For the conditions of electroplating why does the electrolyte must contain ions of the metal to be electroplated.

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Solution

In electroplating the ions of one metal are electrically deposited on to another, this is possible only when the ions of the metal which is to be deposited are in solution as they have to migrate and reach the surface of other metal and get reduced.

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Assertion: Metal ions must be present in a solution used for electroplating a particular metal.

Reason: Electroplating occurs only on anode.

Q. Which of the following options are correct about electroplating?

i. The article to be electroplated is always placed at the anode.

ii. The electrolyte must contain ions of the metal which is to be plated on the article.

iii. A higher current for a shorter time should be used.

iv. A direct current should be used instead of an alternating current.

[1 mark]

Which of the following metals cannot be used to be electroplated on the surface of another metal using an aqueous electrolyte?

During electroplating of nickel on a substance, AQUEOUS NiSO_{4 is taken as electrolyte}and current is passed . According to our book, the Ni²⁺ ions migrate to the cathode and take 2 electrons forming Ni metal on the cathode . Also, the Ni anode get decomposed as Ni²⁺ ions.

But, at the cathode, H+ ions must go and undergo reduction by gaining ions because H+ is lower than Ni2+ in the electrochemical series and H+ can gain electrons more readily because of its small atomic size. Then why Ni+2 ions go to cathode and undergo reduction?

Or should MOLTEN NiSO4 be taken as an electrolyte for electroplating of Nickel on a metal so that there are no H⁺ ions in the electrolyte and only Ni²⁺ ions go at cathode and get deposited on the metal ?

Q. Assertion :Silver nitrate is used as the electrolyte in silver electroplating. Reason: An electrolytic solution is a liquid or gel which contains ions and can be decomposed by electrolysis.

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