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 high boiling point of hydrogen fluoride can be explained in terms of?
covalent bonds.
dative bonds.
dipole-dipole bonds
electrovalent (ionic) bonds.
hydrogen bonds.
Correct answer is E
Hydrogen fluoride is formed through covalent bonding (electron sharing) between a hydrogen atom and a fluorine atom.
The reason is the strong electronegativity of the fluorine atom, which causes hydrogen and fluorine atoms to form hydrogen bonds in the liquid phase.
What type of bond holds hydrogen fluoride molecules together when forming larger aggregate?
Covalent
Dative
Hydrogen
Ionic
Metallic
Correct answer is C
No explanation has been provided for this answer.
A device used in the laboratory for intermittent production of gases without heating is
aspirator
delivery tube
fume cupboard
kipp’s apparatus
muller counter
Correct answer is D
No explanation has been provided for this answer.
greater stability in solution
lower electrical charge
smaller mass
stronger tendency to accept electrons
stronger tendency to lose electrons.
Correct answer is D
In an electrolytic cell, when two metallic ions of the same concentration migrate to a graphite cathode, the one that would be preferentially discharged is the one that has the stronger tendency to accept electrons and become a neutral atom.
The planet with the highest number of moon is
Earth
Jupiter
Uranus
Pluto
Venus
Correct answer is B
The planet with the most moons in the Solar System is Jupiter, with a total of 63 confirmed moons (as of 2009).