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Solution


Q.

Identify the correct order of standard enthalpy of formation of sodium halides.              [2023]
1 NaCl < NaF < NaBr < NaI  
2 NaI < NaBr < NaCl < NaF  
3 NaF < NaCl < NaBr < NaI  
4 NaI < NaBr < NaF < NaCl  

Ans.

(2)

Compound  ΔHr (kJ/mol)
NaF      –569
NaCl      –400
NaBr      –360
NaI       –288

For sodium metal, ΔHf always becomes less negative from fluoride to iodide.