Question 5
[Maximum number: 1]
Which statement describes a property of potassium iodide?
A
It is insoluble in water.
B
It is a volatile substance.
C
It has a low melting point.
D
It conducts electricity when molten.
CAIE IGCSE Chemistry Properties of Ionic Compounds
Practise explaining ionic melting points and electrical conductivity by referring to strong lattice attractions and whether charged ions are free to move.
How this is tested
- explain high melting point through strong attractions between oppositely charged lattice ions
- explain non-conduction in a solid because its ions are held in fixed lattice positions
- explain conduction when molten or aqueous because mobile ions carry charge through the liquid