Question

A solid which is not transparent to visible light and whose electrical conductivity increases with temperature is formed by :

• A. ionic bonding
• B. metallic bonding
• C. covalent bonding
• D. van der waals bonding

Answer 1

Answer: (A)

ionic bonding

Ionic bonding is present in ionic solids. With the increase in temperature, the number of defects in lattice increases which increases the ease of movement of ions and hence the conductivity increases. In metallic bonding, conductivity decreases due to an increase in the scattering of electrons and hence less ease of flow.

Hence, the correct option is $\text{A}$