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Which one of the following statements is correct?

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Beryllium exhibits a coordination number of six

Chlorides of both beryllium and aluminum have bridged chloride structure in solid phase

$B_{2} H_{6} \cdot 2 N H_{3}$ is known as inorganic benzene.

Boric acid is protonic acid.

answer is B.

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Detailed Solution

We know, beryllium exhibits a maximum coordination number of four.

$B_{3} N_{3} H_{6}$ is an inorganic benzene but not $B_{2} H_{6} \cdot 2 N H_{3}$ .

The acid which donates its proton is called protonic acid. Boric acid does not donate its proton rather it’s donated from the water molecule. Hence, it’s a Lewis acid not protonic acid.

Chlorides of aluminum and beryllium forms a bridge-like structure in the solid phase. This statement is true.

Therefore, option (B) is correct.

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