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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 7

State a Specific Reason for Using Copper in Electrical Cables - Chemistry

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प्रश्न

State a specific reason for using copper in electrical cables

एक पंक्ति में उत्तर
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उत्तर

Copper is used in electrical cables because it is a good conductor of electricity.

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अध्याय 6: Metals and Non-metals - Exercise

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संबंधित प्रश्न

Give reasons for the following.

Sodium and potassium are stored in kerosene.


What happens when Iron nails are placed in copper sulphate solution?

Write word equations of the reactions involved.


State one use of Copper.


State one use of Mercury.


The atomic number of an element Y is 16.
(a) What must an atom of Y do to achieve the nearest inert gas electron arrangement?
(b) Which inert gas is nearest to Y?


Give the composition of an alloy called solder. State its one property and one use.


What is an alloy? How is an alloy made?


What is meant by 22 carat gold? Name the metals which are usually alloyed with gold to make it harder.


Statements given below are incorrect. Write the correct statements : 

Aluminium is best conductor of electricity.   


State two important uses of following metals: 

Uses of iron   


Write the name.

Two highly reactive metals-


When a copper coin is dipped in the solution of silver nitrate, it shows a lustre on its surface. Explain this process with the help of a chemical equation.


Compare the properties of metals and nonmetals. Give three examples for each.


Why are bells made of metals?


Give reasons for the following.

  1. Aluminum foils are used to wrap food items.
  2. Immersion rods for heating liquids are made up of metallic substances.
  3. Sodium and potassium are stored in kerosene.
  4. Mercury is used in thermometers.

A is a reddish-brown metal, which combines with O2 at < 1370 K gives B, a black coloured compound. At a temperature > 1370 K, A gives C which is red in colour. Find A, B, and C with reaction.


Which one of the following four metals would be displaced from the solution of its salts by other three metals?


Which metals are not solid at room temperature?


Why are metalloids called semimetals?


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