Ionic compounds have ionic bonds and are well defined as substances that are able to conduct electricity and exist in a solid state. Thus, options b and d are correct.
Ionic compounds are defined as a substance that shows ionic bondings and is characterized by the presence of the electrostatic force that helds the ions of the compound.
The charged ions carry the electrical charge in the solution. The ionic compounds are generally present as solids that are due to the structure of the crystal lattice that contains an alternative negative and positive charge.
Therefore, options b and d. ionic compounds can conduct electricity is correct.
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Your question is incomplete, but most probably your full question was, From the following statements write those applicable to ionic compounds?
a) Usually do not dissolve in water.
b) Conduct electricity in the molten state and aqueous solution.
c) Generally not a conductor of electricity.
d) Exists in the solid state
