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 colour of methyl orange in alkaline medium is?
yellow
pink
orange
red
Correct answer is A
Methyl orange has the property to color alkaline and neutral water yellow.
Calculate the volume of 0.5 mol dm-3 H2So4 that is neutralized by 25 cm3 of 0.1 mol dm-3 NaOH?
5.0 cm3
2.5 cm3
0.4 cm3
0.1 cm3
Correct answer is B
No explanation has been provided for this answer.
The acid that is used to remove rust is?
boric
hydrochloric
trioxonitrate (V)
tetraoxosulphate (VI)
Correct answer is B
No explanation has been provided for this answer.
Carbon (II) oxide is considered dangerous if inhaled mainly because it?
can cause injury to the nervous system
competes with oxygen in the blood
competes with carbon (IV) oxide in the blood
can cause lung cancer
Correct answer is B
Carbon monoxide is harmful when breathed because it displaces oxygen in the blood and deprives the heart, brain and other vital organs of oxygen.
Coffee stains can best be removed by?
Kerosine
turpentine
a solution of borax in water
ammonia solution
Correct answer is C
Borax solution refers to sodium borax in water. it is used for cleaning purposes. borax is mildly alkaline and can help break down acidic stains, such as those from coffee