${E_1},{E_2}$ , and ${E_3}$ are the emfs of the following three galvanic cells respectively I. Zn (s) |$Z{n^{2 + }}$ (1 M) || ${\rm{C}}{{\rm{u}}^{2 + }}$ (0.1 M) | Cu (s) II. Zn (s) |$Z{n^{2 + }}$ (1 M) || ${\rm{C}}{{\rm{u}}^{2 + }}$ (1 M) | Cu (s) III. Zn (s) | $Z{n^{2 + }}$ (0.1 M) || ${\rm{C}}{{\rm{u}}^{2 + }}$ (1 M) | Cu (s) Which one of the following is true?

NEET UG CHEMISTRY MCQ: ELECTRO CHEMISTRY

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{E_1},{E_2}

, and

{E_3}

are the emfs of the following three galvanic cells respectively
I. Zn (s) |

Z{n^{2 + }}

(1 M) ||

\mathrm{C}{\mathrm{u}^{2 + }}

(0.1 M) | Cu (s)
II. Zn (s) |

Z{n^{2 + }}

(1 M) ||

\mathrm{C}{\mathrm{u}^{2 + }}

(1 M) | Cu (s)
III. Zn (s) |

Z{n^{2 + }}

(0.1 M) ||

\mathrm{C}{\mathrm{u}^{2 + }}

(1 M) | Cu (s)
Which one of the following is true?

View answer and explanation

Correct option: D

{E_3} > {E_2} > {E_1}

Option D (

{E_3} > {E_2} > {E_1}

) is correct because, based on the Nernst equation, increasing the concentration of reactants and decreasing the concentration of products increases the cell emf.

NEET UG CHEMISTRY MCQ: ELECTRO CHEMISTRY

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