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 electrolytic extraction of aluminum, the function of the molten cryolite is to
precipitate aluminium hdroxide
lower the melting point of aluminium oxide
act as a raw materials
act as a solvent
Correct answer is B
No explanation has been provided for this answer.
The type of iron that is best suited for welding, making nails, chains and iron rods is?
pig iron
wrought iron
cast iron
iron pyrites
Correct answer is B
uses of wrought iron
Copper metal dissolves in concentrated trioxonitrate (V) acid with the resultant evolution of?
CO2
SO2
NO2
CO
Correct answer is C
Oxidation of Copper turnings with concentrated trioxonitrate (V) acid wil
Cu + 4HNO\(_3\) → CuNO\(_3\) + 2H\(_2\)O +2NO\(_2\).
which of the following metals will show the highest metallic character?
Zinc
Copper
Barium
Calcium
Correct answer is C
The reactivity series of metals, also known as the activity series, refers to the arrangement of metals in the descending order of their reactivities.
Na > Ca > Mg > Al > Zn > Fe > Sn > Pb > Cu > Ag.
Considering metallic property which increases down the group, barium will be ranked calcium
Which of the following allotrope of carbon is a constituent of a lead pencil?
Graphite
Diamond
Lampblack
Soot
Correct answer is A
When an element exists in more than one crystalline form, those forms are called allotropes; the two most common allotropes of carbon are diamond and graphite.
Graphite is used in pencils and lubricants. It is a good conductor of heat and electricity. Its high conductivity makes it useful in electronic products such as electrodes, batteries, and solar panels.