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

Which of the following method is used to prevent the accumulation of greenish layer on brass due to corrosion? - Science and Technology 1

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प्रश्न

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

पर्याय

  • electroplating

  • anodization

  • tinning

  • alloying

MCQ
रिकाम्या जागा भरा
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उत्तर

tinning

shaalaa.com
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 8: Metallugy - Choose the correct option.

संबंधित प्रश्‍न

Give two examples of alloys with their chemical composition.


Write two methods of preventing the rusting of iron.


Answer the following question.

What are alloys?


What is meant by galvanisation? Why is it done?


State two conditions for the rusting of iron.


Fill in the following blanks with suitable words:
Tiffin boxes are electroplated with .............. but car bumpers are electroplated with ............... to protect them from rusting.


What is meant by 'rusting of iron'? 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 special properties of stainless steel?


Name an alloy of copper. State its chemical composition and any one use.


A common metal which is highly resistant to corrosion is:
(a) iron
(b) copper
(c) aluminium
(d) magnesium


In stainless steel alloy, iron metal is mixed with:
(a) Cu and Cr
(b) Cr and Ni
(c) Cr and Sn
(d) Cu and Ni


No chemical reaction takes place when granules of a rusty-brown 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.
(a) What could the solids A and B be?
(b) What are the products C and D most likely to be?
(c) Write the chemical equation for the reaction between A and B leading to the formation of C and D. Mention the physical states of all the reactants and products in this equation and indicate the heat change which takes place.
(d) What is the special name of such a reaction? State one use of such a reaction.
(e) Name any two types of chemical reactions under which the above reaction can be classified.


Mention two uses of the following metals and non-metals  

Iron 


Bronze is an alloy of ______.


Name the metal which is a constituent of plant pigment?


Identify the process shown in the diagram and explain it in short


Choose the correct alternative and rewrite the following:

Iron is _____________________.


Answer the following question.

List two properties of alloys.


Give reason.

An iron article should be given a coat of paint


Give reason.

A wooden article should be polished.


Give a reason why rust turns moist red litmus blue.


Corrosion of silver causes a black layer of _______.


 _______ 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 : ______


Find the odd one out and give its explanation.


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?

Give preventive methods by giving examples of corrosion?


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


What is rust?


Give the equation for the formation of rust.


State two conditions necessary for rusting of iron.


Galvanisation is a method of protecting iron from rusting by coating it with a thin layer of ____________.


The diagram shows the reaction between metal and dil. acid.

What is the reason for different behaviour of Mg in test tube B?


Marble’s popularity began in ancient Rome and Greece, where white and off-white marble were used to construct a variety of structures, from hand-held sculptures to massive pillars and buildings.

The substance not likely to contain CaCO3 is:


Explain the following:

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


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