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Chemistry Past Questions

Study and practice Chemistry past questions with answers and detailed explanations. Then test your knowledge using our interactive CBT practice platform and prepare confidently for your upcoming examinations.

45 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10

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Past Questions

45 questions

Question 1 of 20 45 total questions

Question 1

jamb 1984

The I.U.P.A.C name for the compound is

Aisopropylethene

Bacetylene

C3- methylbutane

D2-methylbutane

E5-methylpentane

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Question 2

jamb 1984

Use the diagram above to answer this question
Which of the following structural formula is NOT isomeric with the others?

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Question 3

jamb 1984

USE THE DIAGRAM ABOVE TO ANSWER THIS QUESTION.
Which of the following represents a carboxylic acid?

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Question 4

jamb 1984

The name of the compound above is

Aacetic acid

Bpropanal

Cpropanol

Dethanoic acid

Epropanoic acid

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Question 5

jamb 1984

The diagram above (Fig.3) shows the energy profile for the reaction A + B + = C + D From this diagram, it is clear that the reaction is

Aspontaneous

Bisothermal

Cadiabatic

Dexothermic

Eendothermic

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Question 6

jamb 1984

Which of the curves shown in the figure given represents the relationships between the volume(V) and pressure(P) of an ideal gas at constant temperature

E1 and 3

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Question 7

jamb 1984

The solubility curves of four substances are shown in the figure above. Which of the four substances would crystallize from a saturated solution cooled from 353K(80^oC)to 323K(50C)?

AP and Q

BP and R

CP and S

DR and S

EQ and R

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Question 8

jamb 1984

At S. T. P how many litres of hydrogen can be obtained from the reaction of 500 cm\(^3\) of 0.5 M H\(_2\)SO\(_4\) with excess zinc metal?
(Gram molecular volume of H\(_2\) = 22.4 dm\(^3\))

A22.4 dm ³

B11 . 2 dm ³

C6. 5 dm ³

D5. 6 dm ³

E0. 00 dm ³

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Question 9

jamb 1984

An aqueous solution of a metal salt, M, gives a white precipitate with NaOH which dissolves in excess NaOH. With aqueous ammonia, the solution of M also gives a white precipitate which dissolves in excess ammonia. Therefore cartion in M is

AZn ⁺⁺

BCa⁺⁺

CAi⁺⁺⁺

DPb⁺⁺

ECu⁺⁺

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Question 10

jamb 1984

Which of the following electrodes is used in electrolysis of bauxite (Al₂O₃) in molten cryolite?

ASteel electrodes

BCarbon electrodes

CMercury electrodes

DCarbon anode and steel cathode

ECarbon cathode and stell anode

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Question 11

jamb 1984

A piece of sea shell, when dropped into a dilute solution of hydrochloric acid, produces a colourless, odourless gas which turns clear limewater milky. The sea shell contains

Asodium chloride

Bammonium nitrate

Ccalcium carbonate

Dcalcium chloride

Emagnesium chloride

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Question 12

jamb 1984

The function of conc. H₂SO₄ in the esterification of ethanoic acid with ethanol is to

Aserve as a dehydrating agent

Bserve as a solvent

Cact as a catalyst

Dprevent any side reaction

Eserve as an oxidizing agent

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Question 13

jamb 1984

If an excess of a liquid hydrocarbon is poured into a jar of chlorine, and the sealed jar is then exposed for several hours to bring sunlight, all the chlorine gas is consumed. The hydrocarbon is said to have undergone

Aa polymerization reaction

Ban isomerization reaction

Can addition reaction

Da substitution reaction

Ea reduction reaction

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Question 14

jamb 1984

Alkanes

Aare all gases

Bhave the general formula C_nH_2n + ₂O

Ccontain only carbon and hydrogen

Dare usually soluble in water

Eare usually active compounds

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Question 15

jamb 1984

Sodium hydroxide (NaOH) pellets are

Adeliquescent

Bhygroscopic

Cefflorescent

Dhydrated

Efluorescent

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Question 16

jamb 1984

Water is said to be 'hard' if it

Aeasily forms ice

Bhas to be warmed before sodium chloride dissolves in it

Cfroms an insoluble scum with soap

Dcontains nitrates

Econtains sodium ions

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Question 17

jamb 1984

Nitrogen can best be obtained from a mixture over oxygen and nitrogen by passing the mixture over

Apotassium hydroxide

Bheated gold

Cheated magnesium

Dheated phosphorus

Ecalcium chloride

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Question 18

jamb 1984

If the cost of electricity required to deposit 1 g of magnesium is N5.00, how much would it cost to deposit 10g of aluminium?

AN 10.00

BN27.00

CN44.44

DN66.67

EN33.33

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Question 19

jamb 1984

Which of the following statements is NOT correct about all four of the acids: HBr, HNO₃, H ₂CO₃ and H₂SO₄? They

Adissolve marble to liberate CO

Bhave a PH less than 7

CTurn blue litmus red

Dneutralize alkalis to form salt

Ereact with magnesium to liberate hydrogen

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Question 20

jamb 1984

Which of the following statements is INCORRECT?

AFractional distillation of crude petroleum will give the folloing hydrocarbon fuels in order of increasing boiling point

BButane < petrol < kerosene of polythene.

CBoth but-1-ene and but-1-yne will decolorize bromine readily

Dbut-2-ene will react with chlorine to form 2,3-dichlorobutane

Ecalcuim carbide will react with water to form any alkyne

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