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JAMB Chemistry Questions 2021 Check Randomly Repeated Questions

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Do you want to Study the Jamb chemistry 2021 question ?

In this post am going to share with you JAMB Chemistry Questions 2021 Check Randomly Repeated Questions. 

so if you are going to write Jamb 2022 you need to study this past questions as well as How To Pass Jamb In 202110 Amazing Tips

Read this post till the end and  don’t forget to share this  post to the social media so other 2022 Jamb aspirant can see it and read it.

Visit the Jamb official website to download the Jamb 2021 past Questions  and answers.

SEE ALSO: UNIUYO Admission List 2021/2022 How to Check Admission Status

Below are some randomly repeated questions seen when writing Chemistry in JAMB.

Objective Questions
1. A mixture of iodine and sulphur crystals can be separated by treatment with
A. water of filter off sulphur
B. carbon (1V) sulphide to filter off iodine
C. ethanoic acid to filter off sulphur
D. methanol to filter off iodine

2. Sieving is a technique used to separate mixtures containing solid particles of
A. small sizes
B. large sizes
C. different sizes
D. the same size

3. Which of the compounds is composed of Al, Si, O and H?
A. Epson salt
B. Limestone
C. Clay
D. Urea

4. 50cm3 of carbon (11) oxide was exploded with 150cm3 of air containing 20% oxygen by volume, which of the reactants was in excess?
A. Carbon (11) oxide
B. Carbon (1V) oxide
C. Oxygen

D. Nitrogen

3. Which of the compounds is composed of Al, Si, O and H?
A. Epson salt
B. Limestone
C. Clay
D. Urea

4. 50cm3 of carbon (11) oxide was exploded with 150cm3 of air containing 20% oxygen by volume, which of the reactants was in excess?
A. Carbon (11) oxide
B. Carbon (1V) oxide
C. Oxygen
D. Nitrogen

5. How many moles of HCl will be required to react with potassium heptaoxodichromate (V1) to produce 3 moles of chlorine?
A. 14
B. 12
C. 11
D. 10

6. The ratio of the initial to the final pressure of a given mass of gas is 1:1:5. Calculate the final volume of the gas if the initial volume was 300cm3 at the same temperature.
A. 120 cm3
B. 200 cm3
C. 450 cm3
D. 750 cm3

7. The partial pressure of oxygen in a sample of air is 452mm Hg and the total pressure is 780mmHg. What is the mole fraction of oxygen?
A. 0.203
B. 0.579
C. 2.030
D. 5.790

More Questions

8. The fundamental difference between the three states of matter is the
A. shape of their particles
B. number of particles in each state
C. shape of the container they occupy
D. degree of movement of their particles

9. Which of the following statements is correct about the periodic table?
A. Element in the same period have the same number of valence electrons
B. The valence electrons of the elements in the same period increase progressively across
the period
C. Elements in the same group have the number of electron shells
D. The non-metallic properties of the elements tend to decrease across each period.

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10. The electron configuration of 22X2+ ion is
A. ls2 2s2 2p6 3s2 3p6 4s2 3d2
B. ls2 2s2 2p6 3s2 3p6 4s2 3d1
C. ls2 2s2 2p6 3s2 3p6
D. ls2 2s2 2p6 3s2 3p6 4p2

11. Which of the following types of bonding does not involve the formation of a new substance?

A. Metallic
B. Covalent
C. Co-ordinate
D. Electrovalent

12. The knowledge of half-life can be used to
A. create an element
B. detect an element
C. split an element
D. irradiate an element

13. The shape of CO2H2O and CH4 respectively are
A. bent linear and tetrahedral
B. bent tetrahedral and linear
C. linear bent and tetrahedral
D. tetrahedral, linear and bent.

14. The distance between the nuclei of chlorine atoms in a chlorine molecule is 0.914 nm. The atomic radius of the chlorine atom is
A. 0.097 nm
B. 0.914 nm
C. 2.388 nm
D. 2.388 nm

More Questions

15. The noble gas, argon, is used for
A. electric are welding
B. welding brass
C. underwater welding
D. steel welding

16. A side effect of soft water is that
A. it gives an offensive taste
B. excess calciums precipitate
C. it attacks lead contained in pipes
D. it encourages the growth of bacteria

17 Water molecules can be ligands especially when they are bonded to.
A. alkaline earth metals
B. alkali metals
C. transition metals
D. group V11 elements

18. The air pollutant unknown in nature is

19. 10dm3 of distilled water used to wash 2.0 g of a precipitate of AgCl. If the solubility product of AgCl is 2.0 x10-10 mol dm-6, what quantity of silver was lost in the process?
A. 2.029 x10-3  mol dm-3
B. 1.414 x 10-3 mol dm-3
C. 2.029 x 10-5 mol dm-3
D. 1.414 x 10-5 mol dm-3

20. Hydration of ions in solution is associated with
A. absorption of heat
B. reduction of heat
C. conduction of heat
D. liberation of heat

21. In which order are the following salts sensitive to light?
A. Agl ›AgCl ›AgBr
B. AgCl ›Agl ›AgBr
C. AgBr ›AgCl ›AgI
D. AgCl ›AgBr ›AgI

Continue Reading

23. Thee pOH of a solution of 0.25 mol dm-3  of hydrochloric acid is
A. 12.40
B. 13.40
C. 14.40
D. 14.60.

24. For a reaction in equilibrium, the species involved in the equilibrium constant expression are
A. gaseous and solid species
B. liquid and solid species
C. solid and dissolved species
D. gaseous and dissolved species

25. A phenomenon where an element exists in different forms in the same physical state is known as
A. isomerism
B. amorphism
C. allotropy
D. isotropy

26. The substance often used for the vulcanization of rubber is
A. chlorine
B. hydrogen peroxide
C. sulphur
D. tetraoxosulphate (V1) acid

27. A gas that is not associated with global warming is
A. CO2
B. SO3
C. CH4
D. H2

28. The refreshing and characteristics taste of soda water and other soft drinks is as a result of the presence in them of
A. carbon(1V)oxide
B. carbon(11) oxide
C. soda
D. glucose

29. A form of carbon used for absorbing poisonous gases and purification of noble gases is
A. wood charcoal’
B. animal charcoal
C. carbon fibres
D. carbon black.

30. Synthetic gas is a mixture of
A. CH4 and H2O
B. CH4 and H2
C. CO2 and H2
D. CO and H2

JAMB Chemistry Questions Today and Answers

1:- the element with an electron configuration 1s2 2s2 2p6 3s23p64s2
CORRECT ANSWER = a noble gas

2:- ethanoic acid is monobasic because its
CORRECT ANSWER = has one replaceable hydrogen molecule

3:- the type of bond in nitrogen molecule is

4:- in the hydrogenation of benzene, the catalyst used is

5:- the acid found in sour milk is
CORRECT ANSWER = lactic acid

6:- transition metals with a higher oxidation state will form oxides that are

7:- the IUPAC nomenclature of the compound above is
CORRECT ANSWER = pent-2-yne

8:- in the diagram above X is

9:- if 200cm3 of oxygen passes through a porous plug in 100sec.find the time taken for the same volume of hydrogen to pass through the same porous plug

10:- the method used in purifying sugar is
CORRECT ANSWER = crystallization


11:- the activation energy of a chemical reaction can be lowered by

CORRECT ANSWER = the addition of a catalyst

More Questions and Answers

12:- in the equation above X is

13:- a solubility curve is a plot of the solubility of a solute against

14:- the method that is not economical for the removal of hardness in water for town supply is

15:- in the electrolytic extraction of sodium from fused sodium chloride calcium chloride is usually added to
CORRECT ANSWER = remove impurities

16:- grades of petrol having octane number nearer zero will cause a motor car engine to ‘

17:- nickel is plated on steel to
CORRECT ANSWER = increase its strength

18:- the solubility in mol/dm3 of 20.2g of potassium trioxonitrate(V)dissolved in 100g of water at room temperature is

19:- what is the atomic number of an element having 127 neutrons and 82 electrons

20:- 28.80CM3 OF NITROGEN AT 15c is cooled to 0C. Its value at constant pressure is

21:- what physical property of alkane decreases as the number of carbon atoms increases
CORRECT ANSWER = solubility

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22:- which of the following substances are made by polymerization
CORRECT ANSWER = nylon and artificial rubber

23:- which of the following compounds is unsaturated
CORRECT ANSWER = ethylbenzene

24:- a compound contains 31.9% potassium 28.93 chlorine and the remaining oxygen. What is the chemical formula of the compound?

25:- the use of neon light in aerodrome beacons is due to its

26:- K4Fe(CN)6 is an example of a

27:- if T change in s is small relative to a change in H at room temperature the value of change in G will be

28:- the solubility of alkanols in water is due to the presence of
CORRECT ANSWER = hydroxyl group

29:- when the lubricating oil is redistilled, it yields
CORRECT ANSWER = petroleum jelly

30:- the IUPAC nomenclature of K2Cr2O7 SI
CORRECT ANSWER = potassium heptaoxodichromate(VI)

Continue Reading

CORRECT ANSWER = carbon content

32:- ozone is known for its ability to
CORRECT ANSWER = attack the respiratory tract of organisms

33:- which of the following properties is peculiar to graphite?
CORRECT ANSWER = it is unreactive

34:- calculate the amount in moles of zinc that will be deposited by passing 10 faradays of electricity through a solution of zinc salt

35:- the air pollutant that dissolves in water due to produce acid rain is

36:- the property peculiar to pure oxygen is that it
CORRECT ANSWER = is lighter than air

37:- the principal property that determines the method of extraction of a metal from its ore is its
CORRECT ANSWER = position in the activity series

38:- when water is added to calcium oxide, it forms
CORRECT ANSWER = calcium hydroxide

39:- in the reaction above, the reverse reaction can be favoured by
CORRECT ANSWER = decreases the temperature

40:- an element with electron configuration 1s2 2s2 2p6 3s2 3p4 belongs to the

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