AP EAMCET · Chemistry · Thermodynamics (C)
Which of the following substances has highest value of standard molar enthalpy of formation at \(298 \mathrm{~K}\) ?
- A \(\mathrm{NaF}(\mathrm{s})\)
- B \(\mathrm{NaCl}(\mathrm{s})\)
- C \(\mathrm{NaBr}(\mathrm{s})\)
- D \(\mathrm{Nal}(\mathrm{s})\)
Answer & Solution
Correct Answer
(A) \(\mathrm{NaF}(\mathrm{s})\)
Step-by-step Solution
Detailed explanation
Higher the stability of a substance, higher will be its standard molar enthalpy of formation value, \(\left|\Delta_f H^{\circ}\right|\) Among the halides, \(\mathrm{F}^{-}\)is smallest and \(\mathrm{I}^{-}\)is largest in size. So, according to Fajan's rule, \(\mathrm{NaF}\) is…
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