Freeze drying
Electrolytic
Solar evaporation
Vacuum evaporation
✅ The correct answer is option A.
Chemical Process MCQs
562. Carbon content of pitch (residue of coal tar distillation) is around __________ percent.
70
55
80
94
✅ The correct answer is option D.
563. Main constituents of cotton fiber is
Lignin
Cellulose
Starch
Gelatine
✅ The correct answer is option B.
564. Ethanol amine is produced using ammonia and
Ethyl benzene
Ethylene oxide
Ethanol
Ethane
✅ The correct answer is option B.
565. Permanent hardness of water can be removed by
Addition of soda ash to it
Treating it with zeolites
Passing it through sodium hexametaphosphate
All of the above
✅ The correct answer is option D.
566. The main component of pyrex glass is
Zinc
Lead
Boron
Celenium
✅ The correct answer is option B.
567. Electric bulbs are made of __________ glass.
Jena
Flint
Crookes
Pyrex
✅ The correct answer is option B.
568. Silicone is a/an
Thermoplastic
Inorganic polymer
Monomer
None of these
✅ The correct answer is option B.
569. Function of sodium thiosulphate (hypo) in development of photographic film/plate is to
Brighten the faint images
Remove metallic silver
Convert silver chloride to silver
Remove unexposed silver halide
✅ The correct answer is option D.
570. Main constituents of portland cement are calcium aluminate and
Gypsum
Silicates
Sodium silicate
Carbonates
✅ The correct answer is option B.