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discuss the diagonal relationship between Be and Al

Posted by Jay Patel 7 years, 1 month ago

CBSE > Class 11 > Chemistry

1 answers

Naveen Sharma 7 years, 1 month ago

Ans. The ionic radius of Be²⁺ is estimated to be 31 pm : the charge/ radius ratio is nearly the same as that of the Al³⁺ion. Hence beryllium resembles aluminium in some ways. Some of the similarities are:

Like aluminum, beryllium is not readily attacked by acids because of the presence of an oxide film on the surface of the metal.
Beryllium hydroxide dissolves in excess of alkali to give a beryllate ion, just as aluminium hydroxide gives aluminate ion.
The chlorides of both beryllium and aluminium have Cl- bridged chloride structure in vapour phase. Both the chlorides are soluble in organic solvents and are strong Lewis acids. They are used as Friedel Craft catalysts.
Beryllium and aluminium ions have strong tendency to form complexes.

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