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JEE Main levelSingle correct optionDifficulty 2 of 3mt013

Match the concentration method in Column I with the ore it is typically used for in Column II. Column I: (P) hydraulic washing, (Q) froth flotation, (R) leaching, (S) magnetic separation. Column II: (1) bauxite, (2) zinc blende, (3) haematite mixed with sand and clay, (4) cassiterite containing wolframite.

  1. AP-4, Q-2, R-1, S-3
  2. BP-2, Q-3, R-1, S-4
  3. CP-3, Q-1, R-2, S-4
  4. DP-3, Q-2, R-1, S-4

Answer: D

Gravity (hydraulic) washing removes light sand and clay from heavy oxide ores like haematite. Sulphides such as zinc blende are floated, bauxite is leached with alkali, and wolframite is a magnetic impurity removed from cassiterite by magnetic separation.
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