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Answers
1)When a voltage is applied across a piece of a metal, these electrons move in an orderly fashion in one direction. This flow of electrons is the current in the metal. In most other solids, electrons are tightly bound to the atoms and are not easily available to flow.
2)Tin is a non-reactive metal whereas iron is a reactive metal. If food is stored in an iron container, it might react with iron and get spoiled. Hence, tin is electroplated on iron to make cans used for storing food. Electroplating tin makes the container non-reactive and look better.
3)Pure water is not a good conductor of electricity. ... Because the electrical current is transported by the ions in solution, the conductivity increases as the concentration of ions increases. Thus conductivity increases as water dissolved ionic species.
4) No, it is not safe for the electrician to carry out electrical repairs outdoors during heavy downpour. As rainwater consists of dissolved salts, it can conduct electricity. The electrician might get electric shocks and so he should not carry out any electrical repairs during heavy downpour.
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Explanation:
1.
When a voltage is applied across a piece of a metal, these electrons move in an orderly fashion in one direction. This flow of electrons is the current in the metal. In most other solids, electrons are tightly bound to the atoms and are not easily available to flow.
2.
Tin is coated over iron to prevent iron from reacting with food. This is done because tin is less reactive than iron.
3.
No. Pure water does not conduct electricity. This is because pure water do not contain any salts. Pure water can conduct electricity when common salt is added to it, as salt solution is conducting in nature.
4.
No, it is not safe for the electrician to carry out electrical repairs outdoors during heavy downpour. As rainwater consists of dissolved salts, it can conduct electricity. The electrician might get electric shocks and so he should not carry out any electrical repairs during heavy downpour