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Chemistry Past Questions

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1,623 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10

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1,623 questions

Question 1 of 20 1,623 total questions

Question 271

waec 2015

The following transition metal ions would be coloured in aqueous solution except________?

ACr³⁺

BFe³⁺

CMn³⁺

DSc³⁺

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Question 272

waec 2015

Which of the following pairs of compounds belongs to the same homologous series?

AC₃H₈ and C₃H₆

BC₄H₁₀ and C₅H₁₀

CC₂H₄ and C₄H₁₀

DC₂H₆ and C₄H₁₀

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Question 273

waec 2015

Which of the following pairs of elements forms amphoteric oxides?

ABe and Mg

BNa and K

CB and Al

DSi and Pb

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Question 274

waec 2015

A metallic ion Z\(^{2+}\) with an inert gas structure contains 18 electrons. How many protons are contained in this ion?

A20

B18

C16

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Question 275

waec 2015

The shape of a molecule of water is _______?

ANon-linear

BOctahedral

CPyramidal

DTetrahedral

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Question 276

waec 2015

The compound formed between ₁₄X and ₁₆Y is _______?

AXY

BXY₂

CX₂Y

DX₄Y₆

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Question 277

waec 2015

The Van der waals' forces are dominant intermolecular forces in_______?

AAmmonium chloride

BChlorine

CSodium chloride

DWater

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Question 278

waec 2015

How many orbits are contained in an atom with atomic number 13?

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Question 279

waec 2015

The negatively charged particle in an atom is the

AElectron

BNeutron

CPositron

DProton

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Question 280

waec 2014

The oxide from electric power station is

Acarbon (IV) oxide

Bcopper (ll) oxide

Cnitrogen (IV) oxide

Dsulphur (IV) oxide

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Question 281

waec 2014

The most common process in the extraction of metals from their ore is

Acatalysis

Belectrolysis

Coxidation

Dreduction

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Question 282

waec 2014

Which of the following gases is used to retard the vaporization of the filament in a light bulb?

AArgon

BHelium

CHydrogen

DOxygen

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Question 283

waec 2014

The purity of a solid sample can best be determined by its?

Aboiling point

Bmelting point

Cconductivity

Dsolubility

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Question 284

waec 2014

The production of biogas from the fermentation of waste materials is an example of

Acombustion

Bincineration

Crefining

Drecycling

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Question 285

waec 2014

Which of the following organic compounds could be represented by the empirical formula CH₂O?

AEthanal

BEthane

CEthanol

DEthanoic acid

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Question 286

waec 2014

Consider the reaction represented by the following equation: C₂H_4(g)
+ 30_2(g) → 2CO_2(g) + 2H₂O_(g)How many moles of ethene would be burnt to produce 0.1 mole of water?

A0.05 mole

B0.10 mole

C0.20 mole

D2.00 moles

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Question 287

waec 2014

The liquid hydrocarbon likely to be found in the fraction of crude oil used for domestic cooking is?

AC₃H₈

BC ₅H ₁₂

CC₁₃H₂₈

DC₂₀H₄₂

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Question 288

waec 2014

A colourless hydrocarbon with a sweet smell undergoes substitution reaction. The hydrocarbon is likely to be

Aalkanol

Bbenzene

Cester

Dmethane

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Question 289

waec 2014

The enzyme that catalyses the conversion of glucose te ethanol and carbon (IV) oxide is

Adiastase

Bmaltase

Cptyalin

Dzymase

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Question 290

waec 2014

The IUPAC name of the following organic compound is HOOC - COOH

Aethan - 1, 2 -dioc acid

Bethanoic acid

Coxalic acid

Dpropan - 1,2-dioic acid

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