Metallic and Electrolytic conductors
All substances do not conduct electrical current. The substances, which permit the passage of electric current, are termed as conductors. The best metal conductors are such as tin, silver, copper, etc. On the other hand, substances, which do not permit the passage of electric current through them, are termed as non-conductors or insulators. Some of the common examples of insulators are wood, wax, rubber, etc.
The conductors are majorly classified into two types,
Metallic and electrolytic conductors.
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Metallic conduction
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Electrolytic conduction
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(i) It is due to the flow of electrons.
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(i) It is due to the flow of ions.
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(ii) It is not accompanied by decomposition of the substance.(Only physical changes occurs)
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(ii) It is accompanied by decomposition of the substance. (Physical as well as chemical change occur)
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(iii) It does not involve transfer of matter.
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(iii) It involves transfer of matter in the form of ions.
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(iv) Conductivity decreases with increase in temperature.
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(iv) Conductivity increases with increases in temperature and degree of hydration due to decreases in viscosity of medium.
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The electrolyte can, therefore, be defined as the substance whose aqueous solution or fused state conducts electricity accompanied by the chemical decomposition. The conduction of the current through electrolyte is due to the movement of the ions.
Contrary to this, substances, which in the form of their solutions or in their molten state do not conduct electricity, are called non-electrolytes.
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