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Yogita Ingle 6 years, 10 months ago
a2 + 6a - 91
= a2 + 13a - 7a - 91
= a( a+ 13) - 7(a + 13)
= (a + 13) (a - 7)
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Yogita Ingle 6 years, 10 months ago
Electricians avoid electrical repairing during rainy season especially outdoor because rain water composed of certain percentage of dissolved salt making it conductive. This may causes electric shock and harm electrician while working outdoor during heavy downpours.
Posted by Pinky Agarwal 6 years, 10 months ago
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Meghna Thapar 5 years, 6 months ago
Glucose (sugar) readily dissolves in water, but because it does not dissociate into ions in solution, it is considered a nonelectrolyte; solutions containing glucose do not, therefore, conduct electricity. “nonelectrolyte.” A nonelectrolyte is a compound that does not conduct an electric current in either aqueous solution or in the molten state. Many molecular compounds, such as sugar or ethanol, are nonelectrolytes. When these compounds dissolve in water, they do not produce ions.
Posted by Pinky Agarwal 6 years, 10 months ago
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Yogita Ingle 6 years, 10 months ago
The presence of ions in liquid causes the flow of current. Current is defined as the rate of change of charge and ions are charged species. The ions carrying positive charge charge are called cations and those carrying negative charge are called anions. So when the ions present in a solution move, current flows in the solution.
Posted by Pinky Agarwal 6 years, 10 months ago
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Yogita Ingle 6 years, 10 months ago
An electrolytic cell is a device which converts electric energy into chemical energy ..anode is the positive electrode and it gets its name as anode because anions migrate towards it.

Posted by Pinky Agarwal 6 years, 10 months ago
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Yogita Ingle 6 years, 10 months ago
It is the process of refining of metal in which impure metal is made the anode and a thin strip of pure metal is made the cathode. A solution of metal salt is used as an electrolyte. The apparatus is shown in the figure given below. When electric current is passed through the electrolyte, the impure metal from the anode is dissolved in the electrolyte and an equal amount of pure metal from the electrolyte is deposited on the cathode. The soluble impurities go into the solution whereas the insoluble impurities settle down at the bottom of the anode which is known as anode mud. Following diagram shows the electrolytic refining of copper in which anode is impure copper and cathode is thin strip of pure copper while the electrolyte used is the copper sulphate solution.
Posted by Pinky Agarwal 6 years, 10 months ago
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Yogita Ingle 6 years, 10 months ago
Electrolysis of common salt solution: When electricity is passed through the salt solution, four types of ions, ie, sodium, chlorine, hydrogen, hydrogen ions are produced. Hydrogen ions discharge at cathode whereas chlorine ions are discharged at the anode. Now if the electrodes are immersed in water and current is passed, bubbles of oxygen gas is liberated at cathode
Posted by Pinky Agarwal 6 years, 10 months ago
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Yogita Ingle 6 years, 10 months ago
When electric current is passed through a conducing solution, some chemical reaction takes place in the solution. This is called chemical effect of electric current. Some of the chemical effects of electric current are as follows:
- Bubbles of gas may be formed at electrodes.
- Deposits of metal may be seen on electrodes.
- Change of colour of solution may occur.
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Meghna Thapar 5 years, 11 months ago
Copper bottomed utensils are made up for cooking because copper is an excellent conductor of heat and have the highest thermal conductivity,
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Tittu Sharma 5 years, 9 months ago
1Thank You