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CHEMISTRY [2 Mark Question Answer]

Metals and Non-metals · ICSE STD 7 (ICSE - English Medium). 11 questions.

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[2 Mark Question Answer]

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11 questions · timed · auto-graded

Question 12 Marks
Give two uses ofGermanium
Answer
  • Germanium is used as a semiconductor.
  • It is used as a transistor in many electronic applications when mixed with arsenic, gallium, antiomony, etc.
  • Germanium is also used to form alloys and as a phosphor in fluorescent lamps
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Question 22 Marks
Give two uses ofTungsten
Answer
  • It is used in making electrodes.
  • It is used in heating elements.
  • It is used as filaments in electric bulbs and cathode ray tubes.
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Question 32 Marks
Give two uses ofAntimony
Answer
  • Antimony is used in electric industry to make semiconductor devices.
  • It is alloyed with lead to improve its hardness and strength and is used in batteries.
  • It is also used in printing presses as type metal.
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Question 42 Marks
Give two uses ofSilicon
Answer
  • Highly pure silicon is used in making microchips for computers, transistors, solar cells, rectifiers and other solid state devices that are used extensively in the electronic and present space age industries.
  • It is used in the manufacture of a waterproof material called “silicone”. Silicone is used to make bags, umbrellas, raincoats, etc.
  • It is an important substance present in steel, an alloy of carbon.
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Question 52 Marks
What are metalloids?
Answer
Metalloids are the elements which show some properties of metals and some properties of non-metals. They all are solids. They are silicon, boron, arsenic, antimony, germanium, tellurium and polonium.
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Question 62 Marks
State the composition and two uses of given alloy:
Bronze
Answer
Bronze :It is an alloy of 80% copper, 10% zinc and 10% tin.
Uses of bronze :
  • It is used for making statues.
  • It is used for making household utensils.
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Question 72 Marks
State the composition and two uses of given alloy:
Brass
Answer
Brass :It is an alloy of 40% to 20% zinc and 60% to 80% copper.
Uses of brass :
  • It is used for making tap and electric switches,
  • It is used for making household utensils.
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Question 82 Marks
State the composition and two uses of given alloy:
Duralumin
Answer
Duralumin :It is an alloy of 95% aluminium, 4% copper, 0.5% manganese and 0.5% magnesium.
Uses ofDuralumin:
  • It is used for making aircraft frames.
  • It is used for making household articles.
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Question 92 Marks
State the composition and two uses of given alloy:
Stainless steel
Answer
Stainless steel: It is an alloy of 83% iron, 1% carbon, 15% chromium and 1% nickel.
Uses of stainless steel :
  • It is used for making household utensils.
  • It is used for making surgical instruments.
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Question 102 Marks
Why are alloys made?
Answer
Pure metals generally do not have all the properties of a good metal, such as malleability, ductility, tensile strength, hardness, resistance to corrosion etc. Hence, alloys are made to enhance these properties. An alloy will have a better quality than the individual metals (or a non-metal) that form it.
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Question 112 Marks
What is an amalgam? How does an amalgam different from an alloy?
Answer
An amalgam is a homogeneous mixture of a metal in mercury whereas an alloy is a homogeneous mixture of two or more molten metals (or a non-metal) generally made for improving one or more properties of metals.
Example:When sodium dissolves in mercury, it forms sodium amalgam.
When zinc and copper are combined, alloy named brass is formed.
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[2 Mark Question Answer] - CHEMISTRY STD 7 Questions - Vidyadip