Main constituent of dolomite is
CaCO3
MgCO3
K2CO3
Na2CO3
Correct Answer :
B. MgCO3
Related Questions
Anion exchanger is regenerated usually with
NaOH
H2SO4
Hydrazine
Alum solution
White phosphorous is stored under water, because
It does not react with water
It is poisonous
Its kindling temperature in dry air is very low
It is unstable
Glycerine is recovered from lye by
Evaporation followed by vacuum distillation
Liquid extraction technique
Extractive distillation technique
None of these
The major constituent of black liquor generated during paper manufacture is sodium
Sulphate
Carbonate
Hydroxide
Bi-carbonate
Na2CO3.10H2O is called
Washing soda
Soda ash
Slaked lime
Quicklime
Temperature during hydrogenation of oil should not be more than 200°C, otherwise it will result in
Pyrolysis of oil
Sintering of porous catalyst
Hydrogen embrittlement
All (A), (B) and (C)
Styrene (a monomer for the production of polystyrene) is commercially produced by
Catalytic dehydrogenation of ethyl benzene
Dehydration of ethyl alcohol followed by hydrogenation
Reacting ethylene oxide with acetaldehyde
Fermentation of starch
Penicillin, an antibiotic drug was discovered by
Alexander
Flaming
Doctor Zhivago
None of these
CaO is called
Quick lime
Slaked lime
Limestone
Calcite
Addition of calcium oxide to water produces
Exothermic heat
Hissing sound
Slaked lime
All (A), (B) & (C)
Superior quality laboratory apparatus is made of the __________ glass having low thermal coefficient of expansion & high chemical resistance.
Flint
Soda
Pyrex
Potash
Alcohol percentage in molasses may be around
10
40
70
85
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
Glauber's salt is chemically
Calcium sulphate
Potassium sulphate
Potassium chlorate
None of these
Which allotrope of sulphur is insoluble in carbon disulphide?
Rhombic sulphur
Monoclinic sulphur
Plastic sulphur
Milk of sulphur
Zeolite is used in the
Water treatment
Glass manufacture
Hydrogenation of fatty oil as a catalyst
Development of exposed photographic plate
Carbon content of pitch (residue of coal tar distillation) is around __________ percent.
70
55
80
94
L.D. converter is used in the production of
Pig iron
Steel
Copper
Zinc
Fusion of bauxite and __________ produces high alumina cement.
Alum
Limestone
Coke
Quartz
Wet chlorine gas produced during electrolysis of brine is dehydrated by
Spraying 66° Be H2SO4 counter current to the flow of the gas
Passing it through a bed of diatomaceous earth
Passing it through a bed of silica gel
None of these
Basic oxide is absent in __________ glass.
Flint
Pyrex
Quartz
All (A), (B) & (C)
Fats as compared to oils have
More unsaturated glycerides of fatty acids
Less unsaturated glycerides of fatty acids
Much higher reactivity to oxygen
Lower melting point
Penicillin is made employing __________ fermentation process.
Continuous
Aerobic batch
Anaerobic batch
None of these
Fire clay is __________ refractory material.
A basic
An acidic
A neutral
Not a
Which of the following is the purest form of water out of the following?
Underground water
Rain water
Well water
Lake water
Zeolite used in water softening process (cation exchange) is regenerated by washing with
Brine
Chloramines
Sodium bisulphite
Liquid chlorines
In Kraft process of paper manufacture, white cooking liquor consists of caustic soda
Sodium sulphide & sodium carbonate
Sodium sulphite & sodium carbonate
Sodium sulphite & sodium sulphide
None of these
Teflon is
Phenol formaldehyde
An inorganic polymer
Poly tetra-fluoro-ethylene (P.T.F.E.)
A monomer
The major constituents of glass are
Lime, clay and soda ash
Sand, lime and soda ash
Silica, alumina and clay
Silica, alumina and soda ash
Glycerine is not used in the
Manufacture of explosive
Conditioning and humidification of tobacco
Manufacture of pharmaceuticals
None of these