Why are ionic solids hard and brittle?

Why are ionic solids hard and brittle?
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Ionic solids are brittle and hard as they are bonded with electrostatic bonds.
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The following type of bonding is strongly directional in solids. (A) Vander Waal's (B) Ionic (C) Metallic (D) Covalent

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Which class of solids could have London Forces the attractive forces between particles in crystal lattice positions? w) ionic x) covalent y) metallic z) molecular

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