Question

Which substance is likely to have a giant ionic structure?

A. Melts at 1400oC, insoluble in water, good conductor of electricity either when solid or molten
B. Melts at 2800oC, insoluble in water, non-conductor of electricity when molten or solid
C. Melts at 17oC, insoluble in water, non-conductor of electricity either when solid or molten
D. Melts at 2600oC, dissolves in water, non-conductor of electricity when solid, undergoes electrolysis in aqueous solution

Answer 1

The substance likely to have a giant ionic structure is option A, which has a high melting point, is insoluble in water, and conducts electricity.

Step-by-step explanation:

The substance that is likely to have a giant ionic structure is option A. It has a high melting point (1400°C), is insoluble in water, and is a good conductor of electricity when solid or molten. These characteristics are typical of a giant ionic structure, where positive and negative ions are arranged in a regular 3D lattice.