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Identify the correct order of standard enthalpy of formation of sodium halides [JEE Main 2023, 13 Apr (Shift 2)]

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Identify the correct order of standard enthalpy of formation of sodium halides

[JEE Main 2023, 13 Apr (Shift 2)]

a

\(NaI < NaBr < NaCl < NaF\)

b

\(NaF < NaCl < NaBr < NaI\)

c

\(NaCl < NaF < NaBr < NaI\)

d

\(NaI < NaBr < NaF < NaCl\)

✓ Correct answer: a)

\(NaI < NaBr < NaCl < NaF\)

Explanation

For a given metal \(\Delta_{ f } H ^0\) always becomes less negative from fluoride to iodide. Therefore correct order of standard enthalpy of formation of \(NaX\) is \(Na I < NaBr\) \(< NaCl < NaF\)

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