Q14 · CSIR-NET Chemistry, December 2018
Paper: CSIR-NET December 2018 · Subject: Physical Chemistry · Chapter: Electrochemistry · Topic: Electrochemistry – General · Marks: 2 · Difficulty: Hard
The standard free energy of the reaction \[ \mathrm{AgBr}(s) \rightarrow \mathrm{Ag}^{+}(a q)+\mathrm{Br}^{-}(a q) \]
Is closest to. \[ \left[E^{o}\left(\mathrm{AgBr} / \mathrm{Ag}, \mathrm{Br}^{-}\right)=0.07 \mathrm{V} ; E^{o}\left(\mathrm{Ag} / \mathrm{Ag}^{+}\right)=0.80 \mathrm{V} ; \mathrm{F}=96500 \mathrm{C} \mathrm{mol}^{-1}\right] \]
(a)$7 \mathrm{kJ} \mathrm{mol}^{-1}$
(b)$70 \mathrm{J} \mathrm{mol}^{-1}$
(c)$70 \mathrm{kJ} \mathrm{mol}^{-1}$
(d)$7 \mathrm{J} \mathrm{mol}^{-1}$
Answer
Answer: C ✓ checked by 4AB · confidence high
Explanation
E°cell = 0.07 − 0.80 = −0.73 V; ΔG° = −nFE° = 96500 × 0.73 ≈ +70 kJ mol⁻¹ (c).
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