IBX - CPI Sec. 1 to 3 Flashcards
IndiaBIX - Chemical Process (Sections 1 to 3) (150 cards)
1
Q
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.
A
low temperature and high pressure.
2
Q
Gun powder, which is an explosive comprises of charcoal, sulphur and
glycerene
salt petre
nitro glycerene
dynamite
A
salt petre
3
Q
Starting raw material for the manufacture of alum is
alumina
gypsum
bauxite
ammonium bicarbonate
A
bauxite
4
Q
Salt cake is chemically represented by
Na2SO4
CaSO4.H2O
MgSO4
BaSO4
A
Na2SO4
5
Q
Which of the following sugars is the sweetest?
Glucose
Fructose
Sucrose
Lactose
A
Fructose
6
Q
Paper pulp produced by kraft/sulphate process is
bleached easily
dull white in color
strong fibrous
dark colored
A
strong fibrous
7
Q
Claude process of gas liquefaction employs
merely compression of gas beyond its critical pressure.
Joule-Thomson expansion cooling.
heat exchange with colder stream.
adiabatic expansion against a piston or in a turbine.
A
adiabatic expansion against a piston or in a turbine.
8
Q
The main use of HCl is in the
drilling of petroleum wells and pickling of steel sheets.
manufacture of cationic detergent.
treatment of spent fuel of nuclear reactor.
none of these.
A
drilling of petroleum wells and pickling of steel sheets.
9
Q
The gasification reaction represented by, C + H2O = CO + H2, is a/an __________ reaction.
exothermic
endothermic
catalytic
autocatalytic
A
endothermic
10
Q
Viscose rayon is chemically
cellulose nitrate
regenerated cellulose nitrate
cellulose acetate
regenerated cellulose acetate
A
regenerated cellulose acetate
11
Q
All enzymes are made of
fats
carbohydrates
proteins
amino acids
A
proteins
12
Q
The combustion reaction, C + O2 = CO2, is
exothermic
endothermic
autocatalytic
none of these
A
exothermic
13
Q
Styrene is produced from ethyl benzene by the process of
dehydrogenation
oxidation
alkylation
dehydration
A
dehydrogenation
14
Q
Gelatine which is a nitrogenous organic protein is obtained by the hydrolysis of
callagen
tannin
molasses
carbohydrate
A
callagen
15
Q
The chamber process is
preferred over contact process for producing 98 to 100% H2SO4 and various oleums.
non-catalytic and operates only on pyrites.
a batch process for directly producing high strength (98 to 100%) H2SO4.
none of these.
A
none of these.
16
Q
Sucrose content in the raw juice extracted from sugar cane is about __________ percent.
1 - 2
15 - 20
50 - 60
80 - 85
A
15 - 20
17
Q
Fusel oil is a/an
essential oil.
extract from medicinal herbs.
mixture of higher molecular weight alcohols (a by-product obtained during production of alcohol from molasses).
none of these.
A
mixture of higher molecular weight alcohols (a by-product obtained during production of alcohol from molasses).
18
Q
Styrene-butadiene-rubber (SBR) as
compared to natural rubber has
Poorer tensile strength.
poorer resistance to oxidation.
greater amount of heat build-up under heavy loading.
all (a), (b) and (c).
A
all (a), (b) and (c).
19
Q
Co-efficient of thermal expansion of glass is decreased by the addition of __________ during its manufacture.
CaO
MnO2
ZnO
FeS
A
ZnO
20
Q
The catalyst used in the manufacture of DDT (from chloral and chlorobenzene) is
dilute H2SO4
oleum
ultraviolet light
none of these
A
oleum
21
Q
Haemoglobin is a/an
amino acid
biological catalyst
protein
enezyme
A
protein
22
Q
Epoxy resin
is a good adhesive.
is an elastomer.
cannot be used for surface coatings.
is a polyester.
A
is a good adhesive.
23
Q
Concentration of NaOH solution produced by mercury electrolytic cell is about __________ percent.
10
25
50
98
A
50
24
Q
Which of the following is the most adverse factor challenging the choice of mercury electrolytic cell process for the production of caustic soda?
High cost of mercury.
High specific gravity of mercury.
Non-availability of high purity mercury.
Pollution of water stream by mercury.
A
Pollution of water stream by mercury.
25
Esterification reaction produces
detergent
vanaspati
soap
mercaptans
soap
26
Wood charcoal is used for decolouration of sugar, because it __________ the coloured materials.
adsorbs
oxidises
reduces
converts
adsorbs
27
Producer gas consists mainly of
CO, CO2 N2, H2
CO, H2
H2, CH4
C2H2, CO2, H2
CO, CO2 N2, H2
28
Neoprene is the trade name of
polyurathane
phenol formaldehyde
polychloroprene
styrene-butadiene rubber
polychloroprene
29
Hard water
does not affect the lather formation by soap.
is not unfit for drinking purpose.
pollutes the water stream.
all (a), (b) and (c).
is not unfit for drinking purpose.
30
Which of the following is an organo-metal-lic compound?
Isopropyl alcohol
Tetra-ethyl lead
Zeolite
Cumene
Tetra-ethyl lead
31
Sulphur addition in soap is done to
improve the soap texture.
cure pimples & dandruff.
fasten lather formation.
increase its cleansing action.
cure pimples & dandruff.
32
Phosphate rock is a raw material for the manufacture of
phosphoric acid
phosphorous
superphosphates
all (a), (b) and (c)
all (a), (b) and (c)
33
Mineral oils (e.g. petroleum oils) are preferred over fatty oils (e.g. mustard oil, ghee, tallow, palm oil, olive oil etc.) as a lubricant due to its
poor oxidation stability and high gum forming tendency.
greater tendency of decomposition at elevated temperature.
hydrolysis tendency in presence of water.
all (a), (b) and (c).
all (a), (b) and (c).
34
Which of the following is not a raw material used for the manufacture of ordinary glass?
Iron oxide
Soda ash
Limestone
Silica
Iron oxide
35
Esterification reaction
produces soap.
is reversible.
is a reaction between an alcohol and an organic acid.
all (a), (b) and (c).
all (a), (b) and (c).
36
In sulphate pulp manufacture, the pressure and temperature in the digestor is
10 atm., 800 °C
10 atm., 170-180°C
1 atm., 170 - 180°C
l atm., 800°C
10 atm., 170-180°C
37
Zeolite removes both temporary as well as permanent hardness of water by precipitating calcium and magnesium present in water as insoluble zeolites. Used zeolite is regenerated by flushing with the solution of
calcium sulphate
sodium chloride
sodium sulphate
magnesium chloride.
sodium chloride
38
Pick out the endothermic reaction out of the following.
C+O2 = CO
CO + 3H2 = CH4 + H2O
CaCO3 = CaO + CO2
CO +O2 = CO2
CaCO3 = CaO + CO2
39
Pasteurisation of milk means
removal of fatty and albuminous substance from it.
killing of organisms present in it by heating it at controlled temperature without changing its natural characteristics.
inhibiting the growth of micro-organisms without killing them.
none of these.
killing of organisms present in it by heating it at controlled temperature without changing its natural characteristics.
40
Fusion of bauxite and __________ produces high alumina cement.
alum
limestone
coke
quartz
limestone
41
__________ process is used for the manufacture of sodium carbonate by ammonia soda process.
Ostwald's
Bosch
Solvay
Haber's
Solvay
42
Polycaprolactum is commercially known as
nylon-6
nylon-66
dacron
rayon
nylon-6
43
Frasch process is for
making oxygen
producing helium
mining sulphur
making nitrogen
mining sulphur
44
Very fine suspended and colloidal impurities are removed from water by a process called
sedimentation
coagulation
disinfection
softening
coagulation
45
Pitch (a product of coal tar distillation) is always mixed with creosote oil, when it is to be burnt in a burner, because
its calorific value is very less.
tar neutralises the residual acids present in pitch.
it reduces viscosity and imparts fluidity for its transportation through pipelines at economic pressure drop.
all (a), (b) and (c).
it reduces viscosity and imparts fluidity for its transportation through pipelines at economic pressure drop.
46
Which is the main reducing agent during production of iron from iron ore in a blast furnace?
C
CO
CO2
H2
CO
47
The drug used in contraceptives is
sulphadizene
mestranol
methyl salicylate
pencillin
mestranol
48
Raw materials used for producing __________ cement does not contain iron oxide.
waterproof
slag
white
pozzolan
white
49
In the Lurgi coal gasifier
coking coals cannot be used.
low carbon conversion efficiency is achieved.
entrainment of solids is higher.
large quantity of coal can be processed.
large quantity of coal can be processed.
50
Neon gas is
flammable in nature.
used in color discharge tube.
filled in lamps having tungsten filament.
all (a), (b) and (c).
used in color discharge tube.
51
Calgon used in water treatment is chemically
sodium phosphate
sodium hexametaphosphate
calcium phosphate
tricresyl phosphate
sodium hexametaphosphate
52
Which oil is preferred for paint manufacture?
Drying oil
Non-drying oil
Semi-drying oil
Saturated oil
Drying oil
53
Styrene butadiene rubber (SBR) is
a natural rubber.
a synthetic polymer.
a synthetic monomer.
another name of silicone rubber.
a synthetic polymer.
54
Ethylene oxide is produced by oxidation of ethylene in presence of AgO catalyst at
1 atm & 100°C
5 atm & 275°C
100 atm & 500°C
50 atm & 1000°C
5 atm & 275°C
55
Glycerine is not used in the
manufacture of explosive.
conditioning and humidification of tobacco.
manufacture of pharmaceuticals.
none of these.
none of these.
56
Cumene is the starting material for the production of
benzoic acid
phenol and acetone
isoprene
styrene
phenol and acetone
57
The type of high refractive index glass used in optical instruments is __________ glass.
pyrex
flint
crookes
none of these
flint
58
Oxidation of ortho-xylene in presence of __________ catalyst is done to produce phthalic anhydride on commercial scale.
nickel
vanadium
alumina
iron
vanadium
59
Most commonly used rubber vulcanising agent is
sulphur
bromine
platinum
alumina
sulphur
60
Terylene is
same as dacron
a polyester
both (a) & (b)
neither (a) nor(b)
both (a) & (b)
61
Free alkali in a toilet soap is __________ that in a laundary shop.
less than
more than
same
none of these
less than
62
Dehydrogenation of isopropanol produces
propyl alcohol
acetone
trichloroethylene
formaldehyde
acetone
63
Pick out the wrong statement.
Eosin requirement in tallow soap is about 40-50% which fastens the lather formation, softens the hard soaps and increases its cleansing action.
Soap powder is prepared by mixing soap with hydrated sodium carbonate.
Detergents differ from soaps in their action in hard water.
Tarnish inhibitor (e.g., benzotriazole) is added in soap to facilitate the removal of stains due to tea, blood etc.
Tarnish inhibitor (e.g., benzotriazole) is added in soap to facilitate the removal of stains due to tea, blood etc.
64
Concentration of hydrogen peroxide is done by
crystallisation
vacuum crystallisation
atmospheric distillation
dehydration
vacuum crystallisation
65
Helium is produced on commercial scale from
air
natural gas
coke oven gas
none of these
natural gas
66
Fermentation of molasses to produce ethyl alcohol is done at __________ °C
20 - 30
< - 5
100 - 150
250 - 300
20 - 30
67
The catalyst used in the manufacture of DDT is
alumina.
silica.
20% oleum.
aluminium chloride.
20% oleum.
68
Most widely and commonly used coagulant for the removal of suspended impurities in water is
bleaching powder
slaked lime
alum
copper sulphate
alum
69
__________ is used as a catalyst in fat splitting.
ZnO
Ni
V2O5
FeO
ZnO
70
Which of the following is not produced on commercial scale from sea water?
Bromine.
Magnesium compounds.
Potassium compounds.
Sodium sulphate.
Sodium sulphate.
71
Heating of __________ to 120°C, produces plaster of paris.
blue vitriol
gypsum
calcium silicate
calcium sulphate
gypsum
72
Pick out the wrong statement.
Conversion of SO2 to SO3 in Monsanto-4 pass converter is about 98%.
The chemical formula of oleum is H2S2O7, which is formed by saturating sulphuric acid with sulphur trioxide.
Vitriol oil is nothing but technical sulphuric acid.
Decomposition of sulphuric acid on heating does not start before its boiling.
Decomposition of sulphuric acid on heating does not start before its boiling.
73
Which of the following has sodium bicarbonate as its main constituent ?
Baking soda
Baking powder
Washing soda
none of these
Baking powder
74
Ordinary glass is not a/an
amorphous isotropic material.
supercooled liquid.
material with sharp definite melting point.
electrical insulator.
material with sharp definite melting point.
75
In premitive days, __________ was being manufactured by Leblanc Process.
alum
washing soda
soda ash
calcium carbide
soda ash
76
The only commercial Fischer-Tropsch plant for producing liquid hydrocarbon fuel from coal is located at
SASOL (in South Africa).
Redcar (U.K.).
Los-Angles (U.S.A.).
Trombay (India).
SASOL (in South Africa).
77
Lurgi coal gasifier is a pressurised __________ bed reactor.
moving
fixed
fluidised
entrained
moving
78
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.
cause cholesterol build up and blood clotting.
79
Paper grade bamboo contains about __________ percent cellulose.
5
20
40
60
5
80
Carboxymethyl cellulose (CMC) is added in detergents to act as a/an
surfactant
builder
optical brightening agent
anti soil redeposition agent
anti soil redeposition agent
81
Vulcanisation of rubber
decreases its tensile strength.
increases its ozone & oxygen reactivity.
increases its oil & solvent resistance.
converts its plasticity into elasticity.
converts its plasticity into elasticity.
82
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.
salt, limestone and coke or gas.
83
Chloral is used in the manufacture of
DDT
BHC
parathion
none of these
DDT
84
Bromine is used in the preparation of
fire extinguishing compounds.
fire proofing agents.
dyes and antiknock compounds.
all (a), (b) and (c).
all (a), (b) and (c).
85
Sudden temperature fluctuation does not affect pyrex glass, because of its
low co-efficient of expansion.
high co-efficient of expansion.
high melting point.
both (b) and (c).
low co-efficient of expansion.
86
The process used for the manufacture of ethyl alcohol from molasses is
distillation
dehydration
dehydrogenation
none of these
none of these
87
Most easily and cheaply available fibrous raw material for paper manufacture available in India is bamboo. The yield of pulp produced from fibrous raw material by mechanical process is about __________ percent.
75
< 10
> 30
50
< 10
88
Absorption of SO3 in 97% H2SO4 is
exothermic
endothermic
not possible
none of these
exothermic
89
__________ process is used for the commercial production of nitric acid by the catalytic oxidation of ammonia.
Solvay
Ostwald's
Haber's
none of these
Ostwald's
90
Sulphuric acid solution having a specific gravity of 1.20 at room temperature is used mainly for the
fertiliser manufacture
car battery solution
synthesis of oleum
water treatment
car battery solution
91
The catalyst used in the production of elemental sulphur from H2S (by oxidation-reduction) is
alumina
silica gel
platinum
nickel
alumina
92
A good quality coal should have
low fusion point of ash
high ash content
high sulphur content
none of these
none of these
93
Zeolite used in water softening process (cation exchange) is regenerated by washing with
brine
chloramines
sodium bisulphite
liquid chlorines
brine
94
The catalyst used in shift converter is
nickel
vanadium
silica gel
alumina
nickel
95
Which of the following is a detergent ?
Benzene hexachloride
Alkyl benzene sulphonate
Polytetraflouroethylene
Cellulose nitrate
Alkyl benzene sulphonate
96
Drinking (potable) water treatment does not involve
coagulation
sedimentation
softening
disinfection
softening
97
Phenol formaldehyde resin is used as an adhesive in making
laminates
card boxes
furniture
books
laminates
98
Pick out the correct statement.
A fat is converted into oil by its hydrogenation.
There is no difference between a fat and an oil so far as its physical properties are concerned.
All vegetable oils except coconut oil, contains fatty acids having more than sixteen carbon atoms.
Vegetable oils are classified as drying, non-drying and semi drying oils depending upon their fatty acids content.
All vegetable oils except coconut oil, contains fatty acids having more than sixteen carbon atoms.
99
DDT should not be allowed to come in contact with iron (during its manufacture) to
avoid its decomposition.
prevent sulphonation of the monochlorobenzene by the acid catalyst.
achieve non-hygroscopic property.
none of these.
avoid its decomposition.
100
Catalyst used in the manufacture of sulphuric acid by chamber & contact processes are respectively
V2O5 & Cr2O3.
oxides of nitrogen & Cr2O3.
V2O5 on a porous carrier & oxides of nitrogen.
oxides of nitrogen & V2O5 on a porous carrier.
oxides of nitrogen & V2O5 on a porous carrier.
101
DDT stands for
diethyl-diphenyl-trichloromethane.
dichloro-diphenyl-trichloromethane.
diphenyl-dichloro-trichloromethane.
dichloro-diphenyl-trichloroethane.
dichloro-diphenyl-trichloroethane.
102
Phosphoric acid is prepared from
cryolite
chalcopyrite
rock phosphate
none of these
rock phosphate
103
Metallic soap (e.g. aluminium or calcium salts of fatty acids) can be used
as a lubricant.
as a rust preventive.
in hard water for cleaning of cloth.
as a foam depressant in distillation column.
as a lubricant.
104
Which of the following processes does not produce Cl2 as a co-product during the manufacture of caustic soda ?
Diaphragm electrolytic cell process
Mercury electrolytic cell process
Lime-soda process
None of these
Lime-soda process
105
Bleaching action of bleaching powder is due to its __________ properties.
reducing
oxidising
disinfecting
none of these
oxidising
106
Solvent extracted oil
has low free fatty acid content.
is odourless.
has more of unsaturates.
none of these.
none of these.
107
Which of the following is not required in the manufacture of soda ash by Solvay process ?
Ammonia
Limestone
Nitric acid
None of these
Nitric acid
108
Saponification number of an oil or fat
gives an idea about its molecular weight.
is inversely proportional to its molecular weight.
detects its adulteration.
all (a), (b) & (c).
all (a), (b) & (c).
109
The purpose of tanning in leather industry is to
stiffen the leather.
smoothen the leather.
make it flexible.
impart water resistance.
stiffen the leather.
110
Lime and soda ash are added to water to remove
bicarbonates & sulphates of calcium and magnesium.
undersirable taste and odour.
bacteria.
its corrosiveness.
bicarbonates & sulphates of calcium and magnesium.
111
Kaoline is a/an
refractory material
synthetic resin
artificial abrasive
blue pigment
refractory material
112
Hydrogenation of edible vegetable oils
is an exothermic reaction.
increases their melting point.
is done in presence of nickel catalyst.
all (a), (b) and (c).
all (a), (b) and (c).
113
Phenol is mainly used
to produce benzene.
to produce phenol formaldehyde.
to produce polyester resin.
as a plasticiser for unsaturated polyster.
to produce phenol formaldehyde.
114
Main constituent of dolomite is
CaCO3
MgCO3
K2CO3
Na2CO3
MgCO3
115
Conversion of CO to CO2 by steam in presence of a catalyst is called
steam reforming.
shift conversion.
steam gasification.
none of these.
shift conversion.
116
Refractory bricks having high thermal conductivity is desirable, when it is to be used in the
L.D. converter
blast furnace
rotary kiln
recuperator
recuperator
117
Bromides contained in hot mother liquor is treated with __________ during manufacture of bromine from sea water.
SO3
Cl2
NH3
SO2
Cl2
118
Plasticisers are added to paints to
make it corrosion resistant.
make glossy surface.
give elasticity & prevent cracking of the film.
increase atmospheric oxidation.
give elasticity & prevent cracking of the film.
119
Resistance to fusion of the refractory under a steady rising temperature condition is called
spalling
refractoriness
both (a) & (b)
neither (a) nor (b)
refractoriness
120
Portland cement consists mainly of
CaO & SiO2
SiO2 & Al2O3
CaO & Al2O3
CaO & Fe2O3
CaO & SiO2
121
__________ glass has the lowest co-efficient of thermal expansion and hence is more heat resistant.
Pyrex
Soda lime
Lead
High silica
Pyrex
122
The amount of benzene present in pure benzol is about __________ percent.
30
50
70
90
70
123
Cumene (isopropyl benzene) is made by
oxidation of napthalene.
propylene alkylation of benzene.
polymerisation of a mixture of benzene & propylene.
none of these.
propylene alkylation of benzene.
124
Which of the following is not a pyrite ore?
Celestite
Galena
Gypsum
Siderite
Siderite
125
Mannheim furnace is used in the manufacture of
hydrochloric acid.
H2SO4 by Chamber process.
calcium carbide.
corundum.
hydrochloric acid.
126
Thermosetting materials
are cross-linked molecules.
soften on application of heat.
are solvent soluble.
none of these.
are cross-linked molecules.
127
Pick out the wrong statement. Iodine value of an oil or fat is
the number of grams of iodine taken up by 100 gm of oil or fat.
a measure of its unsaturation.
helpful in findings its adulteration & its suitability for making soap.
independent of the type of oil, whether it is drying or non-drying.
independent of the type of oil, whether it is drying or non-drying.
128
Nickel is not used as a catalyst in the
Fischer-Tropsch process.
shift conversion.
hydrogenation of oil.
Ostwald's process of HNO3 manufacture.
Ostwald's process of HNO3 manufacture.
129
__________ iron is the purest form of iron.
Cast
Wrought
Pig
High silicon
Wrought
130
Enamels
give good glossy finish.
are same as varnish.
are prepared from non-drying oil.
do not contain pigment.
give good glossy finish.
131
Black liquor is converted into white liquor by
evaporation and burning the concentrate followed by causticisation of products.
multi-effect evaporation only.
selective liquid extraction.
extractive distillation.
evaporation and burning the concentrate followed by causticisation of products.
132
Varnish does not contain
thinner
pigment
both (a) & (b)
neither (a) nor (b)
pigment
133
Alcohol is produced by the
oxidation of an aldehyde
hydrolysis of an ether
esterification of a fat
none of these
hydrolysis of an ether
134
Varnish does not contain
pigment
thinner
dryer
anti-skimming agent
pigment
135
Polymerisation product of C2F4 (carbon tetraflouride) is called P.T.F.E (poly chloro tetra flouro ethylene). It is also called
polyurethane
silicone
teflon
epoxy resin
teflon
136
Solvent used for extraction of oil is
hexane
methyl ethyl ketone
furfurol
none of these
hexane
137
Insulin is an __________ drug.
anti-malarial
anti-TB
antibiotic
none of these
none of these
138
Liquor poisoning generally occurs due to the presence of __________ in it.
ethyl alcohol
impurities
methyl alcohol
carbonic acid
methyl alcohol
139
Neoprene is chemically known as
polybutadiene
styrene butadiene rubber (SBR)
polyurathane
polychloroprene
polychloroprene
140
Pick out the wrong statement.
Chamber process of sulphuric acid manufacture produces pure acid of concentration < 80%.
Contact process of sulphuric acid manufacture produces pure acid of concentration ≥ 98%.
75% oleum can be produced by distillation of 20% oleum.
Contact process of sulphuric acid manufacture uses nickel as the catalyst.
Contact process of sulphuric acid manufacture uses nickel as the catalyst.
141
Pick out the wrong statement.
Catalytic hydrogenation of carbon monoxide produces methyl alcohol.
In nylon-6, the number 6 represents the total number of carbon atoms in the ring.
Raw materials for DDT manufacture are benzene and chlorine.
Ethanolamines are produced by using ammonia and ethylene oxide as raw material.
Raw materials for DDT manufacture are benzene and chlorine.
142
Molecular weights of polymers are in the range of
10^2 - 10^2
10^5 - 10^9
10^2 - 10^7
10^9 - 10^11
10^2 - 10^7
143
Sulphur removal by heating of pyrite ore in presence of air is called its
reduction
roasting
calcination
smelting
roasting
144
Deacon's method is used for the manufacture of
glauber's salt
common salt
chlorine
graphite electrode
chlorine
145
Pick out the true statement pertaining to water treatment.
Slow sand filters can remove colour completely.
Activated carbon can be used for taste & odour control without subsequent filtration.
Application of activated carbon reduces the temporary hardness of water.
Normally, the turbidity is removed by adding a coagulent prior to sedimentation.
Normally, the turbidity is removed by adding a coagulent prior to sedimentation.
146
Laboratory glass wares which reacts with hydroflouric acid, are made of the __________ glass.
lead
borosilicate
soda lime
alkali silicate
borosilicate
147
Prussian blue is chemically represented by
FeO.TiO2
Ca SO4 . 2H2O
Fe4 [Fe (CN6)3]
AlF3 . 3NaF
Fe4 [Fe (CN6)3]
148
Transportation of 35% oleum during winter suffers from the problem of freezing, which can be overcome by the addition of small quantity of
nitric acid
hydrochloric acid
methyl alcohol
formic acid
nitric acid
149
The most stable allotropic form of phosphorous is the __________ phosphorous.
white
black
yellow
red
black
150
Function of thinner in a paint is to
accelerate the oxidation of oil.
prevent gelling of the paint.
suspend pigments & dissolve film forming materials.
form a protective film.
suspend pigments & dissolve film forming materials.
