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Materials Metals and Non Metals Test - 25

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Materials Metals and Non Metals Test - 25
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  • Question 1
    1 / -0
    Non-metals do not have lustre which means:
    Solution
    Non-metals do not have lustre which means that non-metals do not have a shining surface. Thus they show a dull appearance.
  • Question 2
    1 / -0
    If we dip a piece of aluminium foil in sodium hydroxide:
    Solution
    Aluminium reacts with sodium hydroxide base to liberate hydrogen gas.
  • Question 3
    1 / -0
    When a base combine with metal it forms metal salt/base and releases:
    Solution
    Metals mostly do not react with bases. However, there some metals that will react with strong bases like $$NaOH$$ and produce metal salt/base and release hydrogen gas. The presence of hydrogen gas can be examined by the pop sound.

    Zinc reacts with dilute $$NaOH$$ as follows:

    $$Zn$$ + $$2NaOH\rightarrow$$ $$H_2$$ + $$Na_2ZnO_2$$ 

    Option B is correct.
  • Question 4
    1 / -0
    The metal which is silvery light, malleable and ductile, and the boiling point is around $$2500^\circ C$$ is:
    Solution
    The metal which is silvery light, malleable and ductile and the boiling point is around $$2500 ^\circ C$$ is $$\text{aluminium}$$.
  • Question 5
    1 / -0
    A non-metal which is used for making electrode is:
    Solution
    In the case of graphite due to layer structure and weak Vander Waals force, it can conduct electricity. Due to this nature being non-metal graphite is used as an electrode.
    Hence, option C is correct.
  • Question 6
    1 / -0
    Which of the following is not used in making cooking utensils even though it is a metal?
    Solution
    Lead is a poor conductor of heat. Also, it is a poisonous metal. So, it can't be used to make cooking utensils.
  • Question 7
    1 / -0
    Which of the following non-metal is a good conductor of electricity?
  • Question 8
    1 / -0
    Metals used to make bullet proof alloy steels is:
    Solution
    Metals used to make bullet proof alloy steel is $$Titanium.$$
  • Question 9
    1 / -0
    Identify the non-lustrous element.
    Solution
    Iodine has a lustrous appearance. Bromine is a non-metal so it is non-lustrous. Silver and iron are metals and they are lustrous.
    Iodine is a non-metallic, dark-gray/purple-black, lustrous, solid element. It is non –metal and hence lustrous.
  • Question 10
    1 / -0
    Mark the correct statement.
    a) Metals lose their lustre on keeping in air.
    b) Gold is lustrous.
    c) Metals are lustrous and can be polished.
    Solution
    Metals lose their lustre when kept exposed to air for a long time and get a dull appearance.
    Gold is known for its lustrous yellow appearance.
    Lustre is a property of metals and metals can be polished to increase their metallic lustre.
    Hence, all the statements are correct.
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