Which statement indicates that a substance may be an ionic compound?
it has a low melting point.
it is made up of molecules.
it can be flattened by a force.
it is made up of a crystal lattice.

Answer : The correct option is, it is made up of a crystal lattice.

Explanation :

Ionic compounds : Ionic compounds are the compounds which are made up ions or it is made up of a crystal lattice.

Properties of ionic compound :

The ionic compound can not be flattened by force due to high electrostatic force attraction.

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explanation:

covalent bonds

consist of pairs of electrons shared by two atoms, and bind the atoms to fixed orientation and requre high energies to break them

ionic bonds

when two atoms differ considerably in their electronegativity, then one of the atoms will lose its electron to the other atom. this results in a positively charged ion(cation) and a negatively charged ion (anion)