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Isolation of Elements Test 6

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Isolation of Elements Test 6
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Weekly Quiz Competition
  • Question 1
    1 / -0

    Cryolite is the chief ore of

    Solution

    The correct answer is Option A.
    It was historically used as an ore of aluminium and later in the electrolytic processing of the aluminium-rich oxide ore bauxite (itself a combination of aluminium oxide minerals such as gibbsite, boehmite and diaspore).

  • Question 2
    1 / -0

     Composition of Siderite is

  • Question 3
    1 / -0

    Calamine is the ore of

    Solution

    The correct answer is Option B.

    Calamine is an ore of zinc. It is zinc carbonate ZnCO3.

  • Question 4
    1 / -0

    Malachite is an ore of:

    Solution

    The correct answer is Option A.
    Malachite is a green copper carbonate hydroxide mineral with formula Cu2(CO3)(OH)2. It is of minor importance today as an ore of copper because it is usually found in small quantities and can be sold for higher prices for other types of use.

  • Question 5
    1 / -0

    When a metal is to be extracted from its ore and if the gangue associated with the ore is silica ,then

    Solution

    Correct Answer is option D
     
    (Acidic Impurity) SiO2+ (Basic Flux) CaO→ (Slag) CaSiO3

  • Question 6
    1 / -0

     Roasting is done generally in case of the

    Solution

    In this process sulphide ores are converted into oxide ores
    2ZnS + 3O2 → 2ZnO + 2SO2

  • Question 7
    1 / -0

    The metal always found in free state is

    Solution

    The correct answer is Option C.

    A native metal is any metal that is found in its metallic form, either pure or as an alloy, in nature.
    For example, gold.
    Gold exists as it is less reactive and does not form any kind of alloys in its natural state.

  • Question 8
    1 / -0

    Bauxite is the chief ore of:

    Solution

    The correct answer is option D
    Aluminium
    Bauxite is the most important ore of aluminium which contains only 30–54% alumina, Al2O3; the rest is a mixture of silica, various iron oxides, and titanium dioxide along with trace amounts of zinc, phosphorus, nickel, vanadium etc.
     

  • Question 9
    1 / -0

    Dolomite is a mineral of

    Solution

    The correct answer is Option D.
    Dolomite : CaMg(CO3)2
    It contains both calcium and magnesium.

  • Question 10
    1 / -0

    Pyrolusite is a/an

    Solution

    The answer is option B
    Pyrolusite is MnO2. Thus, it is an oxide ore. It is a black, amorphous appearing mineral, often with a granular, fibrous or columnar structure, sometimes forming reniform crusts.

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