Choose the answer which presents the chemical formulas for two substances in ord

Question

Choose the answer which presents the chemical formulas for two substances in order of decreasing melting point (highest melting point first) and gives a valid reason for this order.



a) MgF2 > NaF due to the higher molar mass of MgF2.
b) H2O > Al due to hydrogen-bonding in H2O not present in Al.
c) CaO > ScN due to ionic forces in CaO not present in ScN.
d) SiF4 > Si due to the higher molar mass of SiF4.
e) BeO > MgS due to smaller ions present in BeO leading to larger lattice energy.

Explanation / Answer

e) BeO > MgS due to smaller ions present in BeO leading to larger lattice energy.

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