JEE Main · 2022 · Shift-ImediumEC-089

The ( E T)P of different types of half cells are as follows: | Half cell | A | B | C | D | |---|---|---|---|---| | ( E…

Electrochemistry · Class 12 · JEE Main Previous Year Question

Question

The (∂E∂T)P\left(\frac{\partial E}{\partial T}\right)_P of different types of half cells are as follows:

| Half cell | A | B | C | D | |---|---|---|---|---| | (∂E∂T)P\left(\frac{\partial E}{\partial T}\right)_P | 1×10−41 \times 10^{-4} | 2×10−42 \times 10^{-4} | 0.1×10−40.1 \times 10^{-4} | 0.2×10−40.2 \times 10^{-4} |

(Where E is the electromotive for\ce). Which of the above half cells would be preferred to be used as referen\ce electrode?

Options
  1. a

    A

  2. b

    B

  3. c

    C

    ✓
  4. d

    D

Correct Answerc

C

Detailed Solution

Strategy: A referen\ce electrode must provide a stable potential that does not fluctuate with environmental changes like temperature. Therefore, the temperature coefficient (partialE/partialT)P(partial E / partial T)_P must be as small as possible.

Comparison of coefficients:

  • A: 1.0×10−41.0 \times 10^{-4}
  • B: 2.0×10−42.0 \times 10^{-4}
  • C: 0.1×10−40.1 \times 10^{-4} (Smallest)
  • D: 0.2×10−40.2 \times 10^{-4}

Conclusion: Half-cell C has the least sensitivity to temperature variations, making it the most reliable for referen\ce purposes.

Answer: (c) C\boxed{\text{Answer: (c) C}}

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