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) PH3 > NH3 due to dipole-dipole forces in PH3 not present in NH3. b) PbCl4 > PbO2 due to lower charge on Cl - than O2-. c) NaF > MgF2 due to the lower molar mass of NaF. d) Si > SiF4 due to covalent-network bonding in Si, versus dispersion forces in SiF4. e) SiO2 > SeO2 due ionic bonding in SiO2 but not in SeO2.

Explanation / Answer

c) NaF > MgF2 due to the lower molar mass of NaF.

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