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

संबंधित प्रश्‍न

What is an alloy?


What are alloys?


What special name is given to the corrosion of iron?


Fill in the following blank with suitable word:
The process of depositing a thin layer of zinc on iron articles is called .............


What is corrosion?


What is the corrosion of iron known as?


Explain why, when a copper object remains in damp air for a considerable time, a green coating is formed on its surface. What is this process known as?


 Name a common metal which is highly resistant to corrosion.


Bronze is an alloy of ______.


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.


No chemical reaction takes place when granules of a solid, A, are mixed with the powder of another solid, B. However when the mixture is heated, a reaction takes place between its components. One of the products, C, is a metal and settles down in the molten state while the other product, D, floats over it. It was observed that the reaction is highly exothermic.

(i) Based on the given information make an assumption about A and B and write a chemical equation for the chemical reaction indicating the conditions of reaction, physical state of reactants and products and thermal status of reaction.

(ii) Mention any two types of reactions under which above chemical reaction can be classified.


Observe the following picture a write down the chemical reaction with the explanation.


Write scientific reasons.

Lemon or tamarind is used for cleaning copper vessels turned greenish.


Answer the following question.
a) What is meant by corrosion?
b) Write names of any two methods of prevention of corrosion.
c) In which method, metal like copper, aluminium are coated with a thin layer of their oxides by means of electrolysis.
d) Explain this method with diagram.


What is ‘rusting’?


Answer the following question.

List two properties of alloys.


Give reason.

An iron article should be given a coat of paint


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.

Either oxygen or moisture is essential for rusting.


Write a short note on Alloying.


_______ is an alloy made from iron, carbon and chromium.


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


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


Write the name.

Method used to prevent corrosion of copper.


Write scientific reason.

On exposure to air, silver articles turn blackish after some time.


Complete flow chart given below.


State two conditions necessary for rusting of iron.


Generally, when metals are treated with mineral acids, hydrogen gas is liberated but when metals (except Mn and Mg), treated with HNO3, hydrogen is not liberated, why?


Iron pillar near the Qutub Minar in Delhi is famous for the following facts. Which of these facts is responsible for its long stability?


Galvanisation is a process used to prevent the rusting of which of the following?


Explain the following:

Lime water turns milky on passing carbon dioxide gas into it.


Gold plated ornaments is the example of ______.


In ______ process a layer of molten tin is deposited on metals.


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


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