21. The catalyst used in the manufacture of DDT (from chloral and chlorobenzene) is
22. Which of the following is not produced commercially from sea water?
23. Dacron (or terylene) fibres as compared to nylon's fibres have
24. In the manufacture of H2SO4, vanadium catalyst as compared to platinum catalyst
25. Which of the following contains least amount of N2?
26. __________ is used as a flux in the smelting of copper ore like chalcopyrite.
27. A unit operation is exemplified by the process of
28. Zeolite removes both temporary as well as permanent hardness of water by precipitating calcium and magnesium present in water as insoluble zeolites. Used zeolite is regenerated by flushing with the solution of
29. Which of the following is an ore of iron?
30. Dichloro diphenyl __________ is the full form of DDT (an insecticide).
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