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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.

48 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10
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Past Questions

48 questions
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Question 1 of 20 48 total questions
Question 1
jamb 2003

2HCI(ag) + CaCO\(_3\)(s) → CaCl\(_2\)(s) + CO\(_2\)(g)  + H\(_2\)O(l). From the reaction above, which of the curves in the diagram represents the production of carbon (IV) oxide as dilute HCI is added?

AL
BM
CN
DP
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Question 2
jamb 2003

The principal constituent of natural gas is

Amethane
Bethane
Cpropane
Dbutane
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Question 3
jamb 2003

Which of the following is found in cotton

AStarch
BCellulose
CFat
DOil
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Question 4
jamb 2003

The process by which atoms are rearranged into different molecular structure in the petroleum refining process is referred to as

Acatalytic cracking
Bhydrocracking
Cpolymerization
Dreforming
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Question 5
jamb 2003
A compound contains 40.0% carbon 6.7% hydrogen and 53.3% oxygen. If the molar mass of the compound is 180, find the molecular formula.
[H = 1, C = 12, O = 16]
ACH2O
BC3H6O3
CC6H12O6
DC6H12O3
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Question 6
jamb 2003

Ethanol reacts with excess acidified K\(_2\)Cr\(_2\)O\(_7\) to produce

Aethanedioic acid
Bethanal
Cethylethanoate
Dethanoic acid
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Question 7
jamb 2003

The type of reaction that is peculiar to benzene is?

Aaddition
Bhydrolysis
Cpolymerization
Dsubstitution
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Question 8
jamb 2003

The formula for ethyl butanoate is

AC3H7COOC2H5
BC2H5COOC3H7
CC4H9COOC2H5
DC2H5COOC4H9
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Question 9
jamb 2003

The leachate of a certain plant ash is used in local soap making because it contains

Asodium chloride and potassium hydroxide
Bsodium hydroxide
Cpotassium hydroxide
Dsoluble carbonates and hydrogen carbonates
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Question 10
jamb 2003

How many isomers does pentane have?

A6
B5
C4
D3
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Question 11
jamb 2003

Ethene reacts with hydrogen bromide to give

ACH2Br2
BCH3CH2Br
CC2H2Br2
DCHBr2
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Question 12
jamb 2003

The modern process of manufacturing steel for iron is by

Atreatment with acids
Boxidation
Cblast reduction
Dtreatment with alkanal
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Question 13
jamb 2003

Chlorine gas turns a damp starch-iodide paper

Apink
Bcolourless
Cred
Ddark blue
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Question 14
jamb 2003

The metal that liberates hydrogen from cold water in bubbles only is?

ANa
BK
CCa
DAl
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Question 15
jamb 2003

The salt that will form a precipitate soluble in excess ammonia solution is

ACa(NO3)2
BCu(NO3)2
CMg(NO3)2
DAl(NO3)3
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Question 16
jamb 2003

Which of the following statements is true of sulphur (IV) oxide?

AIt forms tetraoxosulphate (VI) acid with water
BIt is an odourless gas
CIt is an acid anhydride
DIt forms white precipitate with acidified barium chloride
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Question 17
jamb 2003

Hydrogen can be displaced from a hot alkaline solution by?

AFe
BCu
CCa
DSn
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Question 18
jamb 2003

Metals of the first transition series have special properties which are different from those of groups I and II elements because they have partially filled

As orbitals
Bp orbitals
Cd orbitals
Df orbitals
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Question 19
jamb 2003

Chlorine gas is prepared in the laboratory by

Aadding concentrated hydrochloric acid to solid manganese (IV) oxide
Baciding concentrated tetraoxosulphate (VI) acid to solid sodium chloride
Cdropping concentrated hydrochloric acid onto potassium tetraoxomanganate (VI) crystals
Daciding concentrated tetraoxosulphate (VI) acid to hydrochloric acid
View Explanation & Discuss
Question 20
jamb 2003

Which of the following is an electrolyte?

AAlcohol
BSodium acetate solution
CSolid potassium hydroxide
DMercury
View Explanation & Discuss
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