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General Principles and Processes of Isolation of Elements Test - 4

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General Principles and Processes of Isolation of Elements Test - 4
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  • Question 1
    1 / -0

    Which technique utilizes the density difference between the ore and the impurity to concentrate the ore is

    Solution

    This is based on the differences in gravities of the ore and the gangue particles. It is therefore a type of gravity separation. In one such process, an upward stream of running water is used to wash the powdered ore. The lighter gangue particles are washed away and the heavier ores are left behind.

  • Question 2
    1 / -0

    Gravity separation technique is mainly applicable to

    Solution

    Gravity separation is a technique mainly used for concentration of tin and lead ores as they are heavier.

  • Question 3
    1 / -0

    Which process is usually applied for separating gangue from sulphide ores?

    Solution

    Sulphide ores are concentrated using Froth floatation.

  • Question 4
    1 / -0

    The impurity that is added externally to remove the impurity already present in the ore is known as

    Solution

    Flux is externally added substance to an ore, which combines with impurities in the ore to form Slag which can be easily separated.

  • Question 5
    1 / -0

    Conversion of ore to oxide is generally carried out by the process of

    Solution

    Calcination is employed for carbonate ores to convert into respective oxide ores. Roasting is employed for sulphide ores for conversion to oxide ores.

  • Question 6
    1 / -0

    Pyrometallurgy is the process of

    Solution

    It is branch of science and technology concerned with the use of high temperatures to extract and purify metals.

  • Question 7
    1 / -0

    The process in which the concentrated ore is heated to a high temperature in the absence of air is known as

    Solution

    Carbonate ore is heated to a high temperature for decomposition of carbonates in the absence of air, this process is known as calcination.

  • Question 8
    1 / -0

    What is the temperature of zone of slag formation?

    Solution

    During extraction of Fe, slag is formed in the temperature range of 1000-1300oC.

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