English
Maharashtra State BoardSSC (English Medium) 10th Standard

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

Advertisements
Advertisements

Question

Observe the following diagram and write answers.

  1. Name the method.
  2. Explain the method.
  3. Give two examples of this method.
Short/Brief Note
Advertisements

Solution

  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.
shaalaa.com
  Is there an error in this question or solution?
Chapter 8: Metallugy - Answer the Following [Page 41]

APPEARS IN

RELATED QUESTIONS

Give two examples of alloys with their chemical composition.


Write two methods of preventing the rusting of iron.


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 how painting of an iron gate prevents it from rusting.


Explain the term “corrosion” with an example. Write a chemical equation to show the process of corrosion of iron.


Name any two metals which do not corrode easily.


What is the corrosion of iron known as?


Name five methods of preventing rusting of iron.


What are the special properties of stainless steel?


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


Name a common metal which is highly resistant to corrosion.


If copper is kept exposed to damp air for a considerable time, it gets a green coating on its surface. This is due to the formation of ______.


A metal X which is resistant to corrosion is produced by the electrolysis of its molten oxide whereas another metal Y which is also resistant to corrosion is produced by the reduction of its oxide with carbon. Metal X can be used in powder form in thermite welding whereas metal Y is used in making cathodes of ordinary dry cells.

  1. Name the metals X and Y.
  2. Which of the two metals is more reactive: X or Y?
  3. Name one ore or metal X. Also write its chemical formula.
  4. Name one ore of metal Y. Also write its chemical formula.
  5. Name one alloy of metal X and one alloy of metal Y.

Corrosion can be an advantage in some case.Explain ?


Explain with reason:

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


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.


What are the adverse effects of corrosion?


What is ‘rusting’?


Answer the following question.

List two properties of alloys.


Give a reason why rust turns moist red litmus blue.


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


 _______ forms a green colour in the water.


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


Pressure cooker : Anodizing : : Silver plated spoons : _______


Rusting of iron : Fe2O3 : : corrosion of copper : ______


Draw a neat labelled diagram.

Anodizing


Observe the following diagram and give answers.

  1. Name this method of prevention of corrosion.
  2. For prevention of which metal this method is used?
  3. What is used as anode in this method?

Observe the following figure and write the answer of the question.

  1. Which process is shown in the figure?
  2. Explain the chemical reaction shown in the figure.
  3. Write the reactions on anode and cathode.

The process of coating the surface of the metal with a thin layer of zinc is called ______


Give the equation for the formation of rust.


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?


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.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×