Electrolysis:Applications

Electrolysis is the process of decomposition of an electrolyte (in molten or in aqueous state) by passing electric current. It results in discharge of ions of electrolyte at the electrodes. The electrodes (anode and cathode) are two conducting rods immersed in electrolyte through which current enters and leaves the electrolytic cell. There are various applications of electrolysis such as electroplating of metals, electrorefining of metals, electrometallurgy. Electroplating is an electrolytic process by which a thin film of a non-reactive and superior metal is deposited on an article made of more reactive and inferior metal. The non-reactive and superior metals commonly used for electroplating include gold (Au), silver (Ag), nickel (Ni), chromium (Cr) etc. In electrorefining, metals containing impurities are purified electrolytically to give pure metal. This method is used for the refining of metal like copper, silver, gold, zinc, aluminium, etc. The process of extraction of metals from its ores by electrolysis is called electrometallurgy. The highly electropositive metals like potassium (K), sodium (Na), calcium (Ca), magnesium (Mg), aluminium (Al) etc. are extracted by electrolysis.

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  • Q1

    When silver is plated on a copper article, then anode is made up of

    Marks:1
    Answer:

    silver.

    Explanation:

    During electroplating of a copper article with silver, anode is made of a plate or a rod of pure silver and cathode is made of highly cleaned copper article.

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  • Q2

    The metals extracted from their fused ores using electrolysis are

    Marks:1
    Answer:

    Na and K.

    Explanation:

    Na and K are highly electropositive metals. Hence, they can be extracted from their fused ores by electrolysis.

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  • Q3

    Following diagram represents elctrorefining of copper:

    X, Y and Z are

    Marks:1
    Answer:

    pure copper, impure copper and copper sulphate solution respectively.

    Explanation:

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  • Q4

    The process of electrolytic deposition of a superior metal (non–reactive) on an inferior metal (reactive) is known as

    Marks:1
    Answer:

    elctroplating.

    Explanation:

    Electroplating is an electrolytic process in which an inferior metal is coated with a thin layer of a superior metal.

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  • Q5

    The electrolyte used when a brass spoon is electroplated with nickel is

    Marks:1
    Answer:

    NiSO4 solution.

    Explanation:

    A saturated aqueous solution of nickel sulphate acidified with sulphuric acid is used as electrolyte for the electroplating of a brass spoon with nickel.

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