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Metals and Non-metals Test - 30

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Metals and Non-metals Test - 30
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  • Question 1
    1 / -0
    Zinc sulphate forms a colourless solution in water. The colour on adding copper is:
    Solution
    There will be no change in colour as copper(Cu) is less reactive metal than zinc(Zn) and thus can not displace the latter from $$ZnSO_{4}$$ solution.
  • Question 2
    1 / -0
    The reactivity of iron, magnesium, sodium and zinc towards water are in order as:
    Solution
    Reactivity series is a list of metals arranged in decreasing order of their reactivity or activity based on displacement reactions conducted experimentally. It follows the order:
    $$Na>Ca>Mg>Al>Zn>Fe$$
    Thus, option $$C$$ is correct.
  • Question 3
    1 / -0
    Which of the following reacts with cold water vigorously?
    Solution
    Sodium is a light and soft metal that reacts vigorously with cold water. The reaction is so violent and exothermic that the evolved hydrogen gas immediately catches fire.

    $$2Na+2H_2O \rightarrow 2NaOH +H_2$$
  • Question 4
    1 / -0
    The correct order of increasing chemical reactivity is :
    Solution
    The reactivity series is a series in which metals are arranged in decreasing order of their reactivities.
    $$Fe<Zn<Mg<K$$
    In the reactivity series, the most active metal is at the top of the series.
  • Question 5
    1 / -0
    Which of the following metals can displace the other three metals from their salt solutions?
    Solution
    The reactivity series follows the order:
    $$Al>Zn>Fe>Pb>H>Cu$$

    Thus, aluminum is above the other metals given and is more reactive to them and thus, can displace them from their salt solution.
  • Question 6
    1 / -0
    To protect iron from corrosion and rust, it is coated by :
    Solution
    To protect the iron from corrosion and rust, it is coated with zinc. Rusting of iron is an oxidation process in which iron gets oxidized in the presence of air and moisture for a long period of time. It is protected by applying a coat of zinc. The zinc protects iron by corroding first, i.e zinc oxidizes before iron metal thus preventing it from rusting.

    Therefore, option C is correct.

  • Question 7
    1 / -0
    Identify the metal which reacts with concentrated $$H_2SO_4$$ or $$HNO_3$$, but not with concentrated HCl.
    Solution
    Cu metal reacts with concentrated $$H_2SO_4$$ or$$HNO_3$$ but it doesn't react with dilute HCl
  • Question 8
    1 / -0
    Metals are usually hard and difficult to cut.
    On the other hand, non-metals are usually brittle. When hit with a hammer, they break into small pieces.

    Identify the element that is relatively more brittle from the options below:
    Solution
    Diamond and Sulphur are the non-metals from the options given. However, diamond is an exception - it is one of the hardest substance on Earth and can't be broken easily.
    Therefore, option $$A$$ is correct.
  • Question 9
    1 / -0
    A solid compound "A" consists of simple ions. The nature of the bond present in "A" will be:
    Solution
    Compound "A" is solid and contains ions. So, there are electrostatic forces between the ions, which results in an ionic bond.
    Option A is correct.
  • Question 10
    1 / -0
    Ionic compounds are more likely to be soluble in:
    Solution
    We know that "like dissolves like". Ionic compounds being polar are more likely to be soluble in a polar solvent such as water. 
    Kerosene, oil, and petrol are non-polar solvents and, hence, are not likely to dissolve ionic compounds in them.
    Thus option $$A$$ is correct.
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