Poor Conductors of Electricity is/are

Poor conductors of electricity is/are: (a) Silver (b) Aluminium (c) Pure water (d) Copper

The correct answer is option c, i.e. Pure Water.

Explanation: 

In order to conduct electricity, an object or substance should have free electrons, which will help to carry the charges across the surface, and the electricity is conducted. 

Pure water does not conduct electricity. Pure water doesn’t have any free electrons or any minerals dissolved; dissolved minerals are also necessary for conducting electricity. Hence pure water is not able to conduct electricity due to the absence of free electrons and dissolved minerals. 

Silver is a good conductor of electricity due to the presence of free electrons, which helps in the movement of electrical charge from one place to other and across the surface and helps to conduct the charges. But Silver is not used for making wires because they are expensive, and thieves can easily steal these wires if present outside. 

Copper is one of the most widely used materials for creating wires that carry current. Most electrical appliances use copper wire due to better conductivity. Copper wires conduct current very easily. Aluminium is also metal with high electrical conductivity. The conductivity of metals is very high because they have free electrons, and that helps in the conduction of electricity easier.