Question

which of the following form a molecular solidwhich solidified
a) silicon carbide b) calcium fluoride
c) rock salt d) methane
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Answer 1

Answer:

Silicon Carbide form covalent solid, CaF2 and NaCl form ionic crystal. CH4 form molecular solid.

 

Molecular solids -

Atoms or molecules are bonded throug Van Der Waals forces (london dispersion, dipole-dipole interaction and hydrogen bonding).

- wherein

London dispersion: ex., I2(s), Cl2(s), Ne(s), CO2(s)

Dipole- dipole interaction: ex., HCl(s), SO2(s)

Hydrogen bond: ex. ice, HF(s)

 

 

Option 1)

Silicon Carbide

This is incorrect

Option 2)

CaF2

This is incorrect

Option 3)

NaCl

This is incorrect

Option 4)

Methane

This is correct