31. The drug ‘Marijuana’ is a
32. The Refrigerant 'FREON' is
33. The chemical(s) most commonly used for cloud seeding or ‘artificial rainmaking’ is/are
34. 'Fire-fighting clothes' are made from
35. Trinitrotoluene is
36. The chief source for the production of nitrogeneous fertilizers is :
37. Which one of the following elements is used in the manufacture of safety matches?
38. Zinc sulphide is commonly used as
39. Which halide is used in making sensitive emulsion on photograhic film?
40. Detergents clean surfaces on the principle of
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