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 postulate that molecules are in constant random motion best explains why liquids
can undergo solidification
maintain their volumes
are incompressible
have no characteristic shape
Correct answer is A
No explanation has been provided for this answer.
At ordinary temperature H\(_2\)O is a liquid while H\(_2\)S is a gas. This is because H\(_2\)O has
weak intermolecular forces holding its molecules together
strong hydrogen bonds holding its molecules together
induced dipole-induced dipole forces between its molecules
ionic force between its molecules
Correct answer is B
H\(_2\)O has stronger intermolecular dipole--dipole interaction because of the greater polarity (or a hydrogen bond). Because of the stronger intermolecular interaction H\(_2\)O is more stable and exists as a liquid.
condense
evaporate
sublime
precipitate
Correct answer is C
No explanation has been provided for this answer.
2.24 dm3
4.48dm3
22.4dm3
44.8dm 3
Correct answer is B
2g of H\(_2\) = 22.4 dm\(^3\)
0.4g of H\(_2\) = x,
x = \(\frac{0.4 \times 22.4}{2}\) = 4.48dm\(^3\)
Which of the following metals would readily displace hydrogen from steam?
Copper
Lead
Magnesium
Silver
Correct answer is C
In the electrochemical series, H\(^+\) is above all the other elements in the series except Magnesium. Hence, only Mg\(^{2+}\) can displace hydrogen from a reaction.