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.
In the laboratory preparation of oxygen, dried oxygen is usually collected over
hydrochloric acid
mercury
calcium chloride
tetraoxosulphate (VI) acid
Correct answer is B
No explanation has been provided for this answer.
The bleaching action of chlorine gas is effective due to the presence of
hydrogen chloride
water
air
oxygen
Correct answer is B
No explanation has been provided for this answer.
Pb2+
Cu2+
Fe3+
Fe2+
Correct answer is C
The brown color indicates the presence of iron (III) (Fe\(^{3+}\)).
The effect of the presence of impurities such as carbon and sulphur on iron is that they
give it high tensile strenght
make it malleable and ductile
increase its melting point
lower its melting point
Correct answer is D
No explanation has been provided for this answer.
The impurities formed during the laboratory preparation of chlorine gas are removed by
H2O
NH3
H2SO4
HCl
Correct answer is A
No explanation has been provided for this answer.