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: A

Question. Cinnabar is an ore of
(a) Hg
(b) Cu
(c) Pb
(d) Zn

Answer: A

Question. An example of an oxide ore is
(a) Bauxite
(b) Zinc blende
(c) Malachite
(d) Feldspar

Answer: A

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: A

Question. The most abundant metal on the surface of the earth is
(a) Al
(b) Na
(c) Fe
(d) Ca

Answer: A

Question. Which of the following is an ore of tin ?
(a) Cassiterite
(b) Carborundum
(c) Epsomite
(d) Spodumene

Answer: A

Question. Which of the following is chalcopyrite?
(a) CuFeS₂
(b) FeS₂
(c) KMgCl₃.6H₂O
(d) None of these

Answer: A

Question. Haematite is the ore of
(a) Fe
(b) Pb
(c) Cu
(d) Au

Answer: A

Question. Which one of the following is a mineral of iron ?
(a) Magnetite
(b) Cassiterite
(c) Malachite
(d) Pyrolusite

Answer: A

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: A

Question. Which one of the following is not a sulphide ore?
(a) Magnetite
(b) Copper glance
(c) Iron pyrites
(d) Sphalerite

Answer: A

Question. The impurities associated with mineral used in metallurgy are called collectively?
(a) Gangue
(b) Slag
(c) Flux
(d) Ore

Answer: A

Question. The most abundant element in the earth’s crust (by weight) is
(a) O
(b) Si
(c) Al
(d) Fe

Answer: A

Question. Malachite is an ore of
(a) copper
(b) zinc
(c) iron
(d) mercury

Answer: A

Question. Cassiterite is an ore of
(a) Sn
(b) Ni
(c) Mn
(d) Sb

Answer: A

Question. Galena is an ore of
(a) Pb
(b) Hg
(c) None of these
(d) Zn

Answer: A

Question. The metal always found in the free states is
(a) Au
(b) Cu
(c) Ag
(d) Na

Answer: A

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: A

Question. Which of the following pair is incorrectly matched ?
(a) Calamine – ZnCO₃
(b) Magnetite – Fe₃O₄
(c) Zincite – ZnS
(d) None of these

Answer: A

Question. Which one of the following ores is best concentrated by froth-flotation method ?
(a) Magnetite
(b) Galena
(c) Cassiterite
(d) Malachite

Answer: A

Question. Froth floatation process is used for the metallurgy of
(a) sulphide ores
(b) amalgams
(c) chloride ores
(d) oxide ores

Answer: A

Question. Cassiterite is concentrated by
(a) electromagnetic separation
(b) floatation
(c) liquefaction
(d) levigation

Answer: A

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: A

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: A

Question. Leaching is a process of
(a) concentration
(b) oxidation
(c) reduction
(d) refining

Answer: A

Question. Which one of the following ores is concentrated by chemical leaching method?
(a) Argentite
(b) Copper pyrite
(c) Galena
(d) Cinnabar

Answer: A

Question. Electromagnetic separation is used in the concentration of
(a) cassiterite
(b) copper pyrites
(c) bauxite
(d) cinnabar

Answer: A

Question. For which ore of the metal, froth floatation method is used for concentration?
(a) Cinnabar
(b) Horn silver
(c) Bauxite
(d) Heamatite

Answer: A

Question. Which of the following metal is leached by cyanide process
(a) Ag
(b) Al
(c) Na
(d) None of these

Answer: A

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: A

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: A

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: A

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: A

Question. Main function of roasting is
(a) to remove volatile substances
(b) oxidation
(c) reduction
(d) slag formation

Answer: A

Question. Roasting is generally done in case of the
(a) sulphide ores
(b) oxide ores
(c) silicate ores
(d) carbonate ores

Answer: A

Question. Heating of pyrites in air for oxidation of sulphur is called
(a) roasting
(b) smelting
(c) calcination
(d) slagging

Answer: A

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: A

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: A

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: A

Question. Process followed before reduction of carbonate ore is
(a) calcination
(b) liquation
(c) roasting
(d) polling

Answer: A

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: A

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

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: A

Question. After partial roasting the sulphide of copper is reduced by
(a) self reduction
(b) electrolysis
(c) cyanide process
(d) reduction with carbon

Answer: A

Question. Hydro-metallurgical process of extraction of metals is based on
(a) complex formation
(b) dehydration
(c) hydrolysis
(d) dehydrogenation

Answer: A

Question. Which of the following is not used as a collector ?
(a) Cresols
(b) Pine oil
(c) Xanthates
(d) Fatty acids

Answer: A

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: A

Question. In the blast furnace iron oxide is reduced by
(a) CO
(b) limestone
(c) silica
(d) carbon

Answer: A

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: A

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: A

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: A