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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.

4,306 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10

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4,306 questions

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Question 1311

jamb 2002

A red precipitate of copper (I) carbide is formed when ammonium solution of copper (I) chloride is introduced into

ACH₃CH₂CH₂CH₃

BCH₂ = CH - CH₂CH₃

CHC≡CH

DCH₃ - C = C - CH₃

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Question 1312

jamb 2002

Ordinary glass is manufactured from silica, CaCO3 and

ANa₂CO₃

BK₂CO₃

CK₂SO₄

DNaHCO₃

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Question 1313

jamb 2002

Which of these pairs are synthetic and natural macromolecules respectively?

AHaemoglobin and nylon, creatine and polyethylene

BNylon and polyethlene, creatine and Haemoglobin

CNylon and creatine, polyethylene and haemoglobin

DCreatine and Polyethylene, nylon and haemoglobin

View Explanation & Discuss

Question 1314

jamb 2002

The number of isomers formed by C\(_6\)H\(_{14}\) is

View Explanation & Discuss

Question 1315

jamb 2002

The reaction of an alkene with hydrogen in the presence of catalyst is

Aa substitution reaction

Ban oxidation reaction

Ca nucleophilic reaction

Dan addition reaction

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Question 1316

jamb 2002

An example of element that can catenate is

Abromine

Bnitrogen

Cchlorine

Dcarbon

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Question 1317

jamb 2002

Which of the following gives a precipitate when treated with NaOH solution?

AAlCl₃

BNH₄CL

CCH₃COONa

DNa₂CO₃

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Question 1318

jamb 2002

Ethanol can easily be produced by

Afermentation of starch

Bdistillation of starch solution

Ccatalytic oxidation of methane

Ddestructive distillation of wood

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Question 1319

jamb 2002

The gas that gives brown colouration in brown ring test is

ANO

BCO₂

CNO₂

DCO

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Question 1320

jamb 2002

Steam changes the colour of anhydrous cobalt (II) chloride from

Ablue to pink

Bwhite to red

Cwhite to green

Dblue to white

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Question 1321

jamb 2002

The property which makes alcohol soluble in water is the

Aboiling point

Bhydrogen bonding

Cionic character

Dcovalent nature

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Question 1322

jamb 2002

The furring of kettles is caused by the presence in the water of?

ACalcium tetraoxosulphate (VI)

BCalcium hydrogentrioxocarbonate (IV)

CCalcium hydroxide

DCalcium trioxocarbonate (IV)

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Question 1323

jamb 2002

The substance least considered as a source of environmental pollution is

ALead compounds

BOrganophosphorous compounds

CSilicate minerals

DUranium

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Question 1324

jamb 2002

25cm\(^3\) of a 0.2 mol dm\(^3\) solution of Na\(_2\)CO\(_3\) requires 20 cm\(^3\) of a solution of HCl for neutralization. The concentration of the HCl solution is

A0.5 mol dm³

B0.6 mol dm³

C0.2 mol dm³

D0.4 mol dm³

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Question 1325

jamb 2002

Three drops of a 1.0 mol dm-3 solution of NaOH are added to 20 cm3 of a solution of pH 8.4. The pH of the resulting solution will?

AClose to that of pure water

BUnaltered

CGreater than 8.4

DLess than 8.4

View Explanation & Discuss

Question 1326

jamb 2002

When a salt loses its water of crystallization to the atmosphere on exposure, the process is said to be

AEfflorescence

BDeliquescence

CEffervescence

DFluorescence

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Question 1327

jamb 2002

Tetraoxosulphate (VI) acid burns the skin by

AHydrolysis

BHydration

CHeating

DDehydration

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Question 1328

jamb 2002

The solubility of a salt of molar mass 101g at 20^oC is 0.34 mol dm^-3. If 3.40g of the salt is dissolved completely in 250cm³ of water in a beaker, the resulting solution is

AA suspension

BSaturated

CUnsaturated

DSupersaturated

View Explanation & Discuss

Question 1329

jamb 2002

The product of the electrolysis of dilute sodium hydroxide using platinum electrodes are

AHydrogen and oxygen gases

BWater and hydrogen gas

CWater and sodium metal

DSodium metal and oxygen gas

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Question 1330

jamb 2002

Cu\(_2\)S(s) + O\(_2\)(g) → 2CU(s) + SO\(_2\)(g)
What is the change in the oxidation number of copper in the reaction above?

A+1 to 0

B0 to +2

C+2 to +1

D0 to +1

View Explanation & Discuss

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