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JEE Main 2022 · 26 Jun · Shift 1, Chemistry question 65

The (∂E∂T)P\left(\dfrac{\partial E}{\partial T}\right)_P of different types of half cells are as follows :
ABCD1×10−42×10−40.1×10−40.2×10−4\begin{array}{cccc}A&B&C&D\\1\times10^{-4}&2\times10^{-4}&0.1\times10^{-4}&0.2\times10^{-4}\end{array}
(Where E is the electromotive force)

Which of the above half cells would be preferred to be used as reference electrode ?

Choose one option
Answer and worked solution

Official answer: C

Reference electrode needs a potential that barely changes with temperature: the smallest (∂E∂T)P\left(\frac{\partial E}{\partial T}\right)_P, half cell C.

(C)

Topics:Gibbs energy and EMFGalvanic cells and EMF
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