Option 1: Salts have ordered packing arrangements called lattices.

Explanation: This statement is true. Salts have a regular, repeating arrangement of ions in a crystal lattice structure. The positive and negative ions are arranged in a specific pattern.

Option 2: Salts have low melting points but high boiling points.

Explanation: This statement is incorrect. Salts generally have high melting points due to strong ionic bonds. However, their boiling points vary depending on the specific salt and its composition.

Option 3: Salts are brittle.

Explanation: This statement is true. Salts are generally brittle, meaning they are easily broken or shattered when subjected to force. This is because the ionic bonds in salts are strong, but they are not flexible like covalent bonds.

Option 4: Salts conduct electricity when dissolved in water or even in the molten state.

Explanation: This statement is true. Salts conduct electricity in their molten state or when dissolved in water because the ions become free to move and carry an electric charge. This is due to the dissociation of the salt into its constituent ions. However, solid salts do not conduct electricity as the ions are held in a fixed position and cannot move.