English

What are alloys?

Advertisements
Advertisements

Questions

What are alloys?

What are alloys? Give two examples.

What is meant by an ‘alloy’?

Give two examples of an ‘alloy’.

Long Answer
Short Answer
Advertisements

Solution 1

An alloy is a homogeneous mixture of two or more metals or metals and non-metals. For example, brass is an alloy of copper and zinc.

For example:

  • Stainless steel is an alloy of Nickel and Chromium.
  • Amalgam is an alloy of Mercury.
  • Brass is an alloy of Copper and Zinc.
  • Bronze is an alloy of Copper and Tin.
  • Solder is an alloy of Lead and Tin.
shaalaa.com

Solution 2

An alloy is a homogenous mixture of two or more metals or a metal and a non–metal in definite proportion.

Examples:

  1. Brass – copper, and zinc.
  2. Stainless steel – iron, nickel, and chromium
shaalaa.com

Notes

Students should refer to the answer according to their question and prreferred marks.

  Is there an error in this question or solution?
Chapter 3: Metals and Non-metals - Intext Questions [Page 55]

APPEARS IN

NCERT Science [English] Class 10
Chapter 3 Metals and Non-metals
Intext Questions | Q 15. | Page 55

Video TutorialsVIEW ALL [2]

RELATED QUESTIONS

Give two examples of alloys with their chemical composition.


Tinning : Tin : : Galvanizing : _________


Why do we apply paint on iron articles?


 Which metals do not corrode easily?


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


Explain why rusting of iron objects is faster in coastal areas than in deserts.


Explain why Iron sheets are coated with zinc during galvanization.


Choose the correct answer from the options given below:

Heating an ore in a limited supply of air or in the absence of air at a temperature just below its melting point is known as

A. Smelting

B. Ore-dressing

C. Calcination

D. Bessemerisation


What is anodising? Give its applications.


Name any three objects (or structures) which are gradually damaged by the corrosion of iron and steel.


The chemical reaction involved in the corrosion of iron metal is that of ______.


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


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


Fill in the following blanks with suitable words:
............ and .............. are necessary for the rusting of iron.


Why is an iron grill painted frequently?


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


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 five methods of preventing rusting of iron.


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


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:
(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.


Bronze is an alloy of ______.


Name the metal which is a constituent of plant pigment?


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.


Write scientific reasons.

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


Find the odd man out:


Answer the following question:
What is corrosion? Do gold ornaments corrode? Justify.


What is ‘rusting’?


Give reason.

A wooden article should be polished.


Give a reason why rust turns moist red litmus blue.


Give reason for the following:

A suspension of rust is basic in nature.


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

Either oxygen or moisture is essential for rusting.


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


Corrosion of silver causes a black layer of _______.


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


Stainless steel is an alloy of _______.


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 : ______


Bronze : _______ : : Stainless steel : Fe + Cr + C


Find the odd one out and give its explanation.


Find the odd one out and give its explanation.


Write the name.

An alloy of copper and tin-


Write the name.

Method used to prevent corrosion of copper.


Write scientific reason.

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


Write scientific reason.

Coins are made from metals and alloys.


Explain concept with example/explain with the help of a balanced equation.

Corrosion


Draw a neat labelled diagram.

Electroplating


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?

State two conditions necessary for rusting of iron.


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:


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.


Explain the following:

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


Give an example of a chemical reaction for the following situation:

Sound is produced


Give scientific reasons.

Silver amalgam is used for filling dental cavities.


Explain the chemical reactions in rusting of iron.


A process of forming a thick oxide of aluminium when aluminium is exposed to air. This coat makes it resistant to corrosion. Resistance can be improved by making a layer of oxide thinker. In this technique, the aluminium article is the anode, and the electrolyte is sulphuric acid. The anode reaction results in the formation of a black-coloured film of aluminium oxide on the anode. By putting appropriate dyes in the electrolytic solution, both coloured surface with the decorative finish is achieved. Kitchen articles like anodised such as pressure cookers, pans and frames of sliding windows are applications of this technique.
  1. Name the anode and electrolyte used in this technique.
  2. How can we make aluminium articles made resistant to corrosion?
  3. Name the technique used to coat the aluminium articles.

Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×