A. Concentration B. Refining C. Smelting D. None of these
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A. Gold B. Silver C. Copper D. Sodium
A. Oxide ores B. Sulphide ores C. Silicate ores D. Carbonate ores
A. Zn and Pb B. Fe and Hg C. Fe and C D. C and Pt
A. Hoop’s process B. Bayer’s process C. Serpeak’s process D. Hall’s process
A. Pine oil B. Mustard oil C. Coconut oil D. Olive oil
A. Mammals and molluscs B. Birds and lizards C. Frog and cartilagenous fishes D. Insects and fishes