Chemical effects of electric current - Electronics and Communication Engineering (ECE) PDF Download

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FAQs on Chemical effects of electric current - Electronics and Communication Engineering (ECE)

1. What are the chemical effects of electric current?
Ans. The chemical effects of electric current refer to the changes that occur in chemical substances when an electric current passes through them. These effects include electrolysis, electroplating, and chemical decomposition.
2. How does electrolysis occur due to electric current?
Ans. Electrolysis occurs when an electric current is passed through an electrolyte solution or molten electrolyte. The current causes the positive ions (cations) to move towards the negative electrode (cathode) and the negative ions (anions) to move towards the positive electrode (anode). This movement of ions results in the decomposition of the electrolyte into its constituent elements.
3. What is electroplating and how is it related to the chemical effects of electric current?
Ans. Electroplating is a process in which a metal object is coated with a thin layer of another metal using the chemical effects of electric current. It involves placing the object to be plated (the cathode) in a solution containing ions of the metal to be deposited. When an electric current is passed through the solution, the metal ions are reduced and deposited onto the object, forming a uniform and protective coating.
4. How can the chemical effects of electric current be used in practical applications?
Ans. The chemical effects of electric current have various practical applications. For example, electrolysis is used to extract metals from their ores, electroplating is used to enhance the appearance and corrosion resistance of objects, and electrorefining is used to purify metals. Additionally, electrochemical cells and batteries are based on the chemical effects of electric current.
5. What happens during chemical decomposition caused by electric current?
Ans. Chemical decomposition occurs when an electric current passes through a compound, causing it to break down into its constituent elements or ions. This process is commonly observed in electrolysis, where the compound is dissociated into its positive and negative ions. The amount of decomposition depends on factors such as the strength of the current, the concentration of the electrolyte, and the duration of the current flow.
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