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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 691
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 692
waec 2014
An aqueous solution of Na2CO3 is
Aacidic
Balkaline
Camphoteric
Dneutral
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Question 693
waec 2014
How many lone pair (s) of electrons is present in HF?
Ao
B1
C2
D3
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Question 694
waec 2014
NH4- is formed from NH3 and H- by
Acovalent bonding
Bdative bonding
Chydrogen bonding
Dionic bonding
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Question 695
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 696
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 697
waec 2014

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

ACu
BFe
CTi
DZn
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Question 698
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 699
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 700
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 701
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 702
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 703
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 704
waec 2014
The shape of CH4 is
Alinear
Bplanar
Cpyramidal
Dtetrahedral
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Question 705
jamb 2014
Z in diagram above represents
Aheat of reaction
Bactivation energy
Cfree energy
Dentropy of reaction
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Question 706
jamb 2014

In the diagram, the function of the concentrated H2SO4 is to?

 

 

 

 

 

 

Apurify the gas
Bdry the gas
Cliquefty the gas
Dremove odour
View Explanation & Discuss
Question 707
jamb 2014

The IUPAC nomenclature of the compound above is

A2-bromo-3-chlorobutanol
B3-bromo-2-chlorobutanol
C3-chloro-2-bromobutanol
D2-chloro-3-bromobutanol
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Question 708
jamb 2014
The petroleum fraction that is used in heating furnaces in industries is
Adiesel oil
Bgasoline
Ckerosene
Dlubricating oil
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Question 709
jamb 2014

The process of converting linear alkanes to branched chain and cyclic hydrocarbons by heating in the presence of a catalyst to improve the quality of petrol is referred to as

Arefining
Bcracking
Creforming
Dblending
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Question 710
jamb 2014

Polystyrene is widely used as packaging materials for fragile objects during transportation because of its

Alightness
Blow density
Chigh density
Dhigh compressibility
View Explanation & Discuss
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