English

Answer the following question. What are alloys? - Science

Advertisements
Advertisements

Questions

Answer the following question.

What are alloys?

Answer the following question.

What are alloys? Give two examples

Answer in Brief
Advertisements

Solution 1

An alloy is the 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.

Example:

  1. Brass – copper, and zinc.
  2. Stainless steel – iron, nickel, and chromium
shaalaa.com
  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 3 | Page 55

Video TutorialsVIEW ALL [2]

RELATED QUESTIONS

 What special name is given to their corrosion of iron?


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:
(a) oxidation as well as displacement
(b) reduction as well as combination
(c) oxidation as well as combination
(d) reduction as well as displacement


Name the metal which is used for galvanising 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 corrosion?


Give the constituents and one use of brass.


 Name five methods of preventing rusting of iron.


What are the special properties of stainless steel?


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.


Four metals P, Q, R and S are all obtained by the reduction of their oxides with carbon. Metal P is used to form a thin layer over the sheets of metal S to prevent its corrosion. Metal Q is used for electroplating tiffin boxes made of metal S whereas metal R is used in making car batteries. Metals Q and R form an alloy called solder. What are metals P, Q, R and S? How have you arrived at this conclusion?


What is corrosion? What are necessary conditions for corrosion?


Corrosion can be an advantage in some case.Explain ?


Complete the process of iron rusting by filling the blanks. Suggest a way to prohibit the process.
The iron rust is formed due to........................... reaction. Different
regions on iron surface become anode and cathode.
 Reaction on anode region :

`F_e(s) → Fe^(2+) (aq) +2e^-`

 Reaction on anode region :

`O_2(g) + 4H^+(aq) +............................ → 2H_2 O (l) `

When Fe2+ ions migrate from anode region they react with ................... to form Fe3+ ions.
A reddish coloured hydrated oxide is formed from ............... ions. It is called rust.

`2Fe_(3+) (aq) + 4H_2O(l) → ................. + 6H_+(aq) `

A way to prevent rusting ..................................................................

 

 


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


Find the odd man out:


What is done to prevent corrosion of metals?


What are the adverse effects of corrosion?


Write three methods of preventing rusting of iron.


What is "rusting"? Describe with a labelled diagram an activity to investigate the conditions under which iron rusts.


Give reason for the following:

A suspension of rust is basic in nature.


 _______ forms a green colour in the water.


Stainless steel is an alloy of _______.


Find the odd one out and give its explanation.


Match the columns.

Group A Group B
1) Electroplating a) Pressure cooker
2) Anodising b) Silver plated spoons
  c) Coating of tin on copper
  d) Coating of Zinc on iron

Complete flow chart given below.


Write a molecular formula for rust.


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?


Identify the correct statement from the following:


Alloys are homogeneous mixtures of a metal with a metal or nonmetal. 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?


A man painted his main gate made up of iron, to

  1. prevent it from rusting.
  2. protect it from sun.
  3. make it look beautiful.
  4. make it dust free.

Which of the above statement(s) is/are correct?


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


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

Sound is produced


Explain the chemical reactions in rusting of iron.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×