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Civil and Mechanical

J Chemistry 23

Written by Admin April 7, 2025April 7, 2025

Jamb Chemistry 2023

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Question 1 of 40

1. Question

Which of the following compounds is an example of an electrovalent bond?

\(NaCl\) (sodium chloride)
Correct Incorrect Correct answer

\({CO}_2\) (carbon dioxide)
Correct Incorrect Correct answer

\({H}_2{O}\) (water)
Correct Incorrect Correct answer

\({CH}_4\) (methane)
Correct Incorrect Correct answer

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Question 2 of 40

2. Question

Which of the following metals is commonly alloyed with copper to make brass?

Iron
Correct Incorrect Correct answer

Nickel
Correct Incorrect Correct answer

Aluminum
Correct Incorrect Correct answer

Zinc
Correct Incorrect Correct answer

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Question 3 of 40

3. Question

What is the trend for ionization energy across a period in the periodic table?

Increases from left to right
Correct Incorrect Correct answer

Remains constant
Correct Incorrect Correct answer

Move
Correct Incorrect Correct answer

Decreases from left to right
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Question 4 of 40

4. Question

Which of the following methods can be used to remove temporary hardness from
water?

Boiling
Correct Incorrect Correct answer

Filtration
Correct Incorrect Correct answer

Distillation
Correct Incorrect Correct answer

Chlorination
Correct Incorrect Correct answer

Correct

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Question 5 of 40

5. Question

Which of the following mixtures is an example of a colloid?

MIlk
Correct Incorrect Correct answer

Orange juice
Correct Incorrect Correct answer

Salt water
Correct Incorrect Correct answer

Sugar dissolved in water
Correct Incorrect Correct answer

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Question 6 of 40

6. Question

What is the IUPAC name for the compound \({CCl}_4\)

Tetrahydrochloride
Correct Incorrect Correct answer

Tetrachloromethane
Correct Incorrect Correct answer

Carbon tetrachloride
Correct Incorrect Correct answer

Chloroform
Correct Incorrect Correct answer

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Question 7 of 40

7. Question

What is the chemical structure of soap and detergent molecules?

Hydrophilic head and hydrophobic tail
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Hydrophilic head and hydrophilic tail
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Hydrophobic head and hydrophobic tail
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Hydrophilic tail and hydrophobic head
Correct Incorrect Correct answer

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Question 8 of 40

8. Question

What is the sum of the oxidation numbers in a neutral compound?

+2
Correct Incorrect Correct answer

-1
Correct Incorrect Correct answer

0
Correct Incorrect Correct answer

+1
Correct Incorrect Correct answer

Correct

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Question 9 of 40

9. Question

What happens to the value of the equilibrium constant \(({K}_c)\) for a reaction if the reaction is reversed?

t becomes zero
Correct Incorrect Correct answer

It becomes negative
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It remains the same
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It becomes the reciprocal of the original value
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Question 10 of 40

10. Question

Stainless steel is an alloy made up of

Iron and zinc
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Copper and tin
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Iron and chromium
Correct Incorrect Correct answer

Iron and carbon
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Question 11 of 40

11. Question

What happens to the position of equilibrium if a reversible reaction is subjected to a decrease in temperature?

The position of equilibrium shifts to the left
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The position of equilibrium shifts to the right.
Correct Incorrect Correct answer

The position of equilibrium remains unchanged
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The reaction stops
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Question 12 of 40

12. Question

Which functional group is present in alkanals?

Carbonyl group \((C=O)\)
Correct Incorrect Correct answer

Hydroxyl group \((-OH)\)
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Alkyl group \((-R)\)
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Carboxyl group \((-COOH)\)
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Question 13 of 40

13. Question

What is the maximum number of electrons that can occupy the second energy level (n=2)?

2 electrons
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18 electrons
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8 electrons
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32 electrons
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Question 14 of 40

14. Question

What is the main environmental concern associated with sulfur dioxide emissions?

Formation of acid rain
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Global warming potential
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Depletion of the stratospheric ozone
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Depletion of the ozone layer
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Question 15 of 40

15. Question

A gas occupies a volume of 1.5 liters at a pressure of 2 atmospheres. If the pressure is increased to 4 atmospheres while the temperature remains constant, what will be the new volume of the gas?

6 liters
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1.5 liters
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0.75 Litres
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3 litres
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Question 16 of 40

16. Question

Which organic compound is responsible for the characteristic aroma of fruits?

Alkane
Correct Incorrect Correct answer

Alkyne
Correct Incorrect Correct answer

Ester
Correct Incorrect Correct answer

Amine
Correct Incorrect Correct answer

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Question 17 of 40

17. Question

Which of the following is a unique property of water compared to other liquids?

It is a poor solvent
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It does not evaporate
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It expands when freezing
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It has a low heat capacity
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Question 18 of 40

18. Question

The contact process is used for the industrial production of

sulfuric acid \(({H}_2{SO}_4)\)
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Hydrochloric acid \((HCl)\)
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Sodium hydroxide \((NaOH)\)
Correct Incorrect Correct answer

Calcium oxide \((CaO)\)
Correct Incorrect Correct answer

Correct

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Question 19 of 40

19. Question

Identify the reducing agent in the following reaction:

\(\text{Zn} + \text{CuSO}_{4} \;\rightarrow\; \text{ZnSO}_{4} + \text{Cu}\)

Cu

Correct Incorrect Correct answer

Zn

Correct Incorrect Correct answer

ZnSO₄

Correct Incorrect Correct answer

CuSO₄

Correct Incorrect Correct answer

Correct

Incorrect
Question 20 of 40

20. Question

The heat of reaction can be determined experimentally using a device called a

Calorimeter
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Barometer
Correct Incorrect Correct answer

Spectrometer
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Thermometer
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Correct

Incorrect
Question 21 of 40

21. Question

What is eutrophication?

The release of harmful chemicals into water bodies
Correct Incorrect Correct answer

The excessive growth of algae due to nutrient enrichment
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The presence of heavy metals in water
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The formation of oil slicks on water surfaces
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Incorrect
Question 22 of 40

22. Question

Which of the following statements is true regarding the melting and boiling points of pure substances?

The boiling point is always higher than the melting point
Correct Incorrect Correct answer

The melting point is always higher than the boiling point
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The melting and boiling points are always the same for all substances
Correct Incorrect Correct answer

The melting and boiling points can vary depending on the substance
Correct Incorrect Correct answer

Correct

Incorrect
Question 23 of 40

23. Question

Which type of salt is found in antacid medications and is used to relieve heartburn and indigestion?

Aluminum chloride
Correct Incorrect Correct answer

Magnesium chloride
Correct Incorrect Correct answer

Sodium chloride
Correct Incorrect Correct answer

Calcium chloride
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Question 24 of 40

24. Question

Balance the following redox reaction:

\(\text{Fe}_{2}\text{O}_{3} + \text{CO} \;\rightarrow\; \text{Fe} + \text{CO}_{2}\)

\(\text{Fe}_{2}\text{O}_{3} + \text{CO} \;\rightarrow\; 2\text{Fe} + 2\text{CO}_{2}\)

Correct Incorrect Correct answer

\(2\text{Fe}_{2}\text{O}_{3} + 3\text{CO} \;\rightarrow\; 4\text{Fe} + 3\text{CO}_{2}\)

Correct Incorrect Correct answer

\(\text{Fe}_{2}\text{O}_{3} + 2\text{CO} \;\rightarrow\; 2\text{Fe} + 2\text{CO}_{2}\)

Correct Incorrect Correct answer

\(\text{Fe}_{2}\text{O}_{3} + 3\text{CO} \;\rightarrow\; 2\text{Fe} + 3\text{CO}_{2}\)

Correct Incorrect Correct answer

Correct

Incorrect
Question 25 of 40

25. Question

What is the principal ore of iron, from which iron is extracted?

Calcite
Correct Incorrect Correct answer

Bauxite
Correct Incorrect Correct answer

Magnetite
Correct Incorrect Correct answer

Hematite
Correct Incorrect Correct answer

Correct

Incorrect
Question 26 of 40

26. Question

Which of the following is an example of a primary cell?

Alkaline battery
Correct Incorrect Correct answer

Fuel cell
Correct Incorrect Correct answer

Lead-acid battery
Correct Incorrect Correct answer

Lithium-ion battery
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Correct

Incorrect
Question 27 of 40

27. Question

When anhydrous cobalt chloride paper is exposed to water, what color change is observed

From pink to blue
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From white to blue
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From blue to white
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From blue to pink
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Incorrect
Question 28 of 40

28. Question

Which of the following methods is commonly used to remove suspended impurities from water?

Floridation
Correct Incorrect Correct answer

Chlorination
Correct Incorrect Correct answer

Filtration
Correct Incorrect Correct answer

Distillation
Correct Incorrect Correct answer

Correct

Incorrect
Question 29 of 40

29. Question

Sodium reacts vigorously with water to produce

Sodium chloride \((NaCl)\) and oxygen gas \(({O}_2)\)
Correct Incorrect Correct answer

Sodium nitrate \((NaNO_3)\) and water \(({H}_2{O})\)
Correct Incorrect Correct answer

Sodium hydroxide \((NaOH)\) and hydrogen gas \(({H}_2)\)

Correct Incorrect Correct answer

Sodium oxide \(({Na}_2{O})\) and hydrogen gas \(({H}_2)\)

Correct Incorrect Correct answer

Correct

Incorrect
Question 30 of 40

30. Question

When a substance is oxidized, it

Loses electrons
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Gains oxygen atoms
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Gains electron
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Loses protons (\({H}\)+ ions)
Correct Incorrect Correct answer

Correct

Incorrect
Question 31 of 40

31. Question

Which of the following is a common laboratory indicator for bases?

Methyl orange
Correct Incorrect Correct answer

Phenolphthalein
Correct Incorrect Correct answer

Bromothymol blue
Correct Incorrect Correct answer

Litmus
Correct Incorrect Correct answer

Correct

Incorrect
Question 32 of 40

32. Question

At room temperature and standard pressure, chlorine gas is in which state of matter?

Plasma
Correct Incorrect Correct answer

Solid
Correct Incorrect Correct answer

Liquid
Correct Incorrect Correct answer

Gas
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Incorrect
Question 33 of 40

33. Question

An element has an atomic number of 8 and a mass number of 16. How many neutrons does this element have?

24
Correct Incorrect Correct answer

16
Correct Incorrect Correct answer

8
Correct Incorrect Correct answer

33
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Question 34 of 40

34. Question

What is the main source of carbon monoxide \((CO)\) in urban areas?

Volcanic eruptions
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Vehicle emissions
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Forest fires
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Industrial processes
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Question 35 of 40

35. Question

Benzene can be converted to its derivative toluene by the addition of a methyl group. The reaction is an example of

Nucleophilic substitution
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Elimination reaction
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Electrophilic substitution
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Addition reaction
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Question 36 of 40

36. Question

What is the valency of an element with the electronic configuration 2, 8, 7?

7
Correct Incorrect Correct answer

1
Correct Incorrect Correct answer

2
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3
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Correct

Incorrect
Question 37 of 40

37. Question

Which of the following is a characteristic property of acids?

Turn litmus paper blue
Correct Incorrect Correct answer

Bitter taste
Correct Incorrect Correct answer

pH value above 7
Correct Incorrect Correct answer

React with metals to produce hydrogen gas
Correct Incorrect Correct answer

Correct

Incorrect
Question 38 of 40

38. Question

Which of the following is a primary constituent of crude oil?

Pentane
Correct Incorrect Correct answer

Ethanol
Correct Incorrect Correct answer

Heptane
Correct Incorrect Correct answer

Methane
Correct Incorrect Correct answer

Correct

Incorrect
Question 39 of 40

39. Question

Which of the following reactions would be expected to have the highest entropy change?

Liquid \(\rightarrow\\) Gas
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Solid \(\rightarrow\\) Liquid
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Gas \(\rightarrow\\) Liquid
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Gas \(\rightarrow\\) Solid
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Question 40 of 40

40. Question

When an acidic solution is diluted, what happens to its pH?

It depends on the specific acid
Correct Incorrect Correct answer

It decreases
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It remains the same
Correct Incorrect Correct answer

It increases
Correct Incorrect Correct answer

Correct

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