301. Portland cement consists mainly of
CaO & SiO₂
SiO₂ & Al2O₃
CaO & Al2O₃
CaO & FE₂O₃
✅ The correct answer is option A.
Chemical Process MCQs
302. Calcination of limestone is not done in a __________ kiln for producing lime.
Vertical shaft
Rotary
Fluidised bed
Fixed bed
✅ The correct answer is option D.
303. Raw material used in alcohol distilleries in India is
Molasses
Benzol
Methylated spirit
None of these
✅ The correct answer is option A.
304. Producer gas consists mainly of
CO, CO₂ N₂, H₂
CO, H₂
H₂, CH₄
C₂H₂, CO₂, H₂
✅ The correct answer is option A.
305. Thermal pyrolysis of ethylene dichloride produces
Trichloroethylene
Vinyl chloride
Ethanol amine
Ethylene oxide
✅ The correct answer is option B.
306. Purity of oxygen used for blowing in steel making L.D. converter is 99.5%. The boiling point of oxygen is about __________ °C.
-53
-103
-183
-196
✅ The correct answer is option C.
307. Oxidation of SO₂ to SO₃ is favoured by
Low temperature and low pressure
Low temperature and high pressure
High temperature and low pressure
High temperature and high pressure
✅ The correct answer is option B.
308. Solvay process is not used for the manufacture of potassium carbonate, because of the reason that potassium bicarbonate
Is prone to thermal decomposition
Has high water solubility and is unstable
Is soluble in ammonium chloride and potassium chloride solution
All of the above
✅ The correct answer is option C.
309. Sand and __________ is fused at 1300°C, to produce sodium silicate.
Limestone
Soda ash
Coke
Sodium sulphate
✅ The correct answer is option B.
310. Thorium is mainly used
For the manufacture of gas mantles
As a fissile fuel in a nuclear reactor
In the manufacture of hydrogen bomb
In the treatment of cancer
✅ The correct answer is option A.