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In metals, the mobile charge carriers are the electrons, in an ionized gas, they are electrons and positive ions; in electrolytes, these are both positive and negative ions. In a semiconductor such as Ge or Si, conduction is partly duer to electrons and partly due to holes which are site..

Which of the following pairs of activities could be used to illustrate the commutative property? => putting on your right shoe and putting on your left shoe or Open the book, and read the content or pick up the mobile and talk or washes clothes and dries them..

A strong electrolyte dissociates or ionises completely or almost completely to form free mobile ions in the solution or molten form. The more the availability of free mobile ions in an electrolyte, the greater is its capacity to carry or conduct current i.e. the stronger the el..

The absence or deficiency (not present in the required amount) of any of the essential elements leads to deficiency symptoms. The symptoms develop as hunger signs in the plants and can be studied by hydroponics or water culture or soil-less culture. In hydroponics, large volume of nutrient solution..

Electrovalent substances are made up of ions in the solid state. The oppositely charged ions are held together by strong electrostatic (coulombic) force of attraction. Due to these forces the ions cannot move (Fig. 4.2..

A weak electrolyte ionises or dissociates only partially to form free mobile ions. Most of the electrolyte remains as un-ionised molecules. For example in acetic acid, the number of its dissociated ions (the acetate and hydrogen ions) is less compared to the total amount of acetic acid mo..

Action of Heat on Sulphur - When heated, sulphur undergoes a series of characteristic changes. Sulphur can melt at two different temperatures. a) If heated rapidly, it melts at 112.8 o C. b) But if heated slowly it will melt only at 118.6 o C. Roll sulphur is rhombic. When heated it slowly changes ..

'. This explanation is also responsible for its name electron sea model. Thus, the simultaneous force of attraction between the mobile electrons and the positive kernels that binds the metal atoms together, is known as metallic bon..

The cells discussed above use a liquid electrolyte, one cathode and an anode. Some of the major disadvantages of these cells are leakage on long term storage, corrosion due to the use of liquid acidic/alkaline solution, short life, low weightage per kg mass of the cell and limit on miniaturization...

The mixture to be separated is taken in a suitable solvent and the solution is poured on the top of the column of the adsorbent. It is allowed to pass slowly through it and as it passes through the column the different constituents of the mixture get adsorbed to different extent, forming bands in ..