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) Ar > Kr because of the lower atomic mass and stronger dispersion forces of Ar.
b) Al > H2O due stronger dispersion forces in Al than in H2O.
c) CO2 > SiO2 because SiO2 is a covalent-network solid, and CO2 is molecular.
d) MgF2 > LiF due to higher charge on Mg2+ than Li+.
e) BeO > MgS due ionic bonding in BeO not present in MgS.

Explanation / Answer

d) MgF2 > LiF due to higher charge on Mg2+ than Li+.

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