Question

Arrange in the order of conductivity: \[ \text{Na, Ag, Fe, Cu} \]

• A. Ag $>$ Cu $>$ Na $>$ Fe
• B. Na $>$ Cu $>$ Fe $>$ Ag
• C. Cu $>$ Fe $>$ Ag $>$ Na
• D. Fe $>$ Na $>$ Cu $>$ Ag

Hint:

Metals like silver and copper have high conductivity due to their abundance of free electrons. Alkali metals like sodium also conduct well in ionic form but not as efficiently as transition metals.

Answer 1

The Correct Option is A

Conductivity of a substance is determined by the number of free ions or mobile electrons it has. Conductivity increases with the ability of the material to allow charge flow.

1. Step 1: Analyze the conductivity of each metal. - Ag (Silver): Silver has the highest conductivity because it has the highest number of free electrons, and it is an excellent conductor. - Cu (Copper): Copper also has a high conductivity, although it is slightly less than silver. - Na (Sodium): Sodium is an alkali metal, and although it is a good conductor in its ionic form in solution, its metallic conductivity is lower compared to copper and silver. - Fe (Iron): Iron has the lowest conductivity among the listed elements because it has fewer free electrons compared to the others. Thus, the order of conductivity is Ag > Cu > Na > Fe.