a) Presence of ions is necessary for the conduction of electricity. Migration of ions towards oppositively charged electrodes leads to the conduction of electricity. Solid sodium chloride has no free ions to conduct electricity but in liquid state sodium chloride dissociates into sodium and chloride ions which are responsible for the conduction of electricity. Therefore, sodium chloride in its solid state does not conduct electricity whereas sodium chloride in its liquid state conducts electricity.
b)Pure water is a good conductor of electricity
No, pure water is a poor conductor of electricity because it lacks the ions for the conduction of electricity. Impure water contains dissolved salts whose ions conduct electricity. Hence, its impure water which conducts electricity.
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