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.
naturally radioactive
abundant in nature
a transition metal
an isotopic mixture
Correct answer is D
No explanation has been provided for this answer.
The oxide from electric power station is
carbon (IV) oxide
copper (ll) oxide
nitrogen (IV) oxide
sulphur (IV) oxide
Correct answer is C
Nitric oxide is an important component of the air pollution generated by automotive engines and thermal power-generating plants.
sulphur dioxide may also be produced in case of fuel containing sulphur, Nigeria crude is sulphur free,
The most common process in the extraction of metals from their ore is
catalysis
electrolysis
oxidation
reduction
Correct answer is D
No explanation has been provided for this answer.
Which of the following gases is used to retard the vaporization of the filament in a light bulb?
Argon
Helium
Hydrogen
Oxygen
Correct answer is A
No explanation has been provided for this answer.
The purity of a solid sample can best be determined by its?
boiling point
melting point
conductivity
solubility
Correct answer is B
- The presence of impurities in a substance results in a lower melting point due to a process called melting point depression.
- That implies a pure solid has a SHARP melting point which is of the standard value when compared.