51. __________ is an ore concentrating metallurgical process involving a chemical change.
52. Hydrodenation of vegetable oils is a/an __________ reaction.
53. Most easily and cheaply available fibrous raw material for paper manufacture available in India is bamboo. The yield of pulp produced from fibrous raw material by mechanical process is about __________ percent.
54. Average sulphur content in Indian pyrites is about __________ percent.
55. Exothermic condensation reaction of monochlorobenzene with chloral in presence of 20% oleum as catalyst produces DDT. The reaction temperature is maintained at __________ °C.
56. Pick out the wrong statement.
57. Phthalic anhydride is produced by the oxidation of
58. __________ process is used for producing soda ash.
59. Fat dispersed in water is exemplified by
60. Shaving soaps are
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