Self Studies
Self Studies
Self Studies
Self Studies

Isolation of Elements Test - 4

Result Self Studies

Isolation of Elements Test - 4
  • Score

    -

    out of -
  • Rank

    -

    out of -
TIME Taken - -
Self Studies

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Self Studies Self Studies
Weekly Quiz Competition
  • Question 1
    4 / -1

     

    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

     

    Solution

     

    The ores even after concentration , contain some ganghue.To remove these gangue particle cortain substance are mixed to form a fushible ore which combite with the gangue to form a fusible meterial which is not solution in molten metal . The sulstances used are called fluxed and the fasible merterial formed during reduction process is called slag
    Slag is usually lighly and thus on the surface of the moltes metal

    Flaxtes are classified as (i) acidic flox and (ii) basic , flex An acoidic flux siles bores etc is the chenical substans which removes the imparities.

     

  • Question 2
    4 / -1

    Froth flotation process is based on

    Solution

    This method is based upon the fact that the surface of sulphide over is preferentially wetted by oils while that of gangue is preferentially wetted by water.

  • Question 3
    4 / -1

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

    Solution

    In this process the finely divided powdered argentite or the native silver or gold is treated with a dilute solution (0.5%) of sodium or potassium cyanide while a current of air is continuously passed. As a result silver pass into solution forming their respective soluble complex cyanides while the impurities remain unaffected which are filtered off.

  • Question 4
    4 / -1

    Which of the ore dressing process requires finest size of ore?

    Solution

    The ore is crushed into a fine powder and mixed with water to form suspension.

  • Question 5
    4 / -1

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

    Solution

    Electromagnetic separation method of concentration is employed when either the ore or the impurities associated with it are magnetic in nature. Tinstone or cassiterite (SnO2) an ore of tin being non-magnetic can be separated from magnetic impurities (FeWO4).

  • Question 6
    4 / -1

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

    Solution

     
     

  • Question 7
    4 / -1

    Gravity method of ore concentration depends on

    Solution

    The mineral particle becom es wet by oils while the gangue particles by water. A rotating paddle agitates the mixtures and draws air in it. As a result froth is formed which carrier the mineral particles. The froth is light and is skimmed of. If is then dried for recovery of the ore particles.

  • Question 8
    4 / -1

    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?

    Solution

    Leaching This process consists in treating the powdered ore with a suitable reagent (such as acids, bases or other chemicals) which can selectively dissolves the ore but not the impuritier. It is used to extract silver metals.

  • Question 9
    4 / -1

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

    Solution


  • Question 10
    4 / -1

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

    Solution

    The ore particles preferentially wetted by the oil become lighter and thus rise to the surface along with the froth while the gangue particle wetted by wated become heavier and thus settle down at the bottom.

  • Question 11
    4 / -1

     

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

     

  • Question 12
    4 / -1

     

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

     

  • Question 13
    4 / -1

     

    The method of zone refining of metals is based upon the principle of

     

  • Question 14
    4 / -1

     

    The common impurities found in bauxite are

     

    Solution

     

    The common impurities present in bauxite is Fe2O3.

     

  • Question 15
    4 / -1

     

    Cassiterite is the ore of which metal?

  • Question 16
    4 / -1

    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?

    Solution

    The process by which lighter earthly particles are free from the heavier ore particles by washing with water is called levigation.

  • Question 17
    4 / -1

    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

    Solution

    In the Baeyer process Al2O3 is obtained from bauxite ore by treating the powered ore with a strong solution of NaOH when alumina (Al2O3) dissolves forming sodium mefa-aluminate leaving behind impurities.

  • Question 18
    4 / -1

    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.

    Solution

    (i) → (r), (ii) → (p), (iii) → (q), (iv) → (s)

  • Question 19
    4 / -1

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

    Solution

    (i) → (q), (ii) → (r,t), (iii) → (p), (iv)→ (s)

  • Question 20
    4 / -1

     

    In electrorefining of copper some gold is produced as:

  • Question 21
    4 / -1

     

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

     

  • Question 22
    4 / -1

     

    The purest form of iron is:

  • Question 23
    4 / -1

     

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

     

  • Question 24
    4 / -1

     

    Extraction of zinc from zinc blende is achieved by

  • Question 25
    4 / -1

     

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

    Solution

     

    Ni is first reacted with CO to form Nickel tetracarbonyl which is volatile. From this complex Nickel is extracted by thermal decomposition.

     

Self Studies
User
Question Analysis

  • Correct -

  • Wrong -

  • Skipped -

My Perfomance
  • Score

    -

    out of -
  • Rank

    -

    out of -
Re-Attempt Weekly Quiz Competition
Self Studies Get latest Exam Updates
& Study Material Alerts!
No, Thanks
Self Studies
Click on Allow to receive notifications
Allow Notification
Self Studies
Self Studies Self Studies
To enable notifications follow this 2 steps:
  • First Click on Secure Icon Self Studies
  • Second click on the toggle icon
Allow Notification
Get latest Exam Updates & FREE Study Material Alerts!
Self Studies ×
Open Now