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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.

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

1,623 questions
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Question 1 of 20 1,623 total questions
Question 291
waec 2014
A gaseous mixture contains 0,256 g of hydrogen and 2.00 g of oxygen. The mole ration of hydrogen to oxygen in the mixture is (H=1.00; O=16,0)
A1:1
B2:1
C1:4
D8:1
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Question 292
waec 2014
An aqueous solution of Na2CO3 is
Aacidic
Balkaline
Camphoteric
Dneutral
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Question 293
waec 2014
How many lone pair (s) of electrons is present in HF?
Ao
B1
C2
D3
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Question 294
waec 2014
NH4- is formed from NH3 and H- by
Acovalent bonding
Bdative bonding
Chydrogen bonding
Dionic bonding
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Question 295
waec 2014

The relative atomic mass of chlorine is not a whole number because

Ait is the weighted average mass of all its various isotopes
Bit is the average mass of all the isotopes of the element
Cthe element has strong oxidizing ability
Dthe atom contains a higher number of neutrons than protons
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Question 296
waec 2014

An atom W has 17 electrons and 18 neutrons. Which of the following representations of the atom is correct?

A1718W
B1817W
C3517W
D3518W
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Question 297
waec 2014

Which of the following transition metals is not attracted to external magnetic field?

ACu
BFe
CTi
DZn
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Question 298
waec 2014

The electron configuration of \(_{26}Fe^{3+}\) is?

A[Ar]4s23d6
B[AR]4s23d3
C[AR]4s13d4
D[AR]4s03d5
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Question 299
waec 2014
Which of the following processes is used in food preservation in an industry?
ACarbon dating
BIeeadiation of gamma rays
CNuclear fission
DNuclear fusion
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Question 300
waec 2014
Which of the following arrangements is in decreasing order of atomic radius?
ALi>Be>C>
BLi>B>Be>C
CLi>Be>B>C
DC>B>Be>Li
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Question 301
waec 2014
The two elements 11X and 19Y are in the same group because they have the same
Avalence electrons
Bionization energy
Cnumber of shell
Datomic size
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Question 302
waec 2014
Hydrogen bonds are formed between molecules containing a hydrogen atom bonded to a
Astrongly electronegative atom
Bnon-polar species
Cdiatomic element
Dcomplex ion
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Question 303
waec 2014

The crystal layers in graphite are held together by

Acovalent bond
Belectrostatic forces
Cionic bond
Dvan der Waal's forces
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Question 304
waec 2014
The shape of CH4 is
Alinear
Bplanar
Cpyramidal
Dtetrahedral
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Question 305
waec 2013
Which of the following statements about thermoplastic material is correct? They
Ado not melt on heating
Bharden on heating
Cdecompose on heating
Dsoften and melt on heating
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Question 306
waec 2013

Bronze is a mixture of

ACu and Mg
BCu and Sn
CCu and Zn
DCu and Pb
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Question 307
waec 2013
Which of the following materials is classified as a non-biodegradable pollutant?
AAnimal hide
BPaper
CPlastic
DWood
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Question 308
waec 2013
Which of the following statements about fine chemical is correct? It
Ais injurious to health
Bhas low degree of purity
Cis produced in relatively small amount
Dcan be stored for a long time
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Question 309
waec 2013
Which of the following raw materials is used in a plastic industry?
AEthene
BMethane
CCalcium
DHydrogen
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Question 310
waec 2013
The main function of limestone in the blast furnace is to
Aact as catalyst
Bact as reducing agent
Cremove impurity
Dsupply carbon (IV) oxide
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