General principles and processes of isolation of metals MCQs-3

1) Which one of the furnaces among the following can produce the highest temperature?
a) Muffle furnace
b) Blast furnace
c) Reverberatory furnace
d) Electric furnace

2) In the metallurgy of iron, when limestone is added to the blast furnace, the calcium ion ends up in
a) Slag
b) Gangue
c) Metallic calcium
d) Calcium carbonate

3) Which of the following change of property is not possible when an alloy is formed?
a) Corrosion rate decreases
b) Hardness increases
c) Conductivity decreases
d) None of the above

4) Spelter is
a) Impure zinc
b) Impure iron
c) Pure zinc
d) Impure Al

5) The metal which can be extracted from dolomite, magnesite and carnallite is
a) Na
b) K
c) Ca
d) Mg

6) Calcination and roasting are
a) Different names of the same operation
b) Used for the purification of metals
c) Usually carried out in a reverberatory furnace
d) Employed for the concentration of the ore

7) Monel metal is an alloy of
a) Cu-Ni
b) Mg-Al
c) Cu-Sn
d) Zn-Sn

8) The salt which is least likely to be found in minerals is
a) Sulphate
b) Nitrate
c) Chloride
d) Sulphide

9) The oil used in the floatation method for the purification of ores is
a) Coconut oil
b) Olive oil
c) Pine oil
d) None

10) In a reverberatory furnace,
a) The flames come in contact with the charge
b) The flames do not come in contact with the charge
c) The flames are not produced
d) Only hot gases come in contact with the charge

11) ln electro refining, the impure metal is made the
a) Cathode
b) Anode
c) Both
d) None

12) Amongst the following, the one which is not an ore of an alkali metal is
b) Epsom salt
c) Common salt
d) Feldspar

13) The mineral called Chile saltpetre is

14) Sodium burns in air to give

15) A crystal of sodium chloride consists of
d) Dimers of NaCl

16) cannot be used in place of for the identification of ions because
c) Sodium will react with the acid radical
d) Magnesium will be precipitated

17) on heating gives
d) None of the above

18) Sodium metal is prepared commercially by the electrolysis of fused NaCl by the
b) Nelson cell
c) Solvay process

19) In the Down’s process for the extraction of sodium, the melting point of the electrolyte is lowered by adding
a) KF
c) KCl

20) The formula of sodium nitroprusside is

21) The products of the reaction,Na2CO3+CO2+H20 is /are
d) None of these

22) When the same amount of zinc is treated separately with excess of dil.H2SO4 and excess of NaOH, the ratio of the volumes of H2 evolved is:
a) 1:1
b) 1:2
c) 2:1
d) 9:4

23) In the Caster-Kellner cell used for the manufacture of NaOH, the cathode in the central compartment is made up of
a) Carbon
b) Iron
c) Mercury
d) Nickel

24) Compound X and Y are obtained by the reaction of Cl2 with cold and dilute solution of NaOH and compounds X and Z are formed with hot and concentrated solution of NaOH. Y and Z are:
a) NaCl,NaClO
d) NaClO,HCl

25) A compound of sodium which when heated gives CO2 is

26) In the manufacture of NaOH by electrolysis of an aqueous solution of sodium chloride, the cathode and anode are separated by using a diaphragm or slate partitions because
c) It prevents the mixing of NaOH and NaCl

27) Solid NaCl is a bad conductor of electricity since
a) Solid NaCl is Covalent
b) In solid NaCl there are no ions
c) In solid NaCl there are no electrons

28) Molten NaCl conducts electricity due to the presence of free
a) Ions
b) Electrons
c) Molecules
d) Na and Cl atoms

29) When the standard solution of NaOH is left in air for a few hours
a) A precipitate will be formed
b) The strength of the solution will increase
c) The strength of the solution will decrease
d) The concentration of sodium ions will decrease

30) Which valuable byproduct is obtained in the process for the extraction of sodium?
a) Oxygen
b) Chlorine
c) Hydrogen
d) None of the above

31) In the process for the manufacture of sodium by electrolysis of molten NaCl the cathode and the anode are separated by a diaphragm because
c) It prevents the mixing of NaOH and NaCl

32) Sodium carbonate is prepared industrially by
b) Solvay process
c) Contact process

33) The raw material required for the manufacture of Na2CO3 by Solvay process are

34) Which is an ore of potassium ?
a) Carnallite
b) Cryolite
c) Bauxite
d) Dolomite

35) Which of the following carbonates decomposes on heating ?
d) All

36) Leaching of Ag2S is carried out by heating it with a dilute solution of
a) NaCN alone
c) HCI
d) NaOH

37) If an isotope of hydrogen has two neutrons in its atom, its atomic number and atomic mass number will respectively be
a) 2 and 1
b) 3 and 1
c) 1 and 1
d) 1 and 3

38) Which of the following is not a mineral of phosphorus ?
a) Phosphorite
b) Chlorapatite
c) Fluorapatite
d) Carnallite

39) In the modern process phosphorus is manufactured by
a) Heating a mixture of phosphorite mineral with sand and coke in electric furnace
b) Heating calcium phosphate with coke
c) Heating bone ash with coke
d) Heating the phosphate mineral with sand

40) Tin is extracted from tin stone by heating it in a furnace with
a) CaCO3
b) CaO
c) Steam
d) Coal

41) The van Arkel method of purification of metals involves converting the metal to a
a) Votatile stable compound
b) Volatile unstable compound
c) Non-volatile stable compound
d) None of these

42) Saltpetre is
a) KNO2

b) KNO3

c) Na NO2

d) Pb ( NO3 ) 2

43) In the Goldschmidt reaction, certain metallic oxides are reduced to the metallic state by heating with
a) Metallic magnesium
b) Metallic aluminium
c) Metallic iron
d) Sodium metal

44) Near the top of the blast surface used for the extraction of iron, the metal oxides are reduced to spongy iron by
a) C
b) CO
c) CO2

d) Ca Si O3

45) Copper metal is refined by
a) Liquation
b) Cupellation
c) Bessemerisation
d) Poling

46) In the Goldschmidt aluminothermic process, thermite contains
a) 3 parts Fe2O3 and 2 parts Al

b) 3 parts Al2 O3 and 4 parts Al

c) 1 part Fe2O3 and 1 part Al

d) 3 parts Fe2O3 and 1 part Al

47) High purity copper metal is obtained by
a) Carbon reduction
b) Hydrogen reduction
c) Electrolytic reduction
d) Thermite process

48) Cryolite is used in the electrolytic extraction of aluminium
a) To obtain more aluminium
b) To dissolve bauxite
c) To protect anodes
d) As a reducing agent

49) Brommetite mainly contains
a) Be CO3

b) BeO
c) Be SO4

d) All of these


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