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 shape of a graphite crystal is
tetrahedral
pyramidal
hexagonal
octahedral
Correct answer is C
Graphite is a crystalline form of the element Carbon. The atoms are arranged in a hexagonal structure.
Which of the following halogens is liquid at room temperature?
Chlorine
Fluorine
lodine
Bromine
Correct answer is D
Bromine is the third lightest halogen. It is a fuming red-brown liquid at room temperature.
Which of the following elements is a metalloid?
Carbon
Oxygen
Silicon
Sodium
Correct answer is C
Some examples of metalloids include boron, silicon, germanium, arsenic etc.
ll only
l and ll only
l and lll only
ll and lll only
Correct answer is C
The properties of radioactive elements holds true except that radioactive decay is not dependent on external conditions except electron capture and bombarding the radioactive material with subatomic particles.
The d-block elements are paramagnetic because they
contain paired electrons which are repelled by magnetic field
contain unpaired electrons in the partially filled 3d-orbital
contain paired electrons which are repelled by magnetic field force
have delocalized valence electrons
Correct answer is B
Paramagnetism is a characteristic possessed by an atom with an unpaired electron.