Arrange the following materials in ascending order based on its conductivity at 298.15 K

(a) Copper

(b) Sodium

(c) Iron

(d) Gold 

Correct option is A

Correct Answer: (a) -(c), (b), (d) and (a)
Explanation:
· Electrical conductivities of the given metals at around 298.15 K (room temperature) are approximately:
· Iron (c) ≈ lowest
· Sodium (b) ≈ higher than iron
· Gold (d) ≈ very high
· Copper (a) ≈ highest among the four
· Therefore, the ascending order (lowest → highest conductivity) is: Iron < Sodium < Gold < Copper
· This corresponds to: (c), (b), (d), (a).
Information Booster:
· Conductivity depends on the number of free electrons and electron mobility in a metal.
· Copper has one of the highest conductivities among all metals (second only to silver).
· Gold also conducts very well and resists corrosion—making it ideal for high-quality electrical contacts.