JEE Chemistry General Principles and Processes Of Isolation Of Elements MCQs Set A

Question: Which one of the following is an ore of silver ?

• a) Argentite
• b) Stibnite
• c) Bauxite
• d) Haematite

Answer: Argentite

Question: Cinnabar is an ore of

• a) Hg
• b) Cu
• c) Pb
• d) Zn

Answer: Hg

Question: An example of an oxide ore is

• a) Bauxite
• b) Zinc blende
• c) Malachite
• d) Feldspar

Answer: Bauxite

Question: The natural materials from which an element can be extracted economically are called

• a) ores
• b) gangue
• c) minerals
• d) None of these

Answer: ores

Question: The most abundant metal on the surface of the earth is

• a) Al
• b) Na
• c) Fe
• d) Ca

Answer: Al

Question: Which of the following is an ore of tin ?

• a) Cassiterite
• b) Carborundum
• c) Epsomite
• d) Spodumene

Answer: Cassiterite

Question: Which of the following is chalcopyrite?

• a) CuFeS₂
• b) FeS₂
• c) KMgCl₃.6H₂O
• d) None of these

Answer: CuFeS₂

Question: Haematite is the ore of

• a) Fe
• b) Pb
• c) Cu
• d) Au

Answer: Fe

Question: Composition of azurite mineral is

• a)

  

• b)

  

• c)

  

• d) None of these

Answer:

Question: Which one of the following is a mineral of iron ?

• a) Magnetite
• b) Cassiterite
• c) Malachite
• d) Pyrolusite

Answer: Magnetite

Question: All ores are minerals, while all minerals are not ores because

• a) the metal can’t be extracted economically from all the minerals
• b) minerals are complex compounds
• c) the minerals are obtained from mines
• d) all of these are correct

Answer: the metal can’t be extracted economically from all the minerals

Question: Which one of the following is not a sulphide ore?

• a) Magnetite
• b) Copper glance
• c) Iron pyrites
• d) Sphalerite

Answer: Magnetite

Question: The impurities associated with mineral used in metallurgy are called collectively?

• a) Gangue
• b) Slag
• c) Flux
• d) Ore

Answer: Gangue

Question: The most abundant element in the earth’s crust (by weight) is

• a) O
• b) Si
• c) Al
• d) Fe

Answer: O

Question: Malachite is an ore of

• a) copper
• b) zinc
• c) iron
• d) mercury

Answer: copper

Question: Cassiterite is an ore of

• a) Sn
• b) Ni
• c) Mn
• d) Sb

Answer: Sn

Question: Galena is an ore of

• a) Pb
• b) Hg
• c) None of these
• d) Zn

Answer: Pb

Question: The metal always found in the free states is

• a) Au
• b) Cu
• c) Ag
• d) Na

Answer: Au

Question: Matrix is defined as

• a) the unwanted foreign material present in the ore
• b) the flux added to remove the unwanted impurities from ore
• c) the slag formed as a result of the reaction of flux with gangue
• d) the material used in the reduction of metal oxide to metal

Answer: the unwanted foreign material present in the ore

Question: Which of the following pair is incorrectly matched ?

• a) Calamine – ZnCO₃
• b) Magnetite – Fe₃O₄
• c) Zincite – ZnS
• d) None of these

Answer: Calamine – ZnCO₃

More Questions.......................................

Question: Which one of the following ores is best concentrated by froth-flotation method ?

• a) Magnetite
• b) Galena
• c) Cassiterite
• d) Malachite

Answer: Magnetite

Question: Froth floatation process is used for the metallurgy of

• a) sulphide ores
• b) amalgams
• c) chloride ores
• d) oxide ores

Answer: sulphide ores

Question: Cassiterite is concentrated by

• a) electromagnetic separation
• b) floatation
• c) liquefaction
• d) levigation

Answer: electromagnetic separation

Question: While extracting an element from its ore, the ore is grounded and leached with dil. potassium cyanide solution to form the soluble product potassium argento cyanide. The element is

• a) Silver
• b) Chromium
• c) Lead
• d) Manganese

Answer: Silver

Question: The method of concentrating the ore which makes use of the difference in density between ore and impurities is called

• a) levigation
• b) magnetic separation
• c) leaching
• d) liquifaction

Answer: levigation

Question: Leaching is a process of

• a) concentration
• b) oxidation
• c) reduction
• d) refining

Answer: concentration

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

• a) Argentite
• b) Copper pyrite
• c) Galena
• d) Cinnabar

Answer: Argentite

Question: Electromagnetic separation is used in the concentration of

• a) cassiterite
• b) copper pyrites
• c) bauxite
• d) cinnabar

Answer: cassiterite

Question: For which ore of the metal, froth floatation method is used for concentration?

• a) Cinnabar
• b) Horn silver
• c) Bauxite
• d) Heamatite

Answer: Cinnabar

Question: Which of the following metal is leached by cyanide process

• a) Ag
• b) Al
• c) Na
• d) None of these

Answer: Ag

Question: Which one of the following ores is not concentrated by froth floatation process?

• a) Pyrolusite
• b) Copper pyrites
• c) Pyrargyrite
• d) Zinc blende

Answer: Pyrolusite

Question: In froth flotation process many chemicals (frother , collector, activator, and depressant) are used. Which of the following is a frother ?

• a) Pine oil
• b) CuSO₄
• c) NaCN+ alkali
• d) Potassium xanthate

Answer: Pine oil

Question: Froth flotation process is based on

• a) wetting properties of ore particle
• b) specific gravity of ore particles
• c) magnetic properties of ore particles
• d) electrical properties of ore particles

Answer: wetting properties of ore particle

Question: In the froth flotation process of concentration of ores, the ore particles float because they

• a) have the surface which is not wetted easily
• b) have a constant electrical charge
• c) are insoluble
• d) are light

Answer: have the surface which is not wetted easily

Question: Main function of roasting is

• a) to remove volatile substances
• b) oxidation
• c) reduction
• d) slag formation

Answer: to remove volatile substances

Question: Roasting is generally done in case of the

• a) sulphide ores
• b) oxide ores
• c) silicate ores
• d) carbonate ores

Answer: sulphide ores

Question: Heating of pyrites in air for oxidation of sulphur is called

• a) roasting
• b) smelting
• c) calcination
• d) slagging

Answer: roasting

Question: The role of calcination in metallurgical operations is

• a) to decompose carbonates and drive off moisture and organic matter
• b) to decompose carbonates
• c) to drive off organic matter
• d) None of these

Answer: to decompose carbonates and drive off moisture and organic matter

Question: General method for the extraction of metal from oxide ore is

• a) carbon reduction
• b) reduction by aluminium
• c) reduction by hydrogen
• d) electrolytic reduction

Answer: carbon reduction

Question: Function of the flux added during smelting is

• a) to remove gangue
• b) to make ore porous
• c) to make reduction easier
• d) to precipitate slag

Answer: to remove gangue

Question: Process followed before reduction of carbonate ore is

• a) calcination
• b) liquation
• c) roasting
• d) polling

Answer: calcination

Question: Calcination is the process in which

• a) ore is heated below its melting point to expel H₂O or CO₂
• b) ore is heated below its melting point to expel volatile impurities
• c) ore is heated above its melting point to expel H₂O or CO₂ or SO₂
• d) None of these

Answer: ore is heated below its melting point to expel H₂O or CO₂

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

• a) a basic flux is needed
• b) both acidic and basic fluxes are needed
• c) Neither of them is needed
• d) an acidic flux is needed

Answer: a basic flux is needed

Question: Which of the following fluxes is used to remove acidic impurities in metallurgical process?

• a) Lime stone
• b) Sodium carbonate
• c) Silica
• d) Sodium chloride

Answer: Lime stone

Question: Which of the following reactions is an example for calcination process ?

• a)

  

• b)

  

• c)

  

• d) None of these

Answer:

Question: After partial roasting the sulphide of copper is reduced by

• a) self reduction
• b) electrolysis
• c) cyanide process
• d) reduction with carbon

Answer: self reduction

Question: Hydro-metallurgical process of extraction of metals is based on

• a) complex formation
• b) dehydration
• c) hydrolysis
• d) dehydrogenation

Answer: complex formation

Question:

• a) Roasting
• b) Purification
• c) Concentration
• d) Reduction

Answer: Roasting

Question: Which of the following is not used as a collector ?

• a) Cresols
• b) Pine oil
• c) Xanthates
• d) Fatty acids

Answer: Cresols

Question: Which of the following reaction represents calcination process ?

• a)

  

• b)

  

• c)

  

• d) None of these

Answer:

Question: According to Ellingham diagram, the oxidation reaction of carbon to carbon monoxide may be used to reduce which one of the following oxides at the lowest temperature ?

• a) Cu₂O
• b) ZnO
• c) MgO
• d) Al₂O₃

Answer: Cu₂O

Question:  Which of the following condition favours the reduction of a metal oxide to metal?

• a)

  

• b)

  

• c)

  

• d) None of these

Answer:

Question: Ellingham diagram normally consists of plots of

• a)

  

• b)

  

• c)

  

• d) None of these

Answer:

Question:

• a)

  

• b)

  

• c)

  

• d) None of these

Answer:

Question: In the blast furnace iron oxide is reduced by

• a) CO
• b) limestone
• c) silica
• d) carbon

Answer: CO

Question: Furnaces are lined with calcium oxide because

• a) it is refractory and basic
• b) it is not affected by acids
• c) it gives strong light on heating
• d) it gives off oxygen on heating

Answer: it is refractory and basic

Question: The following reactions take place in the blast furnace in the preparation of impure iron. Identify the reaction pertaining to the formation of the slag.

• a)

  

• b)

  

• c)

  

• d) None of these

Answer:

Question: Refractory materials are generally used in furnaces because

• a) they can withstand high temperature
• b) they are chemically inert
• c) they do not require replacement
• d) they possess great structural strength

Answer: they can withstand high temperature

Question: Which of the following reactions taking place in the blast furnace during extraction of iron is endothermic?

• a)

  

• b)

  

• c)

  

• d) None of these

Answer:

Question: Cast iron is

• a) All of the above statements are true
• b) extremely hard and brittle
• c) having slightly lower carbon content (about 3%) as compared to pig iron
• d) made by melting pig iron with scrap iron and coke using hot air blast

Answer: All of the above statements are true