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.