मराठी
महाराष्ट्र राज्य शिक्षण मंडळएस.एस.सी (इंग्रजी माध्यम) इयत्ता १० वी

Write scientific reason. Anodization method is useful for prevention of the corrosion of the aluminium.

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प्रश्न

Write scientific reason.

Anodization method is useful for prevention of the corrosion of the aluminium.

थोडक्यात उत्तर
स्पष्ट करा
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उत्तर

  1. The process of coating metals such as aluminium and copper with a thin and strong layer of their oxides by electrolysis is called anodizing process.
  2. When aluminium is anodized, a thin layer of aluminium oxide is formed all over the surface. This restricts the contact of aluminium metal with oxygen and water and prevents corrosion of aluminium.
    Hence, anodization method is useful for prevention of the corrosion of the aluminium.
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पाठ 8: Metallugy - Write scientific reasons [पृष्ठ २४]

संबंधित प्रश्‍न

What are alloys?


Give reasons:

Platinum, gold and silver are used to make jewellery.


Explain how painting of an iron gate prevents it from rusting.


Explain why Iron sheets are coated with zinc during galvanization.


What special name is given to the corrosion of iron?


What is meant by galvanisation? Why is it done?


In one method of rust prevention, the iron is not coated with anything. Which is this method?


The corrosion of iron is called ______.


The process of depositing a thin layer of zinc on iron articles is called ______.


Why is an iron grill painted frequently?


Explain why, though aluminium is more reactive than iron, yet there is less corrosion of aluminium when both are exposed to air.


What is the corrosion of iron known as?


With the help of labelled diagrams, describe an activity to find out the conditions under which iron rusts.


Name two metals which resist corrosion due to the formation of a thin, hard and impervious layer of oxide on their surface.


What are the constituents of stainless steel?


Explain why, the galvanised iron article is protected against rusting even if the zinc layer is broken.


In stainless steel alloy, iron metal is mixed with ______.


Four metals P, Q, R and S are all obtained by the reduction of their oxides with carbon. Metal P is used to form a thin layer over the sheets of metal S to prevent its corrosion. Metal Q is used for electroplating tiffin boxes made of metal S whereas metal R is used in making car batteries. Metals Q and R form an alloy called solder. What are metals P, Q, R and S? How have you arrived at this conclusion?


Explain how the activity series accounts for each of the following:

tendency to corrosion


What is corrosion? What are necessary conditions for corrosion?


Compare roasting and calcination.


Choose the correct alternative and rewrite the following:

Iron is _____________________.


Explain the term – rusting and give a word equation for the formation of rust. If polished iron nails are kept in three separate test tubes, state the contents in each test tube required, to prove the conditions for rusting.


State whether the statement given below is true or false. If false write the correct statement.

Graphite is a lustrous non-metal which conducts electricity.


Write a short note on Alloying.


Corrosion of silver causes a black layer of _______.


To prevent corrosion of iron and steel _______ method is used.


When one of the metals in an alloy is mercury the alloy is called _______.


Draw a neat labelled diagram.

Electrolysis


Complete flow chart given below.


Observe the following diagram and write answers.

  1. Name the method.
  2. Explain the method.
  3. Give two examples of this method.

Identify the correct statement from the following:


Explain the following:

Bubbles are produced when acetic acid is added to a solution of sodium hydrogencarbonate. 


Describe two changes that are harmful. Explain why you consider them harmful. How can you prevent them?


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