Which of the following has the highest melting point ?
Which of the following has the highest melting point ?
The correct option is D Al2O3
Melting point: The temperature
at which a substance undergoes a solid to liquid phase change without an
increase in temperature is called Melting point (i, e... the energy required to change the state of an
element from its solid state to its liquid state). MgO has the highest
melting point among the following. It is because comparing Na2O, MgO
and Al2O3 MgO has higher melting point due to the reason
that ionic compounds have higher melting points than covalent compounds. The
charge on the magnesium is 2+; the charge on the oxide ion is 2–. The formula
is MgO. Magnesium oxide will have the largest lattice energy because it has the
largest attraction between the two ions. The size of the magnesium ion is
smaller than the sodium ion; coming to the CaO and MgO, the melting point of the metals decreases
down the group. This is because as
the metal ions get
larger the distance between the bonding electrons and the positive nucleus gets
larger and reduces the overall attraction between the two.
Melting point: The temperature at which a substance undergoes a solid to liquid phase change without an increase in temperature is called Melting point (i, e... the energy required to change the state of an element from its solid state to its liquid state). MgO has the highest melting point among the following. It is because comparing Na2O, MgO and Al2O3 MgO has higher melting point due to the reason that ionic compounds have higher melting points than covalent compounds. The charge on the magnesium is 2+; the charge on the oxide ion is 2–. The formula is MgO. Magnesium oxide will have the largest lattice energy because it has the largest attraction between the two ions. The size of the magnesium ion is smaller than the sodium ion; coming to the CaO and MgO, the melting point of the metals decreases down the group. This is because as the metal ions get larger the distance between the bonding electrons and the positive nucleus gets larger and reduces the overall attraction between the two.
