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a
Alkali metals are generally extracted by electrolysis of their ores in fused state.
b
Levigation is generally employed for concentration of sulphide ores.
c
Every mineral is an ore, but every ore is not a mineral.
d
Slag is a product formed during smelting by combination of flux and impurities.
answer is 铅.
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Detailed Solution
Correct for option (2) is Froth flotation process is employed for concentration of sulphide ores.Levigation is the process of decreasing the particle size.