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.
When an atom gains an electron, it becomes properties
chemically inactive
negatively charged
oxidized
a cation
a complex ion
Correct answer is B
No explanation has been provided for this answer.
The existance of two or more forms of the same element in the same physical state is known as
allotropy
resonance
hybridization
isotopy
isomerism
Correct answer is A
Allotropy or allotropism is the property of some chemical elements to exist in two or more different forms, in the same physical state.
A sample of air that has been passed through caustic potash will
contain more oxygen than nitrogen
rekindle a glowing splint
have no action on lime water
contain no water vapour
be free of noble gases
Correct answer is C
- Potassium hydroxide also absorbs carbon dioxide from the air. - If carbon dioxide is bubbled through limewater, the limewater turns milky or cloudy white.
Chlorine is prepared on a large scale by the
electrolysis of concentrated sodium chloride solution
action of manganese (IV) oxide on hot concentrated hydrochloric acid
action of concentrated tetraoxosulphate (IV) acid on sodium chloride
oxidation of concentrated hydrochloric acid with potassium tetraxosulphate (VII)
action of dilute mineral acids on bleaching powder
Correct answer is A
No explanation has been provided for this answer.
Which of the following oxides is amphoteric?
Na2O
Fe2O3
AI2O3
CaO
CuO
Correct answer is C
No explanation has been provided for this answer.