5051. Fermentation of molasses to produce ethyl alcohol is done at __________ °C
20 – 30
< - 5
100 – 150
250 – 300
✅ The correct answer is option A.
Chemical Engineering
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5052. Hydrazine is used in water treatment for the removal of
Colloidal impurities
Dissolved oxygen
Turbidity
Chlorinous taste
✅ The correct answer is option B.
5053. Direct conversion of chemical energy into electrical energy is done in a
Magnetohydrodynamic (MHD) generator
Fuel cell
Fast breeder reactor
None of these
✅ The correct answer is option B.
5054. Boiling of water containing temporary hardness produces
CO₂
CaSO₄
CaHCO₃
None of these
✅ The correct answer is option A.
5055. Sodium chloride content in sea water is about __________ gms/litre.
2
10
25
50
✅ The correct answer is option C.
5056. Mercury electrolytic cells are preferred over diaphragm electrolytic cell (for production of caustic soda), as it
Has larger production capacity per unit cell
Consumes less power per ton of Cl₂ produced
Produces high purity (70%) caustic soda directly
All of the above
✅ The correct answer is option D.
5057. __________ is not a constituent of gun powder.
Carbon
Charcoal
Sulphur
Potassium nitrate
✅ The correct answer is option A.
5058. RDX (an explosive), which is more sensitive but less toxic than TNT, is chemically
Cyclo trimethylene trinitramine
Trinitro resorcinol
Cyclo tetramethylene tetranitramine
Trinitro benzene
✅ The correct answer is option A.
5059. Use of hydrated lime in water treatment
Before filtration, reduces the bacterial load on filters
After filtration, combats the corrosive-ness of water due to the presence of O₂ & CO₂
Is to adjust the pH value
All of the above
✅ The correct answer is option D.
5060. Which of the following is the second major component of cement?
Al₂O₃
SiO₂
CaO
Fe₂O₃
✅ The correct answer is option B.