391. __________ of quicklime produces slaked lime.
Hydration
Dehydration
Hydrogenation
None of these
✅ The correct answer is option A.
Chemical Process MCQs
392. The function of gypsum addition during cement making is to
Increase the density of cement
Decrease the cement setting rate
Both A and B
Neither A nor B
✅ The correct answer is option B.
393. Oils are partially hydrogenated (not fully) to manufacture vanaspati, because fully saturated solidified oils
Cause cholesterol build up and blood clotting
Are prone to rancid oxidation
Always contain some amount of nickel (as their complete removal is very difficult)
Have affinity to retain harmful sulphur compounds
✅ The correct answer is option A.
394. Raw materials for ‘Solvay Process’ for manufacture of the soda ash are
Salt, limestone and coke or gas
Ammonia, salt and limestone
Ammonia limestone and coke
None of these
✅ The correct answer is option A.
395. Hydrolysis of sugar is called
Hydration
Inversion
Esterification
None of these
✅ The correct answer is option B.
396. Pure rectified spirit contains about __________ percent alcohol.
45
70
95
99.5
✅ The correct answer is option C.
397. Catalyst used during the manufacture of ‘Vanaspati Ghee’ is
Zinc
Nickel
Platinum
Copper
✅ The correct answer is option B.
398. __________ is produced by the dehydrogenation of ethyl benzene.
Styrene
Ethyl alcohol
Cumene
Phenol
✅ The correct answer is option A.
399. Chemical name of soda ash is
Sodium bicarbonate
Sodium thiosulphate
Potassium carbonate
None of these
✅ The correct answer is option D.
400. Widely used method for the conditioning of boiler feed water is the
Cold lime process
Coagulation
Hot-lime soda process
Sequestration
✅ The correct answer is option C.