The structures of beryllium chloride in solid state and vapour phase, are :

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Question

The structures of beryllium chloride in solid state and vapour phase, are :

Accepted Answer

Correct Answer: B — Chain and dimer, respectivelyStep-by-step Solution:In the solid state, BeCl2 adopts a polymeric chain structure in which each Be atom is tetrahedrally surrounded by four Cl atoms through bridging chlorides (sp3 hybridisation). In the vapour phase, the polymer breaks down and BeCl2 exists as a dimer (Be2Cl4) with chlorine bridges. At very high temperatures, the dimer further dissociates into linear monomeric BeCl2 (sp hybridisation). Since the question asks for solid and vapour phases respectively, the answer is chain and dimer.Why other options are incorrect: Option A (chain in both) ignores the change in structure in the vapour phase. Option C (linear in both) is incorrect as the solid is polymeric, not linear. Option D reverses the order.Key Concept: BeCl2 is electron-deficient. In solid state: polymeric chain (sp3). In vapour phase: dimer Be2Cl4. At high temperature: linear monomer (sp). The bridging is due to the tendency of Be to complete its octet.

The structures of beryllium chloride in solid state and vapour phase, are :

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The structures of beryllium chloride in solid state and vapour phase, are :

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