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

Observe the following diagram and write answers. 1. Name the method. 2. Explain the method. 3. Give two examples of this method.

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प्रश्न

Observe the following diagram and write answers.

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

  1. The method is called electroplating.
  2. Explanation:
    a. Electroplating is the process in which a less reactive metal is coated on a more reactive metal by electrolysis.
    b. It protects the object made of reactive metal from corrosion. c. It also improves the appearance of the object.
  3. Silver plated spoons, gold plated ornaments are examples of electroplating.
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पाठ 8: Metallugy - Answer the Following

संबंधित प्रश्‍न

Tinning : Tin : : Galvanizing : _________


What are alloys?


Which of the following methods is suitable for preventing an iron frying pan from rusting?


Give reasons:

Platinum, gold and silver are used to make jewellery.


Explain why, iron sheets are coated with zinc.


The corrosion of copper produces a ______ coating of basic copper carbonate on its surface.


______ and ______ are necessary for the rusting of iron.


Name any two metals which do not corrode easily.


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.


Name five methods of preventing rusting of iron.


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?


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


Bronze is an alloy of ______.


Name the metal which is a constituent of blood pigment?


Corrosion can be an advantage in some case.Explain ?


Explain with reason:

Roasting is carried out on sulphide ores and not on carbonate ores.


Answer the following question.

List two properties of alloys.


Give reason.

A wooden article should be polished.


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.


Which of the following method is used to prevent the accumulation of greenish layer on brass due to corrosion?


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 a molecular formula for rust.


State two conditions necessary for rusting of iron.


Which among the following alloys contain mercury as one of its constituents?


Alloys are homogeneous mixtures of a metal with a metal or non-metal. Which among the following alloys contain non-metal as one of its constituents?


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?


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


State whether the following statement is true or false:

Ships suffer a lot of damage though they are painted.


Gold plated ornaments is the example of ______.


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