Which of the following will have a plane, axis and centre of symmetry?

The answer is 2. True solids.

True solids have a regular arrangement of atoms or molecules, which gives them a definite shape and volume. This regular arrangement also means that true solids have planes, axes, and centers of symmetry.

Pseudosolids, supercooled liquids, and liquids do not have a regular arrangement of atoms or molecules, so they do not have planes, axes, and centers of symmetry.

Here is a table summarizing the properties of the four types of materials:

Material	Regular arrangement of atoms/molecules	Plane, axis, and center of symmetry
True solid	Yes	Yes
Pseudosolid	No	No
Supercooled liquid	No	No
Liquid	No	No