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Civil and Mechanical

J Chemistry 21

Written by Admin April 7, 2025April 7, 2025

Jamb Chemistry 2021

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Question 1 of 40

1. Question

Which of the following are chemical changes?
I. cooking of food
II. digestion of food
III. freezing of water
IV. water is heated up

I and II
Correct Incorrect Correct answer

I,II and III
Correct Incorrect Correct answer

II and IV
Correct Incorrect Correct answer

All of the above
Correct Incorrect Correct answer

Correct

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Question 2 of 40

2. Question

A 'breath test' used by traffic police to check drunken driving uses?

Tumeric on filter paper
Correct Incorrect Correct answer

Silica gel coated with saliva nitrate
Correct Incorrect Correct answer

Potassium permanganate-sulphuric acid
Correct Incorrect Correct answer

Potassium dichromatic-sulphuric acid
Correct Incorrect Correct answer

Correct

Incorrect
Question 3 of 40

3. Question

The inherited traits of an organism are controlled by?

RNA molecules
Correct Incorrect Correct answer

Nucleotides
Correct Incorrect Correct answer

DNA molecules
Correct Incorrect Correct answer

Enzymes
Correct Incorrect Correct answer

Correct

Incorrect
Question 4 of 40

4. Question

Oxygen is absent in?

Kerosene
Correct Incorrect Correct answer

Soil
Correct Incorrect Correct answer

Glass
Correct Incorrect Correct answer

Cement
Correct Incorrect Correct answer

Correct

Incorrect
Question 5 of 40

5. Question

A solution contains 20g of solute in 180g of solvent. If the solvent is water, what is the
concentration of the solution in terms of mass by mass percentage

11%
Correct Incorrect Correct answer

22.2%
Correct Incorrect Correct answer

10%
Correct Incorrect Correct answer

20%
Correct Incorrect Correct answer

Correct

Incorrect
Question 6 of 40

6. Question

The reactivity of fluorine is due to?

its high electro negativity
Correct Incorrect Correct answer

small size of fluorine atom
Correct Incorrect Correct answer

availability of D-orbitals
Correct Incorrect Correct answer

strong f-f bond
Correct Incorrect Correct answer

Correct

Incorrect
Question 7 of 40

7. Question

The compounds made up of only carbon and hydrogen are called?

Carbon compounds
Correct Incorrect Correct answer

Hydro carbons
Correct Incorrect Correct answer

Atom
Correct Incorrect Correct answer

Carbon hydrolysis
Correct Incorrect Correct answer

Correct

Incorrect
Question 8 of 40

8. Question

220g of carbon dioxide contains ----- moles

5
Correct Incorrect Correct answer

6
Correct Incorrect Correct answer

3
Correct Incorrect Correct answer

4
Correct Incorrect Correct answer

Correct

Incorrect
Question 9 of 40

9. Question

The gas which causes global warming is?

O₂
Correct Incorrect Correct answer

CO₂
Correct Incorrect Correct answer

N₂
Correct Incorrect Correct answer

He
Correct Incorrect Correct answer

Correct

Incorrect
Question 10 of 40

10. Question

Which of the following is a non-metal that remains liquid at room temperature?

Chlorine
Correct Incorrect Correct answer

Phosphorus
Correct Incorrect Correct answer

Bromine
Correct Incorrect Correct answer

Helium
Correct Incorrect Correct answer

Correct

Incorrect
Question 11 of 40

11. Question

Give the common name for the following compound: (CH₃)₂CHCH₂-Br

Isobutyl bromide
Correct Incorrect Correct answer

Methyl bromide
Correct Incorrect Correct answer

propyl bromide
Correct Incorrect Correct answer

Butyl bromide
Correct Incorrect Correct answer

Correct

Incorrect
Question 12 of 40

12. Question

The mass number of a nucleus is?

Always less than its atomic number
Correct Incorrect Correct answer

The sum of the number of protons and neutrons present in the nucleus
Correct Incorrect Correct answer

Always more than the atomic weight
Correct Incorrect Correct answer

A fraction
Correct Incorrect Correct answer

Correct

Incorrect
Question 13 of 40

13. Question

The nucleus of a hydrogen atom consist of a?

1 proton only
Correct Incorrect Correct answer

1 proton, 2 neutron
Correct Incorrect Correct answer

1 neutron only
Correct Incorrect Correct answer

1 electron only
Correct Incorrect Correct answer

Correct

Incorrect
Question 14 of 40

14. Question

A binary compound of oxygen with another element is referred to as?

Oxide
Correct Incorrect Correct answer

Element
Correct Incorrect Correct answer

Carbon
Correct Incorrect Correct answer

Nitrogen
Correct Incorrect Correct answer

Correct

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Question 15 of 40

15. Question

The molar enthalpy change accompanying the removal of an electron from a gas phase atom or
ion in its ground state is called?

Electron gain enthalpy
Correct Incorrect Correct answer

Ionization enthalpy
Correct Incorrect Correct answer

Enthalpy change
Correct Incorrect Correct answer

Enthalpic gas remover
Correct Incorrect Correct answer

Correct

Incorrect
Question 16 of 40

16. Question

A chemical process in which there is a gain of electrons is known as?

Sublimation
Correct Incorrect Correct answer

Reduction
Correct Incorrect Correct answer

Oxidation
Correct Incorrect Correct answer

Distillation
Correct Incorrect Correct answer

Correct

Incorrect
Question 17 of 40

17. Question

The enzyme that converts glucose to ethyl alcohol is?

Maltase
Correct Incorrect Correct answer

Zymase
Correct Incorrect Correct answer

Diatase
Correct Incorrect Correct answer

Invertase
Correct Incorrect Correct answer

Correct

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Question 18 of 40

18. Question

The nucleus of an atom consists of?

Electrons and neutrons
Correct Incorrect Correct answer

Electrons and protons
Correct Incorrect Correct answer

Protons and neutrons
Correct Incorrect Correct answer

None of the above
Correct Incorrect Correct answer

Correct

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Question 19 of 40

19. Question

The fourteen elements (atomic number 90-103) after actinium are called?

Actinoids
Correct Incorrect Correct answer

Nucleotides
Correct Incorrect Correct answer

Pre-actinum elements
Correct Incorrect Correct answer

Atomic element
Correct Incorrect Correct answer

Correct

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Question 20 of 40

20. Question

Which one of the following is not a mixture?

Air
Correct Incorrect Correct answer

Mecury
Correct Incorrect Correct answer

Milk
Correct Incorrect Correct answer

Cement
Correct Incorrect Correct answer

Correct

Incorrect
Question 21 of 40

21. Question

The only metal that is anti-bacterial is?

Iron
Correct Incorrect Correct answer

Sodium
Correct Incorrect Correct answer

Aluminum
Correct Incorrect Correct answer

Copper
Correct Incorrect Correct answer

Correct

Incorrect
Question 22 of 40

22. Question

The scientist who stated that matter can be converted into energy is?

Boyle
Correct Incorrect Correct answer

Lavoiser
Correct Incorrect Correct answer

Avogadro
Correct Incorrect Correct answer

Einstein
Correct Incorrect Correct answer

Correct

Incorrect
Question 23 of 40

23. Question

What is the chemical name for the compound CuCO₃?

Copper (iii) carbonate
Correct Incorrect Correct answer

Copper (ii) carbonate
Correct Incorrect Correct answer

Copper (i) carbonate
Correct Incorrect Correct answer

Copper
Correct Incorrect Correct answer

Correct

Incorrect
Question 24 of 40

24. Question

In troposphere, the two types of pollutants are?

Gaseous and particulate pollutants
Correct Incorrect Correct answer

Carbon and metallic pollutants
Correct Incorrect Correct answer

Natural and man-made pollutants
Correct Incorrect Correct answer

Sulphuric and nitrogenous pollutants
Correct Incorrect Correct answer

Correct

Incorrect
Question 25 of 40

25. Question

One of the following is not a physical property of monosaccharides?

Monosaccharides get charred when heated
Correct Incorrect Correct answer

Monosaccharides are water-soluble, sweet substances
Correct Incorrect Correct answer

They are highly vital to the exploration of metals
Correct Incorrect Correct answer

They can be reduced to sugar alcohols
Correct Incorrect Correct answer

Correct

Incorrect
Question 26 of 40

26. Question

Soaps clean surfaces on the principle based on

viscosity
Correct Incorrect Correct answer

floatation
Correct Incorrect Correct answer

elasticity
Correct Incorrect Correct answer

Surface tension
Correct Incorrect Correct answer

Correct

Incorrect
Question 27 of 40

27. Question

Which of the following is a form of calcium carbonate?
I. limestone
II. marble
III. chalk
Iv. egg-shells

I only
Correct Incorrect Correct answer

I, II and IV
Correct Incorrect Correct answer

I and II only
Correct Incorrect Correct answer

I, II, III, and IV
Correct Incorrect Correct answer

Correct

Incorrect
Question 28 of 40

28. Question

The most abundant rare gas in the atmosphere is?

He
Correct Incorrect Correct answer

Ne
Correct Incorrect Correct answer

Ar
Correct Incorrect Correct answer

Xe
Correct Incorrect Correct answer

Correct

Incorrect
Question 29 of 40

29. Question

The heat required to raise the temperature of the body by 1k is called?

Specific capacity
Correct Incorrect Correct answer

Thermal capacity
Correct Incorrect Correct answer

Water equivalent
Correct Incorrect Correct answer

None of the above
Correct Incorrect Correct answer

Correct

Incorrect
Question 30 of 40

30. Question

The reactions involving simultaneous oxidation and reduction?

Automatic reactions
Correct Incorrect Correct answer

Alternate reactions
Correct Incorrect Correct answer

Reduction agency
Correct Incorrect Correct answer

Redox reactions
Correct Incorrect Correct answer

Correct

Incorrect
Question 31 of 40

31. Question

The maximum electron in N shell is?

2
Correct Incorrect Correct answer

8
Correct Incorrect Correct answer

18
Correct Incorrect Correct answer

32
Correct Incorrect Correct answer

Correct

Incorrect
Question 32 of 40

32. Question

The metal used to recover copper from a solution of copper sulphate is

Na
Correct Incorrect Correct answer

Ag
Correct Incorrect Correct answer

Hg
Correct Incorrect Correct answer

Fe
Correct Incorrect Correct answer

Correct

Incorrect
Question 33 of 40

33. Question

Neutrons were discovered by?

James Chadwick
Correct Incorrect Correct answer

Ernest Rutherford
Correct Incorrect Correct answer

J.J Thompson
Correct Incorrect Correct answer

John Dalton
Correct Incorrect Correct answer

Correct

Incorrect
Question 34 of 40

34. Question

An element having the atomic number 17 will resemble which of the following elements having
atomic number as given below?

33
Correct Incorrect Correct answer

35
Correct Incorrect Correct answer

18
Correct Incorrect Correct answer

19
Correct Incorrect Correct answer

Correct

Incorrect
Question 35 of 40

35. Question

A sample of any of the following substances disappears after some time when exposed to air
like camphor, naphthalene, or dry ice. This phenomenon is called?

Sublimation
Correct Incorrect Correct answer

Evaporation
Correct Incorrect Correct answer

Diffusion
Correct Incorrect Correct answer

Radiation
Correct Incorrect Correct answer

Correct

Incorrect
Question 36 of 40

36. Question

The mass of one Avogadro number of helium atoms is?

1.00gram
Correct Incorrect Correct answer

4.00gram
Correct Incorrect Correct answer

8.00gram
Correct Incorrect Correct answer

6.00gram
Correct Incorrect Correct answer

Correct

Incorrect
Question 37 of 40

37. Question

The process or act of extracting a metal from its ore and refining it is called?

Extraction
Correct Incorrect Correct answer

Metal mining
Correct Incorrect Correct answer

Metallurgy
Correct Incorrect Correct answer

Prospecting
Correct Incorrect Correct answer

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Incorrect
Question 38 of 40

38. Question

The atomic weight of nitrogen is?

10
Correct Incorrect Correct answer

12
Correct Incorrect Correct answer

14
Correct Incorrect Correct answer

16
Correct Incorrect Correct answer

Correct

Incorrect
Question 39 of 40

39. Question

What is the IUPAC name for the following compound? HC≡CCH₃

Acetylene
Correct Incorrect Correct answer

Methyl acetylene
Correct Incorrect Correct answer

Butanol
Correct Incorrect Correct answer

Decanoic acid
Correct Incorrect Correct answer

Correct

Incorrect
Question 40 of 40

40. Question

The process by which salt and water reacted in a limited way to form an acid or a base is?

Neutral process
Correct Incorrect Correct answer

Basic acidic process
Correct Incorrect Correct answer

Hydrolysis
Correct Incorrect Correct answer

Sublimation
Correct Incorrect Correct answer

Correct

Incorrect

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