The temperature coefficient of emf of a cell designed as Zn -1 M Zn 2-0-1 M - Cu 2- Cu is -1-4 - 10-4 V per degree- Change in entropy for the reaction Zn -0-1 M Cu 2- Zn 1 M 2- Cu at 27- C is- E cell -1-1 V A- 14 JB- 27 JC- -14 JD- -27 J

The correct option is D 27 JΔ S=nFdE_cell/dT|_p=2× 96500( 1.4×10^ 4)= 27.02J nbsp; ...

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Gibb's Free Energy

The temperatu...

Question

The temperature coefficient of emf of a cell designed as $Z n | Z n^{2 +} (1 M) | | C u^{2 +} (0.1 M) | C u$ is $- 1.4 \times 10^{- 4} V$ per degree. Change in entropy for the reaction $Z n + C u^{2 +} 0.1 M ⇌ Z n^{2 +} 1 M + C u$ at $27^{\circ} C$ is: $(E_{c e l l}^{\circ} = 1.1 V)$

14 J

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27 J

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-14 J

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-27 J

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Z n | Z n^{2 +} (1 M) | | C u^{2 +} (0.1 M) | C u

- 1.4 \times 10^{- 4} V

Z n + C u^{2 +} 0.1 M ⇌ Z n^{2 +} 1 M + C u

27^{\circ} C

(E_{c e l l}^{\circ} = 1.1 V)

E_{1}, E_{2}, E_{3}

Z n | Z n_{1 M}^{2 +} | | C u_{0.1 M}^{2 +} | C u

Z n | Z n_{1 M}^{2 +} | | C u_{1 M}^{2 +} | C u

Z n | Z n_{0.1 M}^{2 +} | | C u_{1 M}^{2 +} | C u

Below given are emf of three galvanic cells, represented by $E_{1}$ , $E_{2}$ and $E_{3}$ . Which of the following is true?

I. $Z n | Z n^{2 +} (1 M) | | C u^{2 +} (1 M) | C u$

II. $Z n | Z n^{2 +} (0.1 M) | | C u^{2 +} (1 M) | C u$

III. $Z n | Z n^{2 +} (1 M) | | C u^{2 +} (0.1 M) | C u$

E_{1}, E_{2}

E_{3}

Z n | Z n^{2 +} (1 M) | | C u^{2 +} (1 M) | C u

Z n | Z n^{2 +} (0.1 M) | | C u^{2 +} (1 M) | C u

Z n | Z n^{2 +} (1 M) | | C u^{2 +} (0.1 M) | C u

Z n + C u^{2 +} (0.1 M) \to Z n^{2 +} (1 M) + C u

27^{o} C

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