Question

Ionic solids have a unique set of physical properties.
Which of the following is not a property of ionic solids?

• A. Ionic solids can form two-dimensional structures.
• B. Ionic solids have high melting points.
• C. Ionic solids shatter when struck with a hard object.
• D. Ionic solids dissolve in polar solvents to varying extents.

Answer 1

Answer: (A)

Ionic solids can form two-dimensional structures.

Ionic compounds :-

The compounds which are bonded through ionic bond which involves the transfer of electrons from atom to another atom.

The ionic bond is formed between two atoms based on the difference in electronegativity of the atoms.

These contains Anions and cations as constituests. Eg :- $NaCl$

Properties of ionic compounds :-

$\to$ They form crystal lattices due to stronger bond energies and have charges and have high lattice energy.

$\to$ They are hard and brittle.

$\to$ They have high melting and boiling points.

$\to$ They conduct electricity only in aqueous solutions molten state.

$\to$ Ionic solids shatter when struck with a hard object.

$\to$ Ionic solids dissolve in polar solvents to varying extents.

$\to$ Ionic solids are arranged in an extended three dimensional array of molecules which maximises the attractive electrostatic interaction and decreases the repulsive electro static interactions between anions and cations.

As it is well known, ionic compounds do not form $2-d$ structures.