1
Q
Most abundant (Top 3) elements in earth crust
A
O>Si>Al
2
Q
Nitrate ores are
A)water soluble
B)water insoluble
A
NITRATE ORES ARE WATER SOLUBLE AND NOT FOUND IN EARTH CRUST
3
Q
Order of reactivity series
A
Li>K>Ba>Sr>Ca>Na>Mg>Al>Mn>Zn>Cr>Fe>Cd>Co>Ni>Sn>Pb> >Cu>Hg>Ag>Au>Pt
4
Q
Native ores
A
They contain metal in free state and are found along with impurities like rock , clay , sand etc.
5
Q
1)Pyrometallurgy , 2)Hydrometallurgy , 3)Electrometallurgy are associated with
A
1)Heat/Thermal for moderately reactive elements
2)Acqeous chemistry for least reactive elements
3)Use of electrodes for highly reactive elements
Metallurgy
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