- What is used in lead storage battery?
- Which of the following concentrations decrease as the lead-acid storage battery is discharged?
- What is reduced in a graphite dry cell battery?
- What are the advantage of dry cells?
- How do you minimize polarization in a simple cell?
- How do I minimize local action?
- How the local action in simple voltaic cell is prevented?
- What is the role of mno2 in a dry cell?
- What is the emf of a voltaic cell?
- What will be the EMF of a working electrochemical cell?
What is used in lead storage battery?
In the charged state, each cell contains negative plates of elemental lead (Pb) and positive plates of lead(IV) oxide (PbO2) in an electrolyte of approximately 4.2 M sulfuric acid (H2SO4).
Which of the following concentrations decrease as the lead-acid storage battery is discharged?
The density of an electrolyte in a lead storage battery decreases as it is discharged.
What is reduced in a graphite dry cell battery?
For a dry-cell battery to operate, oxidation will occur from the zinc anode and reduction will take place in the cathode. The most common type of cathode is a carbon graphite. Once reactants have been turned into products, the dry-cell battery will work to produce electricity.
What are the advantage of dry cells?
Advantages of a dry cell are:
- The compact size of a dry cell makes it suitable for powering small electronic devices.
- The electrolyte used in dry cell is relatively not so harmful to the environment.
- Dry cells are inexpensive.
How do you minimize polarization in a simple cell?
Manganese dioxide is added to reduce polarization when current flows and zinc chloride reduces local action when the cell is not being used.
How do I minimize local action?
Local action can be minimized using a pure zinc electrode that has no impurities embedded in it. But it is a very expensive option. Therefore, a cheaper option is used where zinc is alloyed with mercury to produce zinc amalgam. The process is called amalgamation.
How the local action in simple voltaic cell is prevented?
Local Action : This is caused by the impurities present in zinc rod. When the zinc rod isimmersed in acid, the zinc atoms and the impurity atoms form a large number of local cells and the zinc rod gets consumed even when the cell is not in use. This defect can be avoided by using amalgamated zinc rods.
What is the role of mno2 in a dry cell?
Manganese dioxide present in dry cell improves the performance of the cell by absorbing the hydrogen gas produced. Function of charcoal: Charcoal reduces the internal resistance of the cell.
What is the emf of a voltaic cell?
The electromotive force (EMF) is the maximum potential difference between two electrodes of a galvanic or voltaic cell. If the cell potential is negative, the reaction is reversed. In this case, the electrode of the galvanic cell should be written in a reversed order.
What will be the EMF of a working electrochemical cell?
The electromotive force of a cell or EMF of a cell is the maximum potential difference between two electrodes of a cell. It can also be defined as the net voltage between the oxidation and reduction half-reactions. The EMF of a cell is mainly used to determine whether an electrochemical cell is galvanic or not.