A student obtained the values of cohesive energy for four types of crystals as $764, 447, 108$ and $7.74 k J / m o l$ respectively. If the crystals used by him are Ar, Na, Si and $N a C l$ , then the correct correlation is :

A r - 7.74, N a - 108, S i - 764

and

N a C l - 447

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A r - 7.74, N a - 108, S i - 447

and

N a C l - 764

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A r - 108, N a - 7.74, S i - 447

and

N a C l - 7.64

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A r - 7.64, N a - 108, S i - 7.74

and

N a C l - 447

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Solution

The correct option is B $A r - 7.74, N a - 108, S i - 447$ and $N a C l - 764$ .
Argon is a noble gas with completed octet. It has minimum cohesive energy. Sodium chloride is the ionic compound. It has highest cohesive energy. Sodium is electropositive metal. It has next maximum cohesive energy. Thus, the correct correlation is $A r - 7.74, N a - 108, S i - 447$ and $N a C l - 764$

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A student obtained the values of cohesive energy for four types of crystals as 764,447,108 and 7.74kJ/mol respectively. If the crystals used by him are Ar, Na, Si and NaCl, then the correct correlation is :

A student obtained the values of cohesive energy for four types of crystals as $764, 447, 108$ and $7.74 k J / m o l$ respectively. If the crystals used by him are Ar, Na, Si and $N a C l$ , then the correct correlation is :