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Question

Which of the following is not a typical property of an ionic compound?


A

High melting point

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B

Conducts electricity in aqueous and molten state

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C

They are insoluble in water

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D

They exist as oppositely charged ions even in the solid state

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Solution

The correct option is C

They are insoluble in water


Explanation:

Ionic compound: Ionic compounds are those compounds that are formed by a strong electrostatic force of attraction between oppositely charged ions.

Characteristics of Ionic compounds:

Melting point:

  • Ionic compounds are held together by a strong electrostatic force of attraction between oppositely charged ions.
  • Hence, the melting point of the ionic compound is high.

Solubility in water:

  • Ionic compounds are soluble in water. Due to the high dielectric constant of water, Ionic compounds dissolved in water and dissociate into its ions.
  • Example: Sodium chloride(NaCl) is an ionic compound that dissolves in water.

Existence in the solid state:

  • Ionic compounds exist as ions in solid-state.
  • Example: A NaCl crystal is composed of Na+ and Cl- ions in which each Na+ is surrounded by six Cl- and vice-versa.

Conduction of electricity:

  • Due to the presence of ions in the aqueous and molten state, ionic compounds conduct electricity.

Hence, option (C) is correct.


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