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.
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.
What type of reaction is represented by the following equation?21D31H → 44He + 10n + energy
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.