [H=1.0, C=12.0, O=16.0] \)
A. \( \mathrm{C}_{23} \mathrm{H}_{2} \mathrm{O} \)
Correct B. \( \mathrm{C}_{3} \mathrm{H}_{4} \mathrm{O} \)
C. CHO
D. \( \mathrm{C}_{23} \mathrm{H}_{22} \mathrm{O} \)

Correct Answer: B

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Question 21
The hydrogen ion concentration of a sample of orange juice is \( 2.0 \times 10^{-11} \mathrm{moldm}^{3} \). What is its pOH ? [log, \( 2=0.3010] \)
Correct A. 3.30
B. 13.00
C. 10.70
D. 11.30

Correct Answer: A

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Question 22
\( \mathrm{nCH}_{2}=\mathrm{CH}_{2} \quad-\mathrm{CH}_{2}-\mathrm{CH}_{2} \mathrm{n}- \) The equation above illustrates the manufacture of
A. rubber
B. polystyrene
Correct C. polythene
D. polypropylene

Correct Answer: C

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Question 23
When an unknown salt was warmed with copper turnings and a few drops of concentrated tetraoxosulphate(VI) acid, a reddish-brown gas was evolved. The salt is a:
A. Br -
Correct B. \( \mathrm{NO}_{3}^{-} \)
C. \( \mathrm{SO}_{2}^{2-} \)
D. \( \mathrm{CO}_{2} \)

Correct Answer: B

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Question 24
In an exothermic reaction, change in entropy is usually
A. indeterminate
Correct B. positive
C. negative
D. zero

Correct Answer: B

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Question 25
Calculate the solubility in moldm-3 of 20 g sodium hydroxide dissolved in 100 g of water at \( 25^\circ C \) [Na=23, H=1, O=16]
A. 4.74
Correct B. 5.00
C. 0.70
D. 1.89

Correct Answer: B

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