Download App

metals and non-metals — Science STD 10 — Question

Gujarat BoardEnglish MediumSTD 10Sciencemetals and non-metals3 Marks
Question
Write a note on 'alloy'.
✓

Answer

  • Alloying is a method of improving the properties of metal and get desired properties in metal.
  • For example, iron is the most widely used metal; but it is never used in its pure state; because pure iron is very soft and stretches easily when it is hot.
  • But, if it is mixed with a small amount of carbon (about $0.05 \%$), it becomes hard and strong.
  • When iron is mixed with nickel and chromium, then we get stainless steel which is hard and does not rust.
  • When iron is mixed with some other substances (metals) its properties change.
  • In fact, the properties of any metal can be changed if it is mixed with some other substance.
  • The substance added may be a metal or a non-metal.
  • An alloy is a homogenous mixture of two or more metals or a metal and a non-metal.
  • It is prepared by first melting the primary metal and then dissolving the other elements in it in definite proportions.
  • It is then cooled to room temperature.
  • In an alloy, if one of the metal is mercury, then the alloy is known as an amalgam.
  • For example, $Zn - Hg$ (Zinc amalgam).
  • The electrical conductivity and melting point of an alloy are less than that of pure metals.
  • For example, brass is an alloy of copper $(Cu)$ and zinc $(Zn)$; while, bronze is an alloy of copper $(Cu)$ and tin $(Sn)$.
  • Bronze is not good conductor of electricity but copper $(Cu)$ and tin $(Sn)$ possess good electrical conductivity.
  • Similarly, solder, an alloy of lead and tin ($Pb$ and $Sn$), has a low melting point and is used for welding electrical wires together.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "[3 Mark Questions]" from metals and non-metals→metals and non-metals — all question types→Science STD 10 question papers→Gujarat Board STD 10 question papers→Gujarat Board question paper generator→

Similar questions

What is a neutralisation reaction? Give examples.
→
Why the creation of only DNA copy is not sufficient for cell division?###Explain : Cell reproduction
→
Using an example of electric bulb, explain how electric heating is used to produce light.
→
Five solutions A, B, C, D and E, when tested with universal indicator showed pH as 4, 1, 11, 7 and 9 respectively. Which solution is...
(a) neutral?  (b) strongly alkaline?  (c) strongly  acidic ?  (d) weakly acidic?  (e) weakly alkaline?
Arrange the pH in increasing order of hydrogen-ion concentration.
→
How is the movement of leaves of the sensitive plant different from the movement of a shoot towards light?
→
Cell division is not only for generating copy of $DNA$. Why?
→
Write a note on 'Rancidity'.
→
Write a short note: Alloy
→
Describe the activity to show that the colours of white light splitted by a glass prism can be recombined to get white light by another identical glass prism. Also draw ray diagram to show the recombination of the spectrum of white light.
→
A test was conducted in the laboratory to find the pH of different cold drinks. Draw the observation table to collect the data for this experiment and predict the result for the same.
→