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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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Past Questions

4,306 questions
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Question 1 of 20 4,306 total questions
Question 1181
waec 2004
A solution of zinc chloride should not be stored in a container made of
Atin
Bcopper
Caluminium
Dlead
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Question 1182
waec 2004

Two solutions containing Pb2+ and AI3+ respectively can be distinguished using

ANaOH(aq)
BNH3(aq)
Cconc. HCI3
Dconc. HCI
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Question 1183
waec 2004
What quantity of electrons in moles is needed to discharge two moles of aluminum from aluminum oxide (AI 2O3)
A1
B2
C4
D6
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Question 1184
waec 2004
Which of the following subtances will not produce effervescence with dilute hydeochloric acid?
ACopper (ll) trioxocarbonate (IV)
BPotassium hydrogentrioxocarbonate (lV)
CZinc granules
DSodium chloride
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Question 1185
waec 2004

What are the values of x, y and z respectively in the following in the following equation? \(MnO_{2(s)} + xHCI_{(aq)} → MnCI_{2(g)} + yHO_{(l)} + zCI_{2(g)}\)

A4,1,2
B1,2,1
C2,1,2
D4,2,1
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Question 1186
waec 2004
What volume of hydrogen would be left over when 300cm3 of oxygen and 1000cm of hydrogen are exploded in a sealed tube? [2H2(g) + O2(g) → 2H2 Og]
A200 cm3
B400 cm3
C600cm3
D700cm3
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Question 1187
waec 2004
Which of the following salts is not prepared by precipitation?
ALead (ll) trioxocarbonate (lV)
BBarium trioxocarbonate (IV)
CSodium trioxocarbnate (IV)
DCalcium trioxocarbonate (IV)
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Question 1188
waec 2004
The alloy used extensively in the building industry is
Asteel
Bbronze
Cduralumin
Dtype metal
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Question 1189
waec 2004

Which of the following pairs of salts undergo hydrolysis?

AAlCI3 and NH4CI
BAICI3 and NaCI
CFeCI3 and KCI
DNa2SO4 and K2 SO4
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Question 1190
waec 2004
The method of collection of gases prepared in the laboratory depend on their
Aodour and atomicity
Bcolour and odour
Catomicity and density
Dsolubility and density
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Question 1191
waec 2004
Which of the following equipment is not used to detect radioactivity?
AWilson cloud chamber
BGeiger- muller counter
CMass spectrometer
DPhotographic plate
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Question 1192
waec 2004
A metal X forms two chlorides with the formulae XCI2 and XCI3. Where is X in the Periodic Table?
What type of bonding exists between X and chlorine in each of the chlorides?
Ametallic bonding
Bionic bonding
Ccovalent bonding
Ddative bonding
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Question 1193
waec 2004
A metal X forms two chlorides with the formulae XCI2 and XCI3. Where is X in the Periodic Table?
AGroup ll
BGroup llI
Cd-block
Ds-block
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Question 1194
waec 2004
One of the characteristics of transition metals is
Areducing ability
Bductility
Cability to conduct electricity
Dformation of coloured ions
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Question 1195
waec 2004
A nuclide emits a beta-particle (e) in the process, that atomic number
Aincreases by 1 while the mass numer remains constant
Bdecreases by 2 while the mass number remains constant
Cremains constant while the mass number decreases by 2
Dremains constant while the mass number increases by 1
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Question 1196
waec 2004
Which of the electrons in the following orbitals will experience the greatest nuclear attraction?
A1s electron of helium
B1s electron of potassium
C23 electron of boron
D2s electron of carbon
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Question 1197
waec 2004
Which of the following properties of elements deceases generally across a period in the Periodic Table?
AElectronegativy
BElectron affinity
CAtomic radluc
Dlonlzation energy
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Question 1198
waec 2004
Which of the following electron transition results in the emission of energy?
A3p to 3s
B3p to 4p
C2s to 2p
D1s to 2s
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Question 1199
waec 2004
The mass of an element is 27 and its atomic number is 13. What is the composition of the nucleus of its atom?
A13 electrons and 14 protons
B13 neutrons and 14 protons
C13 protons and 14 neutrons
D13 electrons and 14 neutrons
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Question 1200
jamb 2004

The IUPAC nomenclature of the compound above is

A2-ethylpentane
B3,4-dimethylhexane
C2,3-dimethylhexane
D2-ethylhexane
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