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Materials Metals and Non Metals Test - 11

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Materials Metals and Non Metals Test - 11
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  • Question 1
    1 / -0

    When non-metals combine with oxygen, what do they produce?

    Solution

    Non-metals form two types of oxides, they can be acidic or neutral oxides.

  • Question 2
    1 / -0

    Identify the oxide of a non-metal which is neutral.

    Solution

    Some oxides of non-metals are neutral. e.g., CO.

  • Question 3
    1 / -0

    Phosphorus combines with oxygen to form oxides. How many types of oxides are formed by it?

    Solution

    Phosphorus combines with oxygen and forms two oxides phosphorus trioxide and phosphorus pentoxide.

  • Question 4
    1 / -0

    Which of the following dissolves in water to form sulphuric acid?

    Solution

    Acidic oxides dissolve in water and form acids. Sulphur trioxide (SO3) reacts with water and produces sulphuric acid (H2SO4) SO3 + H2O → H2SO4

  • Question 5
    1 / -0

    Which of the following compounds is used to make photographic films?

    Solution

    Silver bromide, a compound of silver is used to make photographic films. When light falls on the film, it sets up a reaction which changes silver bromide to silver

  • Question 6
    1 / -0

    Which material is used for making crucibles?

    Solution

    Crucibles are used in the laboratory to perform high temperature reactions. They should resist high heating (they should not break). For this purpose, a mixture of graphite (an allotrope of carbon) and clay is used to make crucibles.

  • Question 7
    1 / -0

    Which non-metal is used in the treatment of rubber during the process of vulcani-sation?

    Solution

    Sulphur is used in the process of vulcanization. Rubber when treated with sulphur becomes harder than ordinary rubber, so it is used to make tyres.

  • Question 8
    1 / -0

    Which of the following is called a noble metal?

    Solution

    Gold, silver and platinum do not combine readily with other elements to form compounds, so they are called noble metals.

  • Question 9
    1 / -0

    Identify the metal which is soft.

    Solution

    Sodium has less density, hence it is soft and can be cut even with a knife.

  • Question 10
    1 / -0

    Why is tungsten used as a filament in electric bulbs?

    Solution

    Metal tungsten is used as a filament in electric bulbs because it has a high melting point.

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