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 A cell is prepared by dipping a chromium rod in 1M Cr2(SO4)3 solution and an iron rod in 1M FeSO4 solution. The standard reduction potentials of Chromium and Iron electrodes are -0.75 V and -0.45 V respectively. What will be the standard EMF of the cell?
  • a)
    +0.30 V
  • b)
    +0.47 V
  • c)
    – 0.30 V
  • d)
    -0.47 V
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
A cell is prepared by dipping a chromium rod in 1M Cr2(SO4)3solution a...
Reduction potential of fe is more than that of cr, so fe will reduce and act as cathode and cr will act as anode. now emf of cell is reduction potential of cathode - reduction potential of anode. so EMF= -0.45-(-0.75) = 0.3 V
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Community Answer
A cell is prepared by dipping a chromium rod in 1M Cr2(SO4)3solution a...
Given:
Standard reduction potential of Chromium electrode (Cr3+ + 3e- → Cr): -0.75 V
Standard reduction potential of Iron electrode (Fe2+ + 2e- → Fe): -0.45 V

To find:
Standard EMF of the cell

Explanation:
The standard EMF of a cell can be calculated using the Nernst equation:

Ecell = E°cathode - E°anode

Where:
Ecell = Standard EMF of the cell
E°cathode = Standard reduction potential of the cathode
E°anode = Standard reduction potential of the anode

In this case, Chromium is the cathode and Iron is the anode. So, we have:

E°cathode = -0.75 V
E°anode = -0.45 V

Substituting these values in the Nernst equation:

Ecell = (-0.45 V) - (-0.75 V)
Ecell = -0.45 V + 0.75 V

Ecell = 0.30 V

Therefore, the standard EMF of the cell is 0.30 V.

Therefore, option A is the correct answer.
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A cell is prepared by dipping a chromium rod in 1M Cr2(SO4)3solution and an iron rod in 1M FeSO4solution. The standard reduction potentials of Chromium and Iron electrodes are -0.75 V and -0.45 V respectively. What will be the standard EMF of the cell?a)+0.30 Vb)+0.47 Vc)– 0.30 Vd)-0.47 VCorrect answer is option 'A'. Can you explain this answer?
Question Description
A cell is prepared by dipping a chromium rod in 1M Cr2(SO4)3solution and an iron rod in 1M FeSO4solution. The standard reduction potentials of Chromium and Iron electrodes are -0.75 V and -0.45 V respectively. What will be the standard EMF of the cell?a)+0.30 Vb)+0.47 Vc)– 0.30 Vd)-0.47 VCorrect answer is option 'A'. Can you explain this answer? for Class 11 2024 is part of Class 11 preparation. The Question and answers have been prepared according to the Class 11 exam syllabus. Information about A cell is prepared by dipping a chromium rod in 1M Cr2(SO4)3solution and an iron rod in 1M FeSO4solution. The standard reduction potentials of Chromium and Iron electrodes are -0.75 V and -0.45 V respectively. What will be the standard EMF of the cell?a)+0.30 Vb)+0.47 Vc)– 0.30 Vd)-0.47 VCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 11 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A cell is prepared by dipping a chromium rod in 1M Cr2(SO4)3solution and an iron rod in 1M FeSO4solution. The standard reduction potentials of Chromium and Iron electrodes are -0.75 V and -0.45 V respectively. What will be the standard EMF of the cell?a)+0.30 Vb)+0.47 Vc)– 0.30 Vd)-0.47 VCorrect answer is option 'A'. Can you explain this answer?.
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