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General Principles and Processes of Isolation of Elements Test - 3

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General Principles and Processes of Isolation of Elements Test - 3
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  • Question 1
    1 / -0

    Metals which occur in their native state in nature

    Solution

    Native state and less reactivity is due to absence or very less tendency of them to form compounds with other elements.

  • Question 2
    1 / -0

    Metal which is found in free state is

    Solution

    Gold is very stable and least reactive metal. It did not attract or give up any electrons with other elements.

  • Question 3
    1 / -0

    Which among the following statement is correct?

    Solution

    All ores are minerals but vice versa is not true. Because ores are the minerals from which metal can be profitably extracted. There are many minerals from which we cannot extract metals profitably, so cannot be considered as ores.

  • Question 4
    1 / -0

    The most abundant metal on earth is

    Solution

    By mass, aluminium makes up about 8% of the Earth's crust; it is the third most abundant element after oxygen and silicon and the most abundant metal in the crust.

  • Question 5
    1 / -0

    The impurities associated with an ore is known as

    Solution

    Rarely an ore contains only desired substance. It is generally contaminated with earthly or non-desired materials like gangue.

  • Question 6
    1 / -0

    The common impurity present in most of the ores is

    Solution

    It is most abundantly present in earth's crust and can be found as an impurity in the ores.

  • Question 7
    1 / -0

    Which metal is also found in sea beds?

    Solution

    Manganese is found in sea beds.

  • Question 8
    1 / -0

    The sulphide ore of iron is

    Solution

    FeS2 is iron pyrites which contain sulfide group.

  • Question 9
    1 / -0

    Carbonate ore of iron is

    Solution

    FeCO3 is siderite.

  • Question 10
    1 / -0

    The process of separating gangue and other impurities from the metals is known as

    Solution

    Process of removal of impurities from ore is known as concentration of ore or beneficiation of ore.

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