Which of the following reactions could be used to electroplate nickel with gold? O A) Zn(s) + 2Au*(aq) --> Zn²*(aq) + 2Au(s) O B) 2Au(s) + Ni2*(ag) --> Ni(s) + 2Au*(aq) O C) 2Au(s) + Zn2"(ag) --> Zn(s) + 2Au*(aq) O D) NI(s) + 2Au (ag) --> NI2 (ag) + 2Au(s)

Q: 1- How can you prepare 5% NaOH solution ?

A: Given :  Concentration of NaOH solution = 5 %

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Q: ion oxidation state of metal atom [Mac (NH).J [Fe(OH), (co)]

A: Detail solution is given below

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Electrolysis

Electrolysis is defined as the process of breaking down ionic compounds into their constituent elements by passing a direct electric current through the compound in a fluid state. The cathode reduces cations, while the anode oxidizes anions. An electrolyte, electrodes, and some form of external power source are the main components required for conducting electrolysis. A partition, such as an ion-exchange membrane or a salt bridge, may also be used, but this is optional. These are primarily used to prevent the products from diffusing near the opposing electrode.