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JEE Main · 2008 · 27 Apr 2008 · Offline · p-Block Elements

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Which one of the following is the correct statement?
  1. (A)Boric acid is a protonic acid
  2. (B)Beryllium exhibits coordination number of six
  3. (C)Chlorides of both beryllium and aluminium have bridged chloride structures in solid phase✓ Correct
  4. (D) is known as 'inorganic benzene'

Answer: (C)

Solution

Of the statements offered, the sound one is that the chlorides of both beryllium and aluminium adopt bridged-chloride structures in the solid: beryllium chloride forms long chains held together by chlorine bridges, and aluminium chloride associates through bridging chlorines as well. The others fail, since boric acid is a Lewis rather than a protonic acid, beryllium is too small to reach a coordination number of six, and the true inorganic benzene is borazine rather than the ammonia adduct of diborane.

JEE Main · 2008 · 27 Apr 2008 · Offline · Single correct option

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