261. Bleaching powder (chemically known as calcium chloro hypochlorite) is commercially produced by the action of chlorine on
Slaked lime
Soda lime
Calcium perchlorate
None of these
✅ The correct answer is option A.
Chemical Process MCQs
262. Saponification value/number of an oil or fat is a measure of its
Fatty acid content
Degree of unsaturation of the fatty acids present in it
Average molecular weight
Insoluble fatty acid content
✅ The correct answer is option C.
263. __________ is used as a flux in the extraction of iron from iron ore (hametite) in blast furnace.
Bauxite
Limestone
Quartz
Manganese
✅ The correct answer is option B.
264. Commercial scale production of hydrogen from iron-steam reaction represented by, 3Fe + 3H₂O = Fe₃O₄ + 4H₂, is not practised, as it is
A slow reaction
A discontinuous reaction (requiring regeneration of iron by water gas intermittently)
Still in development stage (by employing fluidised bed technique)
All of the above
✅ The correct answer is option D.
265. During the manufacture of sulphuric acid, the temperature of molten sulphur is not increased beyond 160°C, as
It is very corrosive at elevated temperature
Its viscosity is not reduced on further heating (hence pressure drop on pumping it, cannot be further reduced)
It decomposes on further increasing the temperature
None of these
✅ The correct answer is option B.
266. In an integrated steel plant, NH₃ present in coke oven gas is normally recovered as
(NH₄)2SO₄
NH₄Cl
(NH₄)2 NO₃
Liquid NH₃
✅ The correct answer is option A.
267. Main use of hydrazine is
As a rocket fuel
In water treatment
As a disinfectant
As fire retardant
✅ The correct answer is option A.
268. Catalytic oxidation of naphthalene produces
Styrene
Phenol
Phthalic anhydride
None of these
✅ The correct answer is option C.
269. 99.5% purity oxygen is used in
Cutting and welding by oxy-acetylene flame
Hospitals for medicinal purposes
Gas masks and artificial breathing apparatus
All of the above
✅ The correct answer is option D.
270. __________ iron is the purest form of iron.
Cast
Wrought
Pig
High silicon
✅ The correct answer is option B.