Generate Quiz 68DEEAB1858CE

Since copper has a higher reduction potential than hydrogen, the copper electrode will function as a cathode and S.H.E. as an anode, allowing electrons to move from S.H.E. to the copper electrode.

Important point: S.H.E., with the exception of Cu, Ag, AU, and Pt, functions as a cathode (becomes reduced) when connected to a metal electrode.

Emf(oxidation) – Emf(reduction) yields the emf in an electrochemical cell.or Emf + Emf (oxidation + reduction)

The oxidation number increases when negatively charged electrons are lost, and decreases when negatively charged electrons are gained. As a result, the oxidized element or ion experiences an increase in oxidation number.

In the response provided:

Fe undergoes oxidation. From 0 to +3, its oxidation state shifts.

Cl is decreased. From 0 to -1, its oxidation state shifts.

A galvanic cell is created when an active metal, such as aluminum, combines with a less active element, such as copper. A galvanic cell is a kind of electrochemical cell in which two half-cells spontaneously react to produce an electric current.

The less active metal Cu will be reduced in the Al and Cu case, whereas the active metal Al will be oxidized. Electrons from the oxidation of aluminum will flow through the external circuit to reduce copper. The following is the general response:

Al(s) + Cu2+(aq) → Al3+(aq)+ Cu(s)
Devices can be powered by the voltage produced by the electrons moving through the external circuit. Batteries, flashlights, and calculators are just a few of the devices that use galvanic cells.

The electrode where reduction occurs is called the cathode. The species’ oxidation state falls and electrons are gained during reduction.

Given that fused NaCl is electrolyzed using Down’s cell, option C is accurate.

The right answer is: Each of these answers is accurate.

Any or all of the following can be used to transform a voltaic cell into a reverse galvanic cell:

Altering the electrode positions: The flow of electrons from the anode to the cathode in a voltaic cell occurs spontaneously. The anode and cathode can be switched to create a reverse galvanic cell by reversing the electron flow.

Using a wire in place of the salt bridge: The salt bridge in a voltaic cell facilitates the flow of ions between the half-cells, preserving charge neutrality. The ions’ mobility is impeded and the cell operates as a reverse galvanic cell when the salt bridge is swapped out for a conducting wire.

supplying an external power source: The chemical reactions at the electrodes of a voltaic cell produce an electric potential difference that propels the electron flow. A reverse galvanic cell is created when an external source of electricity (such as a battery or power supply) is applied in the opposite direction, forcing the cell to operate in reverse.

Therefore, a voltaic cell can be changed into a reverse galvanic cell using any of the methods listed.

The charge of an oxide ion is -2. Thus, the charge of three oxide ions will be -6.

The charge of H is +1.

Therefore, N is HNO3 will be:

-6+1+x=0

x=+5.