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Isolation of El...

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  • Question 1
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    Flux is often added to remove impurities from an iron ore in a blast furnace. In the reaction slag and flux are

    CaO + SiO2 →CaSiO3 

    The slag and the flux are

     

  • Question 2
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    Froth flotation process is based on

  • Question 3
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    Which one of the following ores is concentrated by chemical leaching method?

  • Question 4
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    Which of the ore dressing process requires finest size of ore?

  • Question 5
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    Wolframite(FeWO4) impurities present in cassiterite (SnO2) can be separated by the process of

  • Question 6
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    In the metallurgical process, the flux used for removing acidic impurities is

  • Question 7
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    Gravity method of ore concentration depends on

  • Question 8
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    Sulphide ores of metals are usually concentrated by froth floatation process.Which one of the following sulphide ores offers an exception and  is concentrated by leaching?

  • Question 9
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    The slag formed in the extraction of iron from haematite in the blast furnace is:

  • Question 10
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    In the froth floatation process for benefaction of the ores, the ore particles float because

  • Question 11
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    Heating ore with carbon in the absence of air is known as:

     

  • Question 12
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    In the extraction of copper from sulphide ore, the metal is formed by reduction of Cu2O with

     

  • Question 13
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    The method of zone refining of metals is based upon the principle of

     

  • Question 14
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    The common impurities found in bauxite are

     

  • Question 15
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    Cassiterite is the ore of which metal?

  • Question 16
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    Comprehension Type

    This section contains a passage describing theory, experiments, data, etc. Two questions related to the paragraph have been given. Each question has only one correct answer out of the given 4 options (a), (b), (c) and (d).

    Passage

    Most of the ores available in nature contain large amount of impurities i.e. gangue. The pretreatment of ores, based on physical properties and without bringing out any major chemical change in the ore is called ore dressing or ore concentration.

    Q. Which of the following is related to ore concentration?

  • Question 17
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    Most of the ores available in nature contain large amount of impurities i.e. gangue. The pretreatment of ores, based on physical properties and without bringing out any major chemical change in the ore is called ore dressing or ore concentration.

    Q. 

    In the purification of bauxite by leaching, the chemicals employed in Baeyer’s and Hall’s process respectively are

  • Question 18
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    Matching List Type

    Choices for the correct combination of elements from Column I and Column II are given as options (a), (b), (c) and (d), out of which one is correct.

    Q. 

    Match the Column I with Column II and mark the correct option from the codes given below.

  • Question 19
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    Match the Column I with Column II and mark the correct option from the codes given below.

  • Question 20
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    In electrorefining of copper some gold is produced as:

  • Question 21
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    In the electrolytic method of obtaining aluminium from purified bauxite, cryolite is added to the charge in order to:

     

  • Question 22
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    The purest form of iron is:

  • Question 23
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    During the process of electrolytic refining of copper, some metals present as impurity settle as ‘anode mud’. These are:

     

  • Question 24
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    Extraction of zinc from zinc blende is achieved by

  • Question 25
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    In the extraction of nickel by Mond’s process, the metal is obtained by

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