5071. Dehydrogenation of ethyl benzene produces
Styrene
Naphthalene
Phenol
Benzoic acid
✅ The correct answer is option A.
Chemical Engineering
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5072. Kaoline is a/an
Refractory material
Synthetic resin
Artificial abrasive
Blue pigment
✅ The correct answer is option A.
5073. Styrene-butadiene-rubber (SBR) as compared to natural rubber has
Poorer tensile strength
Poorer resistance to oxidation
Greater amount of heat build-up under heavy loading
All of the above
✅ The correct answer is option D.
5074. Lubricating greases are a mixture of
Mineral oil, soap and additives
Mineral oil and metallic soap
Mineral oil and fatty oil
Fatty oil and metallic soap
✅ The correct answer is option A.
5075. Glycerine is not used in the
Manufacture of explosive
Conditioning and humidification of tobacco
Manufacture of pharmaceuticals
None of these
✅ The correct answer is option D.
5076. Good quality of edible salt is obtained from brine by the process of
Solar evaporation
Vacuum evaporation
Freeze drying
Electrolysis
✅ The correct answer is option B.
5077. Concentration of NaOH solution produced by mercury electrolytic cell is about __________ percent.
10
25
50
98
✅ The correct answer is option C.
5078. __________ is an ore concentrating metallurgical process involving a chemical change.
Electromagnetic separation
Froth floatation
Roasting
None of these
✅ The correct answer is option C.
5079. Carbon tetrachloride (CCl₄) is the starting raw material for the manufacture of
Trichloroethylene
Perchloroethylene
Parathion
Methanol
✅ The correct answer is option B.
5080. Mercury electrolytic cell produces 50-70% NaOH solution. Its operating temperature is __________ °C.
25
60-70
150-200
250-300
✅ The correct answer is option B.