METALLURGY QUIZ-9

Q1. Leaching is a process of:

•  Reduction
•  Oxidation
•  Refining
•  Concentration

Solution
Leaching is a chemical method for the concentration of an ore.

Q2.Carbon reduction is used for the extraction of:

•  Al
•  Fe
•  K
•  None of these

Solution
Carbon reduction process is used for extraction of less electropositive metals like Pb,Fe,Zn,Sb,Cu, etc., from their ores.

Q3.  On heating a mixture of Cu_2 O and Cu_2 S, we get:

•   Cu_2 SO_3
•  CuO+CuS
•  Cu+SO_3
•  Cu+SO_2

Solution
Auto reduction occurs Cu_2 S+2Cu_2 O⟶6Cu+SO_2

Q4. Which of the following processes involves the roasting process?

•  ZnCO_3⟶ZnO+CO_2
•  Fe_2 O_3+3C⟶2Fe+3CO
•  Al_2 O_3.2H_2 O⟶Al_2 O_3+2H_2 O
•  2PbS+3O_2⟶2PbO+2SO_2

Solution
It is definition of roasting.

Q5.High purity copper metal is obtained by:

•  Electrolytic reduction
•  Thermite process
•  Hydrogen reduction
•  Carbon reduction

Solution
 It is a fact.

Q6. Which element is found in human body?

•  Pb
•  Fe
• Al
•  Cd

Solution
It is found in human body as haemoglobin.Wrought or malleable iron is the purest form of iron

Q7.Purest form of iron is

•  Pig iron
•  Steel
•  Wrought iron
•  Cast iron

Solution
Wrought or malleable iron is the purest form of iron

Q8.In the commercial electrochemical process for aluminium extraction, electrolyte used is:

•  Al(OH)_3 in NaOH solution
•  A molten mixture of Al_2 O_3 and Na_3 AlF_6
•  A molten mixture of Al_2 O_3 and Al(OH)_3
•  An aqueous solution of Al_2 (SO_4 )_3

Solution
It is a fact.

Q9.An alloy is:

•  Intermetallic compound
•  A solid which contains more than one non-metal
•  A solid which contains one non-metal
•  A solid substance containing two or more elements

Solution
It is a fact.

Q10. Which is statement is incorrect?

•  Galena is an ore of Pb
•  Ore is heated strongly, above its melting point in roasting
•  Silica acts as acidic flux
• Electrostatic separation is used for lead sulphide

Solution
Roasting is the process in which the ore is heated strongly below its melting point is presence of air