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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 7

State Two Important Uses of Following Metal : Uses of Gold - Chemistry

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प्रश्न

State two important uses of following metal: 

Uses of gold  

एक पंक्ति में उत्तर
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उत्तर

Uses of gold :

  • It is used for making jewellery and coins.
  • It is used in dentistry for filling cavities in teeth
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अध्याय 6: Metals and Non-metals - Additional questions 2

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सेलिना Concise Chemistry [English] Class 7 ICSE
अध्याय 6 Metals and Non-metals
Additional questions 2 | Q 3.01

संबंधित प्रश्न

Give reasons for the following.

Sodium and potassium are stored in kerosene.


State one use of Copper.


Name two alloys of iron. What elements are present in these alloys?


Explain how, a reduction reaction of aluminium can be used for welding cracked machine parts of iron. Write a chemical equation for the reaction involved.


How does the electrical conductivity of copper alloys, brass and bronze, differ from that of pure copper?


Write ‘true’ or ‘false’ for the following statement : 

Silver is used to make electric cables.


Fill in the blank spaces by choosing the correct words from the given list.
List: amalgam, chlorine, gallium, sodium chloride, silver chloride 

A solution of a metal in mercury is called ________


Statements given below are incorrect. Write the correct statements : 

Aluminium is best conductor of electricity.   


State the position of the following in the periodic table:

Alkali metals


Write scientific reason.

Generally the ionic compounds have high melting points.


Give reasons for the following:
Most metals conduct electricity well.


Aluminium: _______: gold : : electric insulator


Halogen reacts with acid.


Which one of the following is an example for a metal?


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


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.

An element forms an oxide A2O3 which is acidic in nature. Identify A as a metal or non-metal.


Why are bells made of metals?


Why are metalloids called semimetals?


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