Question

1.Roastingofsulphideoregivesthegas(A).(A)isacolourlessgas.Aqueoussolutionof(A)is

acidic.Thegas(A)is

a)CO2 b)SO3 c)SO2 d)H2S

2.Themetaloxidewhichcannotbereducedtometalbycarbonis

a)PbO b)Al2O3 c)ZnO d)FeO

3.WhichofthemetalisextractedbyHall-Heroultprocess?

a)Al b)Ni c)Cu d)Zn

4.Wolframiteoreisseparatedfromtinstonebytheprocessof

a)Smelting b)Calcination

c)Roasting d)Electromagneticseparation

5.Whichoneofthefollowingisnotfeasible

a)Zn(s)+Cu2+(aq)¬¬ Cu(s)+Zn2+(aq)

b)Cu(s)+Zn2+(aq)¬¬ Zn(s)+Cu2+(aq)

c)Cu(s)+2Ag+(aq)¬¬ Ag(s)+Cu2+(aq)

d)Fe(s)+Cu2+(aq)¬¬ Cu(s)+Fe2+(aq)

6.Electrochemicalprocessisusedtoextract

a)Iron b)Lead c)Sodium d)silver

7.Fluxisasubstancewhichisusedtoconvert

a)Mineralintosilicateb)Infusibleimpuritiestosolubleimpurities

c)Solubleimpuritiestoinfusibleimpuritiesd)Allofthese

8.ZincisobtainedfromZnOby

a)Carbonreductionb)Reductionusingsilver

c)Electrochemicalprocessd)Acidleaching

9.Extractionofgoldandsilverinvolvesleachingwithcyanideion.silverislaterrecoveredby

a)Distillationb)Zonerefining

c)Displacementwithzincd)liquation

10.Whichofthefollowingisusedforconcentratingoreinmetallurgy?

a)Leachingb)Roastingc)Frothfloatationd)Both(a)and(c).​

Answer 1

Explanation:

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