1. Presence of carbonaceous matter in the sewage
2. Sea water contains about __________ ppm of bromine.
3. Tall oil obtained as a by-product from the black liquor recovery is
4. Transportation of 35% oleum during winter suffers from the problem of freezing, which can be overcome by the addition of small quantity of
5. Antibiotic . . . . . . . .
6. Pick out the correct statement.
7. Rosin soap is added during paper manufacture to
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