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MDCAT
Chemistry
2021

Chemistry · Electrochemistry

Work through this past-paper style MCQ, then read the full explanation. Practice more chemistry questions on mMCQ with adaptive practice and topic analytics.

Question

Electrons in a Voltaic Cell flow from ---------- to -----------

Options
  • A

    Cathode, Anode

  • B

    Anode, Cathode

  • C

    Right, Left

  • D

    None of these

Explanation

In a Voltaic Cell, also known as a galvanic cell, electrons flow from the anode to the cathode. At the anode, oxidation occurs, meaning electrons are lost, leading to an excess of electrons that create an electron flow toward the cathode. At the cathode, reduction takes place, where electrons are gained. This movement of electrons generates an electric current that can be used to perform work. Options that suggest electrons flow from cathode to anode or in any directional terms (like right or left) do not accurately describe the electrochemical processes occurring in the cell.

This option is incorrect. In a Voltaic Cell, electrons do not flow from the cathode to the anode. The cathode is the site of reduction where electrons are gained.

In a Voltaic Cell, which is also known as a galvanic cell, electrons flow from the anode to the cathode. The anode is where oxidation occurs, meaning it's the site where electrons are lost as a substance is oxidized. This creates an electron surplus at the anode.

On the other hand, the cathode is where reduction occurs. Reduction involves gaining electrons, so the cathode becomes the site where electrons are gained. This balances out the electron flow that started at the anode.

Overall, the movement of electrons from the anode to the cathode creates an electric current that can be harnessed to do useful work, such as powering electronic devices.

This option is incorrect as it does not correctly describe the flow of electrons in terms of electrode terminology. Electron flow is based on oxidation and reduction, not directional terms like right or left.

This option is incorrect because the correct description of electron flow in a Voltaic Cell is indeed provided in the option 'Anode, Cathode'.

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Tagged under Chemistry · Electrochemistry · 2021