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.
From the equation above, calculate the volume of unreacted oxygen gas if a mixture of 50cm3 of hydroden and 75cm3 of oxygen are involved
85cm3
50cm3
125cm3
55cm3
Correct answer is B
Since 2 mol H2 reacted with 1 mol of O2
: 50cm3 of hydrogen reacted with 25cm3 of oxygen
Remainder oxygen = Supplied amount - Reacted amount → 75cm3 - 25cm3
= 50cm3
Crude petroleum is converted to useful products by the process of?
fractional crystallization
fractional distillation
filtration
chromatography
Correct answer is B
A process called fractional distillation is used in oil refineries to separate (as well as join or split) the various lengths of hydrocarbon chains to create different petroleum products from the different distillates.
An organic compound which decolorizes bromine water is likely to be?
C3H8
C2H6
C4H10
C2H4
Correct answer is D
If you shake an alkene with bromine water (or bubble a gaseous alkene through bromine water), the solution becomes colourless.
Alkenes decolourise bromine water.
In order to electroplate spoon with silver, the arrangement of the electrolytic cell is?
the anode is a silver rod and the cathode is the spoon
the anode is the spoon and the cathode is a silver rod
the electrolyte is silver trioxonitrate(v)( solution and the cathode is a silver rod.
the electrolyte is silver trioxonitrate(v) solution and the anode is the spoon
Correct answer is A
The steel spoon to be coated with silver is the cathode of the electrolytic cell and the anode of the electrolytic cell is made of a silver metal