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Question:

The structure of beryllium chloride in the solid state and vapour phase, respectively, are:

chain and chain

dimeric and dimeric

dimeric and chain

chain and dimeric

Solution:

Correct option is D. chain and dimeric
BeCl2 exists as (BeCl2)n polymeric chain in solid form, while BeCl2 exists as dimer (BeCl2)2 in vapour phase.