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Very Short Answer Type Questions
1. Do liquids also conduct electricity ?
2. Name two liquids which conduct electricity and two liquids which do not conduct electricity,
3. Name a device which glows even when a weak electric current passes through it.
While the full form of LED
5. How would you classify lemon juice - a good conductor or a poor conductor of electricity ?
6. Vinegar is a sour liquid State whether vinegar will conduct electricity or not.
7. What effect does an electric current produce when flowing through a conducting liquid (or conducting
solution)?
8. When electric current is passed through acidified water, then hydrogen and oxygen are formed. What
type of effect of current is illustrated by this statement ?
9. Acidified water is electrolysed by using carbon electrodes. What is produced at: (a) positive carbon
electrode ? (b) negative carbon electrode ?
10. Give one example of the chemical effect of electric current
11. What should be done to decompose water into hydrogen and oxygen ?
12. Name the process in which a coating of one metal can be deposited on the surface of another metal by
using current from a battery
13. Name the metal which is usually electroplated on car parts such as bumpers and bicycle handlebars made
of steel
14. Which metal is electroplated on iron for making 'cans' used for storing food ?
15. Name two metal objects which have a coating of another metal.
16. Name the most common application of the chemical effect of electric current
17. Name two metals which are usually electroplated on cheaper metals for making jewellery (or ornaments)
18. Which is the polluting waste generated by electroplating factories?
19. Give a list of five objects around you which are electroplated.
20. Name two metals which are purified by using the chemical effect of current (or electrolysis).
21. Name to metals which are produced (or extracted) by using the chemical effect of electric current
22. Name one chemical compound which is produced by using the chemical effect of electric current.
1. Name one compound which is decomposed into hydrogen and oxygen by using the chemical effect of
electric current.
24. State whether the following statements are true or false :
(a) Rainwater is a non-conductor of electricity
(b) A piece of fresh potato does not conduct electricity at all.
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Answers
Answer:
Answers=
1.Explain that some liquids can conduct electricity like metal wires because they have tiny particles called ions that carry the electricity through the liquid. Some solids when added to liquids can form these ions and the solution will conduct electricity.
2.Name two liquids which conduct electricity and two liquids which do not conduct electricity. Solution: Tap water and lemon water conducts electricity. Distilled water and wine do not conduct electricity because it does not contain free ions.
3.A Light Emitting Diode glows even a weak current passes through it.
4.Light-emitting diode
5.Lemon juice contains citric acid. Because acids break up into charged anions and cations when dissolved in water, they conduct electricity because the charged particles are able to flow within the acid. -Therefore,it is good conductor.
6.Vinegar is a sour liquid. State whether vinegar will conduct electricity or not. Solution: Vinegar is a poor conductor of electricity because it does not have any free ions to carry an electric charge and conduct electricity.
7.What effect does electric current produce when flowing through a conducting liquid (or conducting solution)? Solution: When an electric current passes through a conducting liquid, it gets decomposed into ions. The conducting solution has free ions available which conduct electricity.
8.For example when an electric current is passed through acidified water then bubbles of oxygen and hydrogen gases are produced at two electrodes. This is a chemical effect of electric current. As solids conduct electricity, some of the liquids like acids, bases and salts also conduct electricity.
9.During electrolysis of acidified water using carbon electrodes, O2− ions are oxidized at the positive carbon electrode (anode) and thus oxygen gas is liberated at anode.
10.When an electric current is passed through water, then water dissociates into hydrogen and oxygen. This is an example of the chemical effect of electric current.
11.This is possible using a process known as electrolysis, which involves running a current through a water sample containing some soluble electrolyte. This breaks down the water into oxygen and hydrogen, which are released separately at the two electrodes.
12.Electroplating
Electroplating is the process in which a coating of one metal can be deposited on the surface of another metal by using current from a battery. The metal that needs to be deposited is used as the cathode while the metal on which it is deposited is used as anode.
13.Chromium
Name the metal which is usually electroplated on car parts such as bumpers and bicycle handlebars made of steel. Solutions: Chromium is electroplated on car parts such as bumpers and bicycle handlebars made of steel.
14.Tin cans
Tin cans are thin electroplated on iron. These tin cans are used to preserve food items. Because tin is less reactive than iron as it will prevent food from being poisoned.
15.The zinc is plated over the iron or steel as its corrosion occurs very slowly. The gold is plated over the iron.
16.electroplating
The most common application of the chemical effect of electric current is electroplating. The process of depositing a layer of any desired metal on another material, by means of electricity, is called electroplating.
17.Gold and silver are electroplated on cheaper metals for making jewelry or ornaments.
18.The conducting solution used in the electroplating process is the waste generated by electroplating factories.
19.Pots of metals, bath taps, ornaments, rims of vehicles, handle bar of cycles and motor cycles, kitchen gas burner, bottom of cooking utensils, handles of doors, tin cans are the some objects around us that are electroplated.
20.Name two metals which are purified by using the chemical effect of current (or electrolysis). Solution: Copper and Gold are purified by using the chemical effect of current (or electrolysis).
21.Copper sulphate is one chemical compound which is produced by using the chemical effect of electric current
22.Copper sulphate
Solution: Copper sulphate is one chemical compound which is produced by using the chemical effect of electric current.
23.Water
Water is one compound which is decomposed into hydrogen and oxygen by using the chemical effect of electric current.
24.So, rainwater can conduct electricity. (b) A piece of fresh potato does not conduct electricity at all - False. A piece of fresh potato has the potential to conduct electricity because it is filled with electrolytes. These electrolytes enable the flow of electric charges, so potato is a conductor.
Explanation: