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Extractive Metallurgy

Extractive Metallurgy

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1. Argentite is the ore of

Copper
Silver
Lead
Magnesium
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2. Flash smelting is used for the production of

Copper
Lead
Tungsten
Aluminium
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3. Tabling is based on the principle of

Modification of surface tension
Difference in density
Differential initial acceleration
Differential lateral movement
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4. Which one of the following minerals is a source of Lead ?

Pyrolusite
Malachite
Calomal
Cerrusite
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5. The process of reducing the ore with carbon in the presence of flux is known as

Sintering
Smelting
Calcination
Raosting
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6. Dow process is used in the extraction of

Zinc
Aluminium
Magnesium
Lead
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7. In froth floatation process, which one of the following acts a depressors

Thiocarbonates
NaCN
Pine oil
CuSO4
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8. Which is the most abundant ferrous metal present in the earth’s crust

Aluminium
Iron
Nickel
Cobalt
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9. Which one of the following has the lowest density

Lead
Aluminium
Zinc
Magnesium
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10. which one of the following process has the objective of Precipitation of metal in aqueous solution

Leaching
Cementation
Converting
Roasting
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11. The reagent used in the soda-lime-sinter(S-L-S) process of production of Al2O3.

NaOH
H2SO4
Na2CO3
HCl
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12. which one of the following process has the objective of Selective dissolution of metal.

Cementation
Leaching
Converting
Roasting
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