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.
What amount of electricity is required to deposit one mole of aluminium from a solution of AlCl3?
One Faraday
One ampere
Three Faradays
Three amperes
Correct answer is C
AlCl3 → Al3+ + 3Cl-
At cathode:
Al3+ + 3e- → Al
3 mole of electrons corresponds 3 F charge
So, required charge =3 F
The following compounds are condensation polymers except
nylon
protein
starch
polyethene
Correct answer is D
Condensation polymers are any kind of polymers whose process of polymerization involves a condensation reaction.
The cleansing effect of soap is low in acidic water because of
the formation of unionized fatty acid.
increase in the pH of the soap molecules.
anti-biodegradable effect of hydrogen ions
the hardness of the acidic water.
Correct answer is A
Soaps cannot be used in acidic condition because they lose their cleansing effect due to the formation of long chain fatty acids
Which of the following sugars is a product of the condensation of monosaccharides?
galactose
maltose
glucose
fructose
Correct answer is B
Maltose is produced by the enzymatic hydrolysis of starch (a homopolysaccharide) catalyzed by the enzyme amylase.
The by-product of fermentation of sugar is
carbon(IV) oxide.
ethanoic acid.
propanol
propan-1, 2, 3- triol.
Correct answer is A
Ethanol fermentation, also called alcoholic fermentation, is a biological process which converts sugars such as glucose, fructose, and sucrose into cellular energy, producing ethanol and carbon dioxide as by-products