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Class 11 – chemistry Chapter 10: electrochemistry

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    Class 11 – chemistry Chapter 10: electrochemistry


    Class 11 – chemistry

    Chapter 10: electrochemistry
    Give short answers:

    Q1. What is electrolysis?
    Ans. Electrolysis is a process in which electricity is passed through an electrolyte and the electrolyte decomposes during this process. Conductivity of the solution of an electrolyte and electrolyte is due to the mobility of its ions. The quantity of electricity which passes through the solution of an electrolyte is directly related to the number of ions present in the solution. During electrolysis electric current is passed through molten or solution form of a compound. Positively charged particles move towards anode. In case of electrolysis of molten sodium chloride sodium ions move towards cathode while chloride ions move towards anode. Sodium and chlorine gas are the products of this electrolysis. While in case of electrolysis of aqueous sodium chloride, chloride ions move towards anode but sodium ions remain in solution, instead water molecules reduced at cathode. That is why products of electrolysis of aqueous sodium chloride are chlorine, hydrogen and sodium hydroxide solution.

    Q2. Name few standard electrodes.
    Ans. Electrode potentials are measured using standard electrodes. Standard electrodes used for this purpose are standard hydrogen electrode and calomel reference electrode.

    Q3. How you will define an electrode?
    Ans. Electrode is any metal suspended in a solution of its ions. Concentration of the same metal ions is kept one mole per liter. If electrode potential of this metal is measured at room temperature pressure, this potential is called its standard reduction potential or standard oxidation potential.

    Q4. What is EMF?
    Ans. Electromotive force or emf is the force responsible for pushing electrons from anode to cathode is known as electromotive force and is measured in volts. The emf of the galvanic cell is known as cell potential. It depends upon the nature and concentration of ions, temperature and pressure. If the concentration of ions is IM, temperature is 25 degree C and partial pressure of gases is one atmosphere, the cell potential is known as standard cell potential.

    Q5. What do you mean by SHE?
    Ans. Standard hydrogen electrode consists of platinum foil which is coated with a layer of finally divided platinum. The foil is connected with a platinum wire and is surrounded by a glass tube having a connected tube for the entry of hydrogen gas (1atm). This standard hydrogen electrode is then immersed in IM HCl solution. Potential of SHE is accepted as zero volt at all temperature.

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