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Which of the following statements regarding ionic compounds is INCORRECT?
Ionic compounds have a high melting point.
Ionic compounds in solid state conduct electricity.
Ionic compounds are generally soluble in water.
Ionic compounds are solids.
Ionic compounds in solid state conduct electricity.
Ionic compounds consist of ions held together by strong electrostatic forces in a rigid crystal lattice. Because these ions are fixed in position and cannot move freely, they cannot conduct electricity in the solid state.
Ionic compounds consist of ions held together by strong electrostatic forces in a rigid crystal lattice. Because these ions are fixed in position and cannot move freely, they cannot conduct electricity in the solid state.
Think of solid salt like students sitting in assigned desks in a classroom; they cannot move around, so they cannot 'transfer' information (or charge) across the room. Once the salt is dissolved in water, it's like a recess break where students are free to walk around and carry messages across the room.
SOLIDS STOP IONS
FeтАЛ=kтЛЕr2q1тАЛq2тАЛтАЛ тАФ Coulomb's Law, defining the strong electrostatic force between ions.
In the solid state, ions (like Na+ and ClтИТ) occupy fixed positions in a lattice. For a substance to conduct electricity, it must contain charge carriers that are free to move; since the ions are locked in place, the solid is an insulator. Conductivity is only possible when the ionic compound is in a molten state or dissolved in water, allowing the ions to become mobile charge carriers.
Ionic compounds exist as crystalline solids due to high lattice energy.
Strong electrostatic forces of attraction between oppositely charged ions result in high melting points.
Solid ionic compounds are electrical insulators.
Ionic compounds become conductors when molten or in aqueous solution.
High structural stability due to rigid lattice arrangement.
Lack of electrical conductivity in solid form limits use in solid-state electronics.
Electrolytic cells (using molten or aqueous salt).
Electroplating processes.
Option A (High melting point) is correct as ionic bonds require significant energy to break.
Option C (Generally soluble in water) is correct as water molecules polarize the crystal lattice to separate ions.
Option D (Ionic compounds are solids) is correct as the strong electrostatic forces create a compact solid structure at room temperature.
B is correct тАФ ionic compounds are poor conductors of electricity in the solid state because their ions are held in fixed positions within the crystal lattice.
Always remember: Conductivity requires mobile charges. In metals, these are free electrons; in ionic compounds, these are free ions (only available in liquid/aqueous states).
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