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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.

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

53 questions
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Question 1 of 13 53 total questions
Question 21
waec 2009
Which of the following arrangements is in order of increasing ionization energy?
AAI, Si, P, S
BSi, AI,S,P
CS,P,Si,AI
DP, Si,S,AI
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Question 22
waec 2009
Which of the following properties of covalent compounds is not correct? They
Aare non-electrolytes
Bare mostly gaseous and volatile liquids
Chave low melting point
Dhave high boiling points
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Question 23
waec 2009

Which of the statements about the behaviour of the atom is correct?

Aatomic size decreases down the group
Batomic size increases across the period
Canions are smaller than the parent atom
Dcations are smaller than the parent atom
View Explanation & Discuss
Question 24
waec 2009
An element Q forms a compound QCI5. In which group of the periodic table is Q?
Al
Blll
CV
DVII
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Question 25
waec 2009
Which of the following electronic configurations correctly represents an element in period 3 of the periodic table?
A1s2 2s2 2p2
B1s2 2s2 2p6
C1s2 2s2 2p6 3s2 3p4
D1s2 2s2 2p6 3s2 3p6 4s1
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Question 26
waec 2009

Which of the following ions is isoelectronic with neon? [\(_3\)Li, \(_9\)F, \(_{10}\)Ne, \(_{17}\)CI,\(_{19}\)K ]

ACI-
BF-
CK+
DLi,+
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Question 27
waec 2009
The following properties are characteristics of transition elements except
Aformation of complex ions
Bfixed oxidation states
Cformation of coloured compounds
Dcatalytic abilities
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Question 28
waec 2009
Which of the following elements has the electronic configuration:1s22s22p63s23p1? [11Na, 13A1,
14N,16S]
AAl
BNa
CN
DS
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Question 29
waec 2009
How many orbitals are associated with the p-sub energy level?
A2
B3
C5
D6
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Question 30
waec 2009
Consider the reaction represented by the equation: 23892U + 10 → 139 56Ba + 94 36Kr + 31 0n. The reaction represents a
Anuclear fission
Bnuclear fusion
Cradioactive decay
Dspontaneous disintegration
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Question 31
waec 2009
If 100 atoms of element X contains 70 atoms of 9X and 30 atoms of 11X, calculate the relative atomic mass of X
A9.6
B10.6
C11.6
D20.0
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Question 32
waec 2009
How many protons does 4020Ca contain?
A20
B30
C40
D60
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Question 33
waec 2009
Which of the following scientists discovered the neutron?
AErnest Rutherford
BJ.J Thompson
CJames Chadwick
DR. A. M illikan
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