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.
A solid with higher melting and boiling points is likely to be?
Covalent compound
A Dative compound
An Electrovalent compound
A Non-metal
Correct answer is C
Ionic Compounds / Electrovalent compounds Have A High Melting Point and High Boiling Point.
The periodic table is an arrangement of elements according to their?
Oxidation number
Atomic number
Mass number
Number of neutrons
Correct answer is B
Elements are arranged in order of increasing atomic number
To obtain pure carbon(ii)oxide from its mixture with carbon(iv)oxide, the mixture should be?
Passed over heated copper(ii)oxide
Bubbled through water
Bubbled through conc H\(_2\)SO\(_4\)
Bubbled through conc NAOH
Correct answer is D
carbon(ii)oxide is prepared from carbon(iv)oxide by passing the latter through red-hot carbon and the unchanged CO\(_2\) is removed when the mixture of the gases through conc NAOH.
The most important element on the earth's crust is?
Nitrogen
Hydrogen
Oxygen
Fluorine
Correct answer is C
Oxygen, O2, is by far the most abundant element in earth's crust at 46.6 percent, nearly half of the mass of the crust.
Aluminum hydroxide is used in the dyeing industry as a?
Dye
Dispersant
Salt
Mordant
Correct answer is D
Aluminum hydroxide is also used as a mordant in dyeing.