JAMB 2018 Chemistry CBT Possible 59 Questions

The Joint Admission and Matriculation Board, JAMB Chemistry Possible CBT questions. 

We will be providing the possible random questions that has been asked severally in JAMB Chemistry CBT Examination. Its vital to note that these questions were asked too during the Jamb mock examination.
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We want you to carefully take your pen, solve these questions and pay attention to these questions as they might be repeated in your examination. Please note, This is not an expo.. Its just a guide to help you brace your JAMB CHEMISTRY EXAMINATION ahead..

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JAMB 2018 Chemistry CBT Possible Questions

1. Sodium chloride may be obtained from brine by A. titration B. decantation C. distillation D. evaporation E. sublimation.

2. 20cm3 of hydrogen gas are sparked with 20cm3 of oxygen gas in an eudiometer at 373K (100oC) and 1 at atmosphere. The resulting mixture is cooled to 298 K (25oC) and passed over calcium chloride. The volume of the residual gas is A. 40cm3 B. 20cm3 C. 30cm3 D. 10cm3 E. 5 cm3.

3. Which of the following conducts electricity? A. Sulphur B. Graphite C. Diamond D. Red phosphorus E. Yellow phosphorus.

4. An organic compound contains 72% carbon 12% hydrogen and 16% oxygen by mass. The empirical formula of the compound is A. C6H22O3 B. C6H10O3 C. C12H12O D. C6H12O E. C3CH10 ( H= 1, C = 12, O= 16).

5. 0.499 of CuSO4.xH2O when heated to constant weight gave a residue of 0.346 g. The value of x is A. 0.5 B. 2.0 C. 3.0 D. 4.0 E. 5.0. (Cu = 63.5, S = 32.0 O = 16, H = 1).

6. Hydrogen diffuses through a porous plug A. at the same rate as oxygen B. at a slower rare than oxygen C. twice as fast as oxygen D. three times as fast as oxygen E. four times as fast as oxygen.

7. If the molar mass of X is 36 g, the number of moles of X dissolved at 343 is A. 0.2 moles B. 0.7 moles C. 1.5 moles D. 2.0 moles E. 3.0 moles.

8. Hydrogen diffuses through a porous plug A. at the same rate as oxygen B. at a slower rare than oxygen C. twice as fast as oxygen D. three times as fast as oxygen E. four times as fast as oxygen.

9. A certain volume of a gas at 298K is heated such that its volume and pressure are now four times the original values. What is the new temperature? A. 18.6 K B. 100.0 K C. 298.0 K D. 1192.0 K E. 47689.0 K.

10. A correct electrochemical series can be obtained from K, Na, Ca, Al, Mg, Zn, Fe, Pb, H, Cu, Hg, Ag, Au by interchanging A. Al and Mg B. Zn and Fe C. Zn and Pb D. Pb and H E. Au and Hg.

11. The boiling points of water, ethanol, toluene and button-2-ol are 373.OK, 351.3K, 383.6 K and 372.5 K respectively. Which liquid has the highest vapour pressure at 323.0K? A. water B. Toluene C. Ethanol D. Butan-2-ol E. None.

12. 2MnO4- + 10Cl- + 16H + ’! 2Mn2+ + 5Cl2 + 8H2O. which of the substances serves as an oxidizing agent? A. Mn2+ B. ClC. H2O D. MnO4 E. Cl2.

13. which of the following metals will displace iron from a solution of iron(11) tetraoxosulphate(1V)? A. copper B. mercury C. silver D. Zinc E. Gold.

14. Complete hydrogenation of ethyne yields A. benzene B. methane C. ethene D. propane E. Ethane.

15. What is the formula of sodium gallate if gallium (Ga) shows an oxidation number of +3. A. NaGaO3 B. Na2G(OH)2 C. NaGa(OH)3 D. NaGa (OH)4 E. NaGaO.

16. Complete hydrogenation of ethyne yields A. benzene B. methane C. ethene D. propane E. Ethane.

17. Which of the following is used in the manufacture of bleaching powder? A. sulphur dioxide B. chlorine C. hydrogen tetraoxosulphate D. hydrogen sulphide E. nitrogen dioxide.

18. Tetraoxosulphate (V1) ions are finally tested using A. acidified silver nitrate B. acidified barium chloride C. lime – water D. dilute hydrochloric acid E. acidified lead nitrate.

19. Mixing of aqueous solution of barium hydroxide and sodium tetraoxocarbonate(1V) yields a white precipitate of A. barium oxide B. sodium tetraoxocarbonate(1V) C. sodium, oxide D. sodium hydroxide E. barium tetraoxocarbonate.

20. An organic compound decolorized acidified KMnC4 solution but failed to react with ammoniacal silver nitrate solution. The organic compound is likely to be. A. a carbonxyllic acicd B. an alkane C. an alkene D. an alkyne E. an alkanone.

21. Solid sodium hydroxide on exposure to air absorbs a gas and ultimately gives another alkaline substance with the molecular formula. A. NaOH.H2O B. NaOH.N2 C. Na2CO3 D. NaHCO3 E. NaNO3.

22. The neutralization reaction between NaOH solution and nitrogen (1V) oxide (NO2) produces water and A. NaNO2 and NaNO3 B. NaNO3 and HNO3 C. NaNO2 D. NaNO3 E. NaN2O3.

23. Which of the following substances is the most abundant in the universe? A. Carbon B. Air C. Water D. Oxygen E. Hydrogen.

24. Addition of dilute hydrochloric acid to an aqueous solution of a crystalline salt yielded a yellow precipitate and a gas which turned dichromate paper green. The crystalline salt was probably A. Na2SO4 B. Na2S C. NaS2O3.5H2O D. NaCO3 E. NaHCO3.

25. The process involved in the conversion of an oil into margarine is known as A. hydrogenation B. condensation C. hydrolysis D. dehydration E. cracking.

26. Compound X is A. an alkene B. an alkane C. an alkyne D. tetra chloromethane E. Dichloromethane.
27. Which of the following roles does sodium chloride play in soap preparation? It A. reacts with glycerol B. purifies the soap C. accelerates the decomposition of the fat and oil D. separates the soap form the glycerol E. converts the fat acid to its sodium salt.

28. The atomic number of an element whose caution, X2+, has the ground state electronic configuration is Is22s22P63s22p6 is A. 16 B. 18 C. 20 D. 22 E. 24.

29. Which of the following sulphides is insoluble in dilute HCl? A. Na2S B. ZnS C. CuS D. FeS.

30. When chlorine is passes into water and subsequently exposed to sunlight, the gas evolved is A. HCl B. HOCl C. O2 D. Cl2O2.

31. Which of the following compounds would give lilac fame coloration and a white precipitate with acidified barium chloride solution? A. KCl B. NaNO3 C. K2SO D. CaSO4.

32. When ethanol is heated with excess concentrated sulphuric acid, the ethanol is A. oxidized to ethene B. polymerized to polyethene C. dehydrated to ethene D. dehydrated to ethyne.

33. How will a metal X, which reacts explosively with air and with dilute acids be best extracted from its ores? A. Electrolysis of the solution of its salt B. Decomposition of its oxide C. Displacement from solution by an alkali metal D. Electrolysis of fused salt.

34. Which of the following are made by the process of polymerization? A. Nylon and soap B. Nylon and rubber C. Soap and butaneD. Margarine and Nylon.

35. Which of the following is used as an‘anti-knock’ in automobile engines? A. Tetramethyl silane B. Lead tetra-ethyl C. Glycerol D. N-heptanes.

36. Starch can converted to ethyl alcohol by A. distillation B. fermentation C. isomerization D. cracking.

37. What reaction takes place when palm-oil is added to potash and foams are observed? A. Neutralization B. Saponification C. Etherification D. Salting-out.

38. In the purification of town water supply, alum is used principally to . A. kill bacteria B. control the pH of water C. improve the taste of the water D. coagulate small particles of mud.

39. Oil spillage in ponds and creeks can be cleaned up by A. burning off the oil layer B. spraying with detergent C. dispersal with compressed air D. spraying with hot water.

40. Which of the following substances has the lowest vapour density? A. Ethanoic acid B. Propanol C. Dichlomethane D. Ethanal [O = 16, Cl = 35.5, H =1, C = 12].

41. In which of the following pairs of elements is allotropy exhibited by each element? A. Phosphorus and hydrogen B. Oxygen and chlorine C. Sulphur and nitrogen D. Oxygen and sulphur.

42. ethanol reacts with aqueous sodium mono-oxoio date(1) to gives a bright yellow solid with a characteristic smell. The products is A. trichlomethane B. ftriiodomethane C. iodoethane D. ethanol

43. Stainless steel is an alloy of A. iron, carbon and silver B. ironm carbon and lead C. iron, carbon and chromium D. iron and carbon only.

44. Corrosion is exhibited by. A. iron only B. electropositive metals C. metals below hydrogen in the electrochemical series D. all metals.

45. Some products of destructive distillation of coal are A. carbon (iV) oxide and ethanoic acid B. trioxocarbonate (lV) acid and methanoic acid C. producer gas and water gas D. coke and ammonia liquor.

46. Gunpowder is made from charcoal, sulphur and potassium trioxonirate (V). The salt in the mixture performs the function of A. an oxidant B. a reductant C. a solvent D. a catalyst.

47. The reaction between ethanoic acid and sodium hydroxide is an example of A. esterification B. neutralization C. hydrosylation D. hydrolysis.
48. The bond which joins two ethanoic acid molecules in the liquid state is A. a covalent bond B. an ionic bond C. a dative covalent bond D. a hydrogen bond.

49. The product of the thermal decomposition of ammonium trioxonirate (V) are. A. NO2 and oxygen B. NH3 and oxygen C. nitrogen and water D. N2O and water.

50. The alkaline hydrolysis of fats and oils produces soap and A. propane 1, 1, 3-triol B. propane – 1, 3, 3-triol C. propane-1-2-2-triol D. propane-1-2-3-triol.

51. A metal is extracted for, its ore by the electrolysis of tits molten chlorine and it displace lead from lead (ll) trioxonirate(V) solution. The metal is A. copper B. aluminium C. zinc D. sodium.

52. Which of the following is a physical change?
53. The bubbling of chlorine into water B. The bubbling of chlorine into jar containing hydrogen C. The dissolution of sodium chlorine in water D. The passing of steam over heated iron.

54. Which of the following terms indicates the number of bonds that can be formed by atom? A. Oxidation number B. Valence C. Atomic number D. Electronegativity.

55. The effluent of an industrial plant used ins the electrolysis of concentrated brine, with a flowing mercury cathode may contain impurities like. A. oxygen B. hydrogen C. mercury (ll) chloride D. hydrogen chloride.

56. Smoke consists of A. solid particles dispersed in liquid B. solid or liquid particles dispersed in gas C. gas or liquid particles dispersed in liquid D. liquid particles dispersed in liquid.

57. Which of the following gases can be collected by upward displacement of air? A. NO B. H2 C. NH3 D. Cl2.

58. The label on a reagent bottle containing a clear organic liquid dropped off. The liquid was neutral to litmus and gave a colourless gas with metallic sodium. The liquid must be an A. alkanoate B. alkene C. alkanol D. alkane.

59. The major component of the slag from the production of iron is A. an alloy of calcium and iron B. coke C. impure ion E. calcium trioxosilicate (V).

UPDATED...

The following are likely 2018 Jamb Questions and Answers on Chemistry. Practice these 2018 Jamb Questions and Answers before you enter for your Exam.



CHEMISTRY LIKELY QUESTIONS FOR JAMB 2018 CBT EXAM.
QUESTION 1

Air boiled out of water as steam is richer in

(A) nitrogen and oxygen

(B) carbon(iv)oxide and oxygen

(C) noble gases and carbon(iv)oxide

(D) oxygen and noble gases

QUESTION 2

Which of the following is an example of a mixture?

(A) common salt

(B) blood

(C) sand

(D) washing soda

QUESTION 3

Calculate the percentage by mass of nitrogen in calcium trioxonitrate (V) [Ca=40, N=14, O=16]

(A) 8.5%

(B) 13.1%

(C) 17.1%

(D) 27.6%

QUESTION 4

The droplets of water observed around a bottle of milk taken out of the refrigerator is due to the fact that the

(A) water vapour in the air around the bottle gains some energy from the bottle

(B) temperature of the milk drops as it loses heat into the surroundings

(C) saturated vapour pressure of the milk is equal to the atmospheric pressure

(D) water vapour in the air around the bottle loses some of its energy to the bottle

QUESTION 5

The volume of a given gas is V cm3 at P mm Hg. What is the new volume of the gas if the pressure is reduced to half at constant temperature?

(A) 4V cm2

(B) 2V cm3

(C) v/2 cm2

(D) V cm3

QUESTION 6

Moving from left to right across a period, the general rise in the first ionization energy can be attributed to the

(A) decrease in nuclear charge

(B) increase in nuclear charge

(C) decrease in screening effect

(D) increase in screening effect

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QUESTION 7

How many unpaired electron(s) are there in the

(A) 3

(B) 2

(C) 1

(D) 0

QUESTION 8

The stability of the noble gases is due to the fact that they

(A) have no electron in their outermost shells

(B) have duplet or octet electron configurations

(C) belong to group zero of the periodic table

(D) are volatile in nature

QUESTION 9

The maximum number of electrons in the L shell of an atom is

(A) 2

(B) 8

(C) 18

(D) 32

QUESTION 10

Elements in the same period in the periodic table have the same

(A) number of shells

(B) atomic number

(C) chemical properties

(D) physical properties

QUESTION 11

In the course of purifying water for town supply ,the water is passed through large settling tanks containing sodium aluminate (iii) to remove

(A) large particles

(B) germs

(C) fine particles

(D) odour

QUESTION 12

A noble gas with a high power of fog penetration used in aerodrome beacons is

(A) krypton

(B) argon

(C) helium

(D) neon

QUESTION 13

Permanent hardness of water can be removed by

(A) filtration

(B) adding slaked lime

(C) adding caustin soda

(D) boiling

QUESTION 14

Substances employed as drying agents are usually

(A) ampohoteric

(B) hygroscopic

(C) efflorescent

(D) acidic

QUESTION 15

Calculate the solubility in mol dm-3 of 40g of cuSo4 [Cu = 64, S=32, O=16]

(A) 400

(B) 2.50

(C) 0.40

(D) 0.25

QUESTION 16

Coffee stains can best be removed by

(A) kerosene

(B) turpentine

(C) a solution of borax in water

(D) ammonia solution

QUESTION 17

Carbon (II) oxide is considered dangerous if inhaled mainly because it

(A) can cause injury to the nervous system

(B) competes with oxygen in the blood

(C) competes with carbon (IV) oxide in the blood

(D) can cause lung cancer

2018 Jamb Questions and Answers on Chemistry

QUESTION 18

The acid that is used to remove rust is

(A) boric

(B) hydrochloric

(C) trioxonitrate (V)

(D) tetraoxosulphate (VI)

QUESTION 19

Calculate the volume of 0.5 mol dm-3 H2SO4 that is neutrialized by 25cm3 of 0.1 mol dm-3 NaOH.

(A) 5.0cm3

(B) 2.5cm3

(C) 0.4cm3

(D) 0.1cm3

QUESTION 20

The colour of methyl orange in alkaline mediums is

(A) yellow

(B) pink

(C) orange

(D) red

QUESTION 21

Which of the following salts is slightly soluble in water?

(A) AgCI

(B) CaSO4

(C) Na2CO3

(D) PbCl2

QUESTION 22

6AgNO3(aq) + PH3(g) + 3H2O(l)->6Ag(s) + H3PO3(aq) + 6HNO(3aq) . In the reaction above, the reducing agent is

(A) HNO3(aq)

(B) H2O(l)

(C) PH3(g)

(D) AgNO3(aq)

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QUESTION 23

The IUPAC nomenclature of the compound LiAIH is

(A) lithium tetrahydridoaluminate (III)

(B) aluminium tetrahydrido lithium

(C) tetrahydrido lithium aluminate (III)

(D) lithium aluminium hydride

QUESTION 24

Iron can be protected from corrosion by coasting the surface with

(A) gold

(B) silver

(C) copper

(D) zinc

QUESTION 25

What quantity of aluminium is deposited when a current of 10A is passed through a solution of an aluminium salt for 1930s?

[Al = 27, F = 96 500 C. mol-1]

(A) 0.2g

(B) 1.8g

(C) 5.4g

(D) 14.2g

QUESTION 26

In which of the following is the entropy change positive?

(A) thermal dissociation of ammonium chloride

(B) Reaction between an acid and a base

(C) addition of concentrated acid to water

(D) dissolution of sodium metal in water

QUESTION 27

The colour of methyl orange in alkaline mediums is

(A) yellow

(B) pink

(C) orange

(D) red

QUESTION 28

In the preparation of oxygen by heating KCIO in the presence of MnO2, only moderate heat is needed because the catalyst acts by

(A) lowering the pressure of the reaction

(B) increasing the surface area of the reactant

(C) increasing the rate of the reaction

(D) lowering the energy barrier of the reaction

QUESTION 29

To a solution of an unknown compound, a little dilute tetraoxosulphate (VI) acid was added with some freshly prepared iron (II) tetraoxosulphate (VI) solution. The brown ring observed after the addition of a stream of concentrated teraoxosulphate (VI) acid confirmed the presence of

(A) CO

(B) CI-

(C) SO-

(D) NO

QUESTION 30

Which of the following is used as a rocket fuel?

(A) HNO3

(B) CH3COOH

(C) H2SO4

(D) HCI

QUESTION 31

A constituent common to bronze and solder is

(A) lead

(B) silver

(C) Copper

(D) tin

QUESTION 32

When iron is exposed to moist air, it gradually rusts. This is due to the formation of

(A) hydrated iron (III) oxide

(B) anhydrous iron (III) oxide

(C) anhydrous iron (II) oxide

(D) hydrated iron (II) oxide

QUESTION 33

A compound gives an orange-red colour to a non-luminous flame. This compound is likely to contain

(A) Na+

(B) Ca2+

(C) Fe3+

(D) Fe2+

QUESTION 34

Stainless steel is used for making

(A) magnets

(B) tools

(C) coins and medals

(D) moving parts of clocks

QUESTION 35

The residual solids from the fractional distillation of petroleum are used as

(A) coatings for pipes

(B) raw materials for the cracking process

(C) fuel for driving tractors

(D) fuel for jet engines

QUESTION 36

Which of the following is used as fuel in miners lamp?

(A) Ethanal

(B) Ethyne

(C) Ethene

(D) Ethane

QUESTION 37

Which of the following organic compounds is very soluble in water?

(A) CH2COOH

(B) C2H2

(C) C2H4

(D) CH3COOC2H5

QUESTION 38

Benzene reacts with hydrogen in the presence of nickel catalyst at 180oC to give

(A) xylene

(B) toluene

(C) cyclopentane

(D) cyclohexane

QUESTION 39

Which of the following is used to hasten the ripening of fruits?

(A) Ethene

(B) Ethanol

(C) Ethyne

(D) Ethane

QUESTION 40

The final products of the reaction between methane and chlorine in the presence of ultraviolet light are hydrogen chloride and

(A) tricholoromethane

(B) dichloromethane

(C) tetrachioromethane

(D) chloromethane

QUESTION 41

One of the major uses of alkanes is

(A) as domestic and industrial fuels

(B) in the hydrogenation of oils

(C) in the textile industries

(D) in the production of plastics.

QUESTION 42

The haloalkanes used in the dry-cleaning industries are

(A) trichloromethane and tetrachloromethane

(B) chloroethene and dichloroethane

(C) trichoroethene and tetrachloroethane

(D) chloroethane and dichloroethene

QUESTION 43

Two hydrocarbons X and Y were treated with bromine water. X decolorized the solution and Y did not. Which class of compound does Y belong?

(A) Benzene

(B) Alkynes

(C) Alkenes

(D) Alkanes

QUESTION 44

The compound that is used as an anaesthetic is

(A) CCI2

(B) BHCI3

(C) Ch2CI2

(D) CH2CI

QUESTION 45

when a few drops of water is added to a blue anhydrous cobalt (ii) chloride ,the colour changes to

(A) white

(B) pink

(C) red

(D) blue

QUESTION 46

the vulcanizers solution is prepared by dissolving rubber in

(A) ethanol

(B) kerosene

(C) benzene

(D) petrol

QUESTION 47

117.0 g of sodium chloride was dissolved in 1.0 dm3 of distilled water at 25oc .Determine the solubility in mol dm-3 of sodium chloride at that temperature[Na=23,Cl=35.5]

(A) 1.0

(B) 2.0

(C) 3.0

(D) 4.0


QUESTION 48

The uncovered raw food that is sold along major roads is likely to contain some amounts of

(A) Pb

(B) Cu

(C) Ag

(D) Na

QUESTION 49

what is the PH of a 0.001 mol dm-3 solution of sodium hydroxide?

(A) 14

(B) 13

(C) 12

(D) 11

QUESTION 50

The basicity of CH3COOH is

(A) 1

(B) 2

(C) 3

(D) 4



ANSWERS

1 2b 3c 4d 5b 6b 7a 8b 9b 10a 11c 12a 13c 14b

15b 16d 17b 18d 19b 20a 21c 22c 23d 24d 25b



26a 27c 28d 29d 30b 31d 32a 33b 34c 35a 36b



37a 38d 39a 40c 41a 42c 43d 44b 45b 46c 47b 48a 49d 50a


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