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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.

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

29 questions
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Question 1 of 9 29 total questions
Question 11
waec 1995
Consider the reaction represented by the equation below: XO + YO → X + YO2 In the reaction, YO acts as
Aan acidic oxide
Ba basic oxide
Ca reducing agent
Da weak base
Ean oxidizing agent
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Question 12
waec 1995

A positive brown ring test indicates the presence of

ANO 3
BFe 3+
CSO 2-3
DCU+
ENO- 2
View Explanation & Discuss
Question 13
waec 1995
The most suitable method for preparing lead (ll) chloride is by
Aaction of dilute HCI on PbSO 4
Bacts of dilute HCI on lead
Caction of dilute HCI on PbCO3
Dbubbling chlorine into a solution of Pb(NO3)2
Emixing aqueous solutions Pb(NO3)2 and NaCI.
View Explanation & Discuss
Question 14
waec 1995
Which of the following species is always present in acidified water?
ANH+4
BO 2-
CHCI
DH3O+
EHNO3
View Explanation & Discuss
Question 15
waec 1995

A weak acid is one which

Ais not corrosive
Bis slightly ionized in water
Cdoes not produce salts with alkalis
Ddoes not conduct an electric current in aqueous solution
Eforms acid salts with bases
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Question 16
waec 1995
What is the percentage by mass of copper in copper in copper (l) oxide (CU2O)? [O = 16; CU =64]
A88.9%
B80.0%
C66.7%
D20.0%
E11.1%
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Question 17
waec 1995
Which of the following cannot be deduced from the electronic configuration of a transition metal?
APossession of magnetic property
BAbility to form complex ions
CPosition in the Periodic Table
DVariable oxidation states
EPhysical properties of the metal
View Explanation & Discuss
Question 18
waec 1995
Which of the following molecules is linear in shape?
ACH4
BH2O
CNH3
DH2S
ECI2
View Explanation & Discuss
Question 19
waec 1995
If a solid has a low melting point and dissolves readily in benzene, it would probably
Acontain strong electrostatic forces of attraction
Bconduct electricity in the molten state
Cdissolve in water
Dhave covalent bonding
Eabsorb moisture on exposure to air
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