Learn more about the properties, composition, and structure of substances (elements and compounds) with these Chemistry questions and answers. This Test can be used by students preparing for Chemistry in JAMB, WAEC, NECO or Post UTME.
The energy change that accompanies the addition of an electron to an isolated gaseous atom is
bond energy
electronegativity
electron affinity
ionization energy
Correct answer is C
No explanation has been provided for this answer.
Which of the following elements would produce coloured ions in aqueous solution?
Calcium
lron
Magnesium
Sodium
Correct answer is B
No explanation has been provided for this answer.
Rare gases are stable because they
contain equal number of protons and neutrons
contain more electrons than protons
are chemically active
have octet structure
Correct answer is D
No explanation has been provided for this answer.
An element with the electron configuration of 1s 22s 22p 6 would have a combining power of
0
2
6
8
Correct answer is A
No explanation has been provided for this answer.
Which of the following ions has the electron configuration 2,8,8?
Na+
Mg2+
F-
CI-
Correct answer is D
Chlorine(Cl) has configuration 2,8,7 but Chlorine ion (Cl-) has 18 electrons and configuration 2,8,8.
Nuclear fission
Nuclar fusion
Radioactive decay
Spontaneous decay
Correct answer is B
No explanation has been provided for this answer.
Which of the following electrons configurations correctly represents an inert element?
1s22s22p4
1s22s22p63s2
1s22s22p63s23p4
1s22s22p6
Correct answer is D
No explanation has been provided for this answer.
How many isotopes has hydrogen?
2
3
4
5
Correct answer is B
No explanation has been provided for this answer.
Which of the following metals exists as liquid at ordinary temperature?
Copper
Gold
Mercury
Silver
Correct answer is C
No explanation has been provided for this answer.
Which of the following substances cannot be classified as a heavy chemical?
AgNO3
CaO
CaOCI2
H2SO4
Correct answer is A
No explanation has been provided for this answer.
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