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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

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

Mark ‘T’ if the statement is true and ‘F’ if it is false.

Generally, non-metals react with acids. ( )


Give reasons for the following.

Copper cannot displace zinc from its salt solution.


What happens when Dilute sulphuric acid is poured on a copper plate?

Write word equations of the reactions involved.


State five uses of metals


What is an alloy? Give two examples of alloys.


Mention two uses of the following metals and non-metals 

Iodine    


Name a metal which is best conductor of electricity :  


State two important uses of following metal: 

Uses of silver  


State two important uses of following metal 

Uses of zinc  


State two important uses of following metal 

Uses of lead     


State the position of the following in the periodic table:

Iron and zinc


When a copper coin is dipped in silver nitrate solution, a glitter appears on the coin after some time. Why does this happen? Write the chemical equation.


State why telegraph poles are painted with aluminium paint.


On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.

A white crystalline solid which decrepitates on heating leaving a residue which fuses with the glass and evolves two gases one of which is coloured and acidic.


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.

The electronic configurations of three elements X, Y and Z are X – 2, 8; Y – 2, 8, 7 and Z – 2, 8, 2. Which of the following is correct?


______ is the first scientist who used the term element.


Match the following

i. Silica a. Caustic potash
ii. Potassium hydroxide b. Sand
iii. Sodium hydroxide c. Calamine
iv. Zinc carbonate d. Caustic soda

Why are metalloids called semimetals?


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