मराठी
सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

Give a Reason Why a Green Deposit is Seen on the Surface of an Article of Copper

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प्रश्न

Give a reason why a green deposit is seen on the surface of an article of copper

एका वाक्यात उत्तर
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उत्तर

The green deposit of the surface of the articles made of copper is seen due to the formation of green copper carbonate.

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पाठ 6: Metals and Non-metals - Exercise

संबंधित प्रश्‍न

The atomic number of an element Y is 16.

  1. What must an atom of Y do to achieve the nearest inert gas electron arrangement?
  2. Which inert gas is nearest to Y?

What is an alloy?


What elements are present in steel?


A metal with melting point less than 50°C is


A metal which is neither ductile nor malleable is


Write ‘True’ or ‘False’ in front of following statement. 

Magnesium is used in making light weight alloys of aluminium. 


State two important uses of following metal. 

Uses of copper  


Write name.

Molecular formula of the common ore of aluminium.


 Match the alloys given in column I to the uses given in column II : 

Column I Column II
(i) Duralumin  A. Electrical fuse
(ii) Solder B. Surgical instruments 
(iii) Brass  C. Aircraft body 
(iv) Stainless Steel   D. Decorative articles

 


With reference to the following metal state its use in daily life:

Magnesium


Name the following:

The most reactive halogen.


Electronic configuration of metal A is 2,8,1. Electronic configuration of metal B is 2,8,8,2. Which of the above metals is more reactive? Explain with reason.


Assertion: Mercury is solid in room temperature.

Reason: Mercury is a non-metal.


Can you store pickle in an aluminium utensil? Give reason.


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 of the following two combinations are correct?

 

  Metal Gas Evolved
(i) Copper Yes
(ii) Iron Yes
(iii) Magnesium No
(iv) Zinc Yes

______ is the first scientist who used the term element.


Which of the following is not a metal?


Why do metals appear shiny?


Why are metalloids called semimetals?


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