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a
A - 4 ; B - 2 ; C - 3 ; D -1
b
A - 3 ; B - 2 ; C - 4 ; D -1
c
A - 3 ; B - 1 ; C - 4 ; D - 2
d
A - 4 ; B - 1 ; C - 3 ; D - 2
answer is C.
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Detailed Solution
In ionic solids, strong coulombic forces binds the ions together, so they are not free to move. However, in aqueous state or in molten state, these forces get weaker or and ions get free to move so they can conduct electricity. Network solids are in fact giant molecules due to their large three dimensional structure. In metallic solids, positive ions are surrounded by the sea of electrons.Hydrogen bonded molecular solids may be volatile liquids or soft solids at room temperature.