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Aluminium or copper wires required for e...

Aluminium or copper wires required for electric circuits are coated with a rubber like material. Why?

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To prevent leakage of electric current and also to prevent from shocks if touched accidentally.
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ZEN PUBLICATION-METALS AND NON METALS-ZEN ADDITIONAL QUESTIONS SECTION (VERY SHORT ANSWER [VSA] TYPE QUESTIONS)
  1. Name the metal which has very low melting point and can melt with heat...

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  2. State two physical properties of gold which are of extreme use to jewe...

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  3. Aluminium or copper wires required for electric circuits are coated wi...

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  4. A non-metal X exists in two different forms Y and Z. Y is the hardest ...

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  5. Name two non metals which are brittle solids.

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  6. Reverse of the following chemical reaction is not possible: Zn(s)+Cu...

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  7. Hydrogen gas is not liberated when a metal reacts with concentrated ni...

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  8. A silver spoon is kept immersed in an aqueous solution of copper sulph...

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  9. What are ionic compounds?

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  10. Ionic compounds can conduct electric current when molten. Give reason....

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  11. Aluminium occurs in combined state in nature whereas gold, in its free...

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  12. A few drops of sulphuric acid are added to water before electrolysis. ...

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  13. In the refining of silver, the recovery of silver from silver nitrate ...

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  14. What is metallurgy ?

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  15. What is the reduction process used for sodium chloride?

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  16. In electrolytic refining of an impure coper metal, which substances ar...

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  17. What is galvanization?

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  18. Iron objects acquires redish brown coating when left exposed to moist ...

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  19. Why corrosion of iron is a serious problem?

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  20. Name the colour of coating formed on silver and copper articles expose...

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