chem process (sec 10-14) Flashcards
A unit operation is exemplified by the process of
desorption
The major constituents of glass are
sand, lime and soda ash
Margarine is a/an
fat
Oils and fats are converted to soap in a process called
saponification
Glycerine can be obtained from
fat
Blue vitriol is chemically
copper sulphate
Trinitro-toluene (TNT) is
an explosive.
Thorium is mainly used
for the manufacture of gas mantles.
During the absorption of HCl gas in water (to produce liquid HCl), the gas is kept above dew point to
avoid corrosion.
Good quality of edible salt is obtained from brine by the process of
vacuum evaporation
Electric bulbs are made of __________ glass.
flint
Which of the following is used as a binding material in soap to improve soap texture ?
Borax
An alkali metal salt of palmitic acid is known as
metallic soap
Washing soda is chemically represented by
Na2CO3.10H2O
Magnesium and calcium __________ cause temporary hardness of water.
bicarbonates
Which form of sulphur is the most stable at room temperature ?
Rhombic
Vegetable oils and fats basically differ in their
physical state
Average sulphur content in Indian pyrites is about __________ percent.
35
Oil is a/an
mixture of glycerides of fatty acids.
Which of the following is a constituent of coffee ?
Caffeine
Which of the following is the main constituent of the mother liquor produced in salt industry ?
Bromine
Silicon carbide is a/an
adhesive
Oxygen is produced by fractionation of air using __________ process.
either (a) or (b)
Linde’s
Claude’s
Trinitrotoluene (TNT), an explosive, is made by the nitration of
toluene
Which of the following is used as a coagulant in treating turbid water ?
Ferric sulphate
Carborundum consists mainly of
silicon carbide
Wax is a
mixture of esters of polyhydric alcohols excepting glycerine.
Catalyst used in the hydrogenation of oil is
nickel
Viscose rayon is
none of these.
cellulose nitrate.
regenerated cellulose nitrate.
regenerated cellulose acetate.
Triple superphosphate is manufactured by reacting
phosphate rock with phosphoric acid.
Use of hydrated lime in water treatment
all (a), (b) and (c).
before filtration, reduces the bacterial load on filters.
after filtration, combats the corrosive-ness of water due to the presence of O2 & CO2.
is to adjust the pH value.
Higher vicosity index of a lubricating oil denotes
less changes in fluidity of oil with temperature.
Le-Blanc process is a primitive process for the manufacture of
soda ash
How much temperature is maintained during quicklime manufacture in the calcination zone of the vertical shaft kiln?
1000°C
Cement setting under water employs a/an __________ process.
hydration
are added in lacquers to remove film brittleness and to improve adhereness.
Plasticisers
Washing of coal is done to
both(b) and (c).
remove the adhering impurities.
reduce the ash content.
Systemic insecticides
are absorbed throughout the plant.
Dry ice (solidified CO2) is used for the
storage & shipment of frozen foods and ice-creams.
In nylon-66, the first and second numbers (i.e., 6) respectively designate the number of carbon atoms present in the
diamine and the dibasic acid.
Chemical formula of BHC, which is an insecticide is
C6H6Cl6
A bio-catalyst produced by living cells which acts independent of the cell is called a/an
enzyme
Pick out the wrong statement.
DDT is manufactured by the condensation of chlorobenzene with chloral at 30°C in presence of oleum, which is a highly exothermic reaction.
Chloral is obtained by the chlorination of ethyl alcohol.
Insecticides acting on the insects through the respiratory system are called fumigants.
Benzene hexachloride is not a contact insecticide.
Benzene hexachloride is not a contact insecticide.
The product obtained on mixing calcium oxide with water is called
slaked lime
The major constituent of black liquor generated during paper manufacture is sodium
carbonate
Plaster of Paris is
CaSO4 1/2H2O
used for setting of broken bones
Exothermic neutralisation reaction between caustic soda and dodecylbenzene sulphonic acid produces sodium dodecylbenzene sulphate, which is a/an
detergent
Conversion of SO2 to SO3 in Monsanto 4-pass converter is about __________ percent.
98
Coke oven gas consists mainly of
H2, & CH4
Chemical name of ‘alum’ is
aluminium sulphate.
Lithopaneis
ZnS (white pigment)
What products do we get on electrolysis of saturated brine using steel cathode and graphite anode in an electrolytic cell ?
Cl2, H2 & NaOH solution.
Chemical formula of ‘salt cake’ is
Na2SO4
Temperature during hydrogenation of oil should not be more than 200°C, otherwise it will result in
all (a), (b) and (c).
pyrolysis of oil.
sintering of porous catalyst.
hydrogen embrittlement.
Nicotine is
both (a) and (b).
a volatile alkaloid.
obtained by treating by-products of the tobacco processing industry.
Separation of fresh water from sea water can be done by the __________ operation.
reverse osmosis
Na2CO3.10H2O is called
washing soda
Reaction of an alcohol with organic acid is called the __________ reaction.
esterification
Ethanol amine is produced using ammonia and
ethylene oxide
__________ acid is an unsaturated fatty acid.
Oleic
CO & H2 are the constituents of
all (a), (b) and (c)
producer gas
water gas
coke oven gas
Economics of ‘Solvay Process’ depends upon the efficiency of
ammonia recovery and size of the plant
__________ is a thermosetting plastic.
Bakelite
Na2CO3 is called
soda ash
Flux addition during smelting of ore is done to
remove impurities/gangue.
Hydrazine is used in water treatment for the removal of
dissolved oxygen
Direct conversion of chemical energy into electrical energy is done in a
fuel cell.
Which of the following is not produced commercially from sea water ?
Iodine
Pick out the wrong statement.
(a) Dry process is used for the manufacture of cement, when the raw material is blast furnace slag.
(b)Portland cement is made employing wet process.
(c) Gypsum is added to portland cement to lengthen its setting time.
(d) none of these.
none of these.
Nylon-6 as compared to Nylon-66 is having higher
none of these
hardness
abrasion/resistance
melting point
Digestion of wood-base materials (for manufacture of pulp) is done to
remove lignin.
Soap cannot be used with hard water, because
they form insoluble calcium soaps which precipitate.
Which of the following is not an antibiotic ?
Quinine
The most reactive allotropic form of phosphorus is __________ phosphorus.
yellow
Plasticisers are added to synthetic plastics to
all (a), (b) and (c).
impart flexibility.
improve workability during fabrication.
develop new improved properties not present in the original resins.
Rosin soap is added during paper manufacture to
impart resistance to penetration by liquids.
Hydrogen gas is not produced commercially (for nitrogeneous fertiliser manufacture) by
iron-steam reaction.
Carboxymethyl cellulose (CMC) is added in detergents to
prevent redeposition of soil on cleaned surface.
Synthesis gas is a mixture of
CO and H2
Which of the following impurities in feed water for high pressure boiler is the most detrimental ?
Silica
Which glass is usually used in optical work?
Lead glass
Fourdrinier machine is used in the manufacture of
paper
The most popular and common detergent i.e., alkyl benzene sulfonate (ABS) is a/an __________ detergent.
anionic
Reaction of calcium carbide with water produces a gas, which is used
both (a) & (b).
as an illuminant.
for metal cutting/welding.
Salt is the basic raw material for the manufacture of
caustic soda
Pick out the wrong statement.
Low intensity explosives are also called propellants, whereas high intensity explosive are called detonators.
Gun powder comprises of 75% salt petre, 15% charcoal and 10% sulphur.
Lead azide is a popular military explosive.
TNT is a hygroscopic explosive having very high melting point and is non-toxic to human being.
TNT is a hygroscopic explosive having very high melting point and is non-toxic to human being.
Hydrocynic acid (HCN) is used as an insecticide for
citrus fruits
Hydrazine (N2H4) is used mainly as a/an
rocket fuel
Molecular weight of plastics ranges from
20000 to 250000
Acrylonitrile is mainly used in the __________ industry.
dyeing
The enzyme which converts starch into the disacharides maltose is
diastase
Pick out the false statement pertaining to water treatment.
Aeration of water is effective in CO2 removal.
The zeolite water softening process reduces the hardness of water by not more than 50%.
Sodium sulphate or sodium carbonate do not cause hardness in water.
Water with pH value less than 7, is acidic.
The zeolite water softening process reduces the hardness of water by not more than 50%.
Presence of H2S in raw water (to be chlorinated) results in the
increased dosage of chlorine to provide a disinfecting residual in the water.
Contact process of sulphuric acid manufacture
yields acid of higher concentration than chamber process.
Fat dispersed in water is exemplified by
butter
Maleic anhydride is produced by catalytic oxidation of
benzene
Catalyst used in the oxidation of benzene to produce maleic anhydride is
V2O5
Widely used method for the conditioning of boiler feed water is the
hot-lime soda process
Blue colour is imparted to glass by the addition of
CaO
In the manufacture of viscose rayon, the raw material used industrially is
fine teak wood
Bordeaux mixture is a/an
inorganic fungicide
Silicone is a/an
inorganic polymer
ickel is not used as a catalyst in the __________ reaction.
shift conversion
Molasses is the starting material for the production of
alcohol
BHC (Benzene hexachloride) is made by the chlorination of benzene
which is an addition reaction.
Diaphragm electrolytic cell as compared to mercury electrolytic cell
requires lesser investment for similar capacity.
Calcareous & argillaceous materials are used in the manufacture of
cement
Pick out the wrong statement.
none of these.
Azoic dyes are mostly applied on cotton fabrics.
Basic dyes (e.g. amino derivatives) are applied mostly to paper.
Mordant dyes are applied mainly to wools.
Commercial production of calcium carbide requires limestone and __________ as raw materials.
coke
Which one of the following is not likely to be a constituent of vegetable oils ?
Citric acid
Nitroglycerene absorbed in wood flour, sodium nitrate or ammonium nitrate is commercially used as a controlled explosive called dynamite. The raw material used for its manufacture are glycerene, nitric acid and
sulphuric acid
The process involved in converting rubber into a thin sheet or coating it on fabric is called
calendering
Detergent is produced by the sulphonation of dodecyl benzene, which is an __________ reaction.
both (b) and (c)
exothermic
irreversible
Air used in aerobic fermentation must be sterilized, otherwise the
contamination of pure culture would result.
High temperature carbonisation of coal produces
none of these.
inferior coke compared to low temperature carbonisation.
less of gases compared to liquid products.
larger quantity of tar compared to low temperature carbonisation.
Alcohol content in freshly prepared natural and fortified wine may be respectively around __________ percent.
7-14 and 14-30
Setting of plaster of paris is accompanied with
hydration
Process conditions in fermentator used for production of penicillin is
25°C, 2 atm.
Platinum is a versatile catalyst for many processes in chemical industries. It is highly prone to be poisoned by the presence of
arsenic
Bleaching of paper pulp is done with
chlorine or chlorine dioxide
Sodium chloride content in sea water is about __________ gms/litre.
25
Fluorescent dyes are added in detergents to
act as fabric brightener (by converting ultraviolet light to visible light) thereby improving the whiteness appearance of white fabrics.
High magnesia lime is added to hot sugar cane juice (during the manufacture of sugar) to
both (a) and (b).
flocculate the impurities.
facilitate fast filtration.
Polyvinyl chloride (PVC) is
made by employing emulsion polymerisation.
Pick out the wrong statement.
Kraft method of pulp manufacture can process all types of fibrous raw materials.
Digestion time for bagasse is less than that for wood base materials.
Both temperature and pressure in the digestor is less in case of the sulphite method as compared to that in the sulphate method.
none of these.
none of these.
Consider the production of ammonia from methene and air as raw materials. The catalyst used are: (i) __________ for steam reforming of methane and (ii) __________ for ammonia synthesis.
i - Ni/Al2O3; ii - Fe/Al2O3
Isopropyl benzene produced by alkylation of benzene with propylene is known as
cumene
Main constituents of natural rubber is
polyisoprene
For the hydrogenation of oils __________ (A) __________ is commonly used as catalyst and __________ (B) __________ is a catalyst poison.
(A) nickel (B) sulphur
Highly porous refractory bricks are
none of these.
less susceptible to chemical attack by molten fluxes and gases etc.
very strong.
having very high thermal conductivity.
Fumigant insecticides
emit poisonous vapour.
Which of the following is an endothermic reaction ?
Absorption of SO3 in 98% H2SO4.
C + H2O = CO + H2.
Thermal dissociation of iron pyrites.
Both (b) and (c).
Both (b) and (c).
Fermentator temperature during production of alcohol from molasses is around __________ °C.
30
Cooking liquor in case of sulphite process is
sodium sulphite and sodium bisulphite.
Which of the following is not an abrasive material ?
Bakelite
90% of the caprolactum is converted to nylon-6 on its condensation polymerisation in the reactor maintained at __________ °C.
10-30
Pick out the wrong statement.
Hard glass which is used for making laboratory glass wares is a mixture of sodium borosilicate and aluminium borosilicate.
Glass is decolorised during its manufac-ture by adding antimony oxide, mangnese dioxide or arsenic oxide.
Ordinary glass is represented chemically by Na2O . CaO . 6SiO2.
Red color is imparted to glass by addition of arsenic oxide.
Red color is imparted to glass by addition of arsenic oxide.
Finely ground calcium aluminate & silicate is a/an
cement
Vegetable oils contain large quantity of glycerides of unsaturated acids. When the vegetable oils contain high amount of saturated fatty acids, it is termed as __________ oil.
non-drying
Fats as compared to oils have
less unsaturated glycerides of fatty acids.
Thermal pyrolysis of ethylene dichloride produces
vinyl chloride
The main component of pyrex glass is
lead
Alum [Al2(SO4)3] is used as a coagulant in water treatment to remove
all (a), (b) and (c)
colour
turbidity
bacteria
__________ is an ore concentrating metallurgical process involving a chemical change.
Roasting
Basic oxide is absent in __________ glass.
quartz
Graphite is a/an
both (b) and (c).
allotrope of carbon.
moderator used in nuclear reactor.
Nylon-6 is a
polyamide
Enzymes are
all (a), (b) and (c).
proteins with high molecular weight (around 10, 000).
derived from living organisms.
catalyst for temperature sensitive reactions.
Multistage catalytic converter is not used in the
NH3 synthesis reaction.
The main product of high temperature carbonisation of coal is
coke
__________ is a thermosetting plastic.
Epoxy polymer
In an integrated steel plant, NH3 present in coke oven gas is normally recovered as
(NH4)2SO4
Flexible foam (for mattresses) is usually made of
polyurethanes
Glycerine is a by-product of the __________ industry.
soap
One of the steps during refining of cane sugar consists of addition of hydrated lime to the sugar syrup followed by carbonation of the resulting solution. The purpose of this step is to
adjust the pH of the syrup.
Permanent hardness of water can be removed by
all (a), (b), and (c).
addition of soda ash to it.
treating it with zeolites.
passing it through sodium hexametaphosphate.
Chalcopyrite is the main ore of
copper
The end bleaching agent used to move last traces of colour bodies from the pulp is
chlorine dioxide (ClO2)
Bio-degradable detergents
can be readily oxidised.
Sea water contains about __________ ppm of bromine.
70
Which allotrope of sulphur is insoluble in carbon disulphide ?
Plastic sulphur
Lubricating greases are a mixture of
mineral oil, soap and additives.
Metallic soap is __________ salt of fatty acids.
aluminium or calcium
Cation exchanger is regenerated usually with
H2SO4
In contact process, SO3 is absorbed in 97% H2SO4 and not in water, because
water forms an acid mist, which is difficult to absorb.
Bitterns is a/an
none of these.
unsaturated fat.
starting material for the production of iodine.
by-product of chlor-alkali industry.
The most widely used coagulant for removing suspended impurities from water is
alum
Main constituent of limestone is
CaCO3
is obtained as a by-product in the manufacture of sodium hydroxide using brine.
Chlorine
Fat splitting catalyst is
ZnO
Phthalic anhydride is used
as plasticisers
Penicillin is separated from fermented broth by
extraction with amyl or butyl acetate.
_________ process is used for producing soda ash.
Solvay
Bleaching powder (chemically known as calcium chloro hypochlorite) is commercially produced by the action of chlorine on
slaked lime
Which of the following is an unsaturated fatty acid ?
Oleic acid
The yield of tar from high temperature carbonisation of dry coal is about __________ percent.
3
__________ is used as a flux in the smelting of copper ore like chalcopyrite.
Silica/quartz
Phenol formaldehyde is produced by condensation polymerisation. It is also known as
bakelite
Hydrogenation of oil does not
none of these.
Main constituents of cotton fiber is
cellulose
CaCl(OCl) is the chemical formula of
bleaching powder
Which is the most suitable dye for synthetic fibres ?
Acid dye
Pick out the wrong statement.
Cold rubber (SBR) is superior as compared to hot rubber (SBR).
Polymerisation temperature can modify the properties of SBR.
Production of cold SBR employs lower pressure as compared to that of hot SBR.
none of these.
none of these.
Pick out the wrong statement.
Strongly caking coal should not be used in the Lurgi gasifier.
Acetylene gas can not be used for illumination purpose.
Water gas is called blue gas because of the color of the flame, when it is burnt.
Gaseous fuels require less percentage of excess air for combustion as compared to liquid fuels.
Acetylene gas can not be used for illumination purpose.
Hydrolysis of sugar is called
inversion
Sulphuric acid completely saturated with sulphur trioxide is called
concentrated sulphuric acid.
Fish contains about __________ percent oil.
20
The main aim behind cooling the digested chip at the bottom portion of the digestor by injecting cold black liquor is to
avoid mechanical weakening of fibre.
Polymethyl methacrylate (PMMA) is known as
perspex
Coloured glass is obtained by mixing of colored salts. Addition of __________ oxide is done to impart greenish blue color to the glass.
copper
Percentage of alcohol in beer may be around __________ percent.
2-8
Which of the following is an ore of iron ?
Hematite
Which of the following may be viewed as a catalyst in the manufacture of soda ash by Solvay process ?
NH3
High purity nitrogen is used in
both (a) & (b).
making protective gas (95% N2 + 5% H2) for annealing of cold rolled steel strip coils.
fire fighting purposes.
Commercial production of soda ash by Solvay process requires limestone, __________ as raw materials.
brine and coal
Naphthalene is removed from coke oven gas by
scrubbing with wash oil.
Which of the following is not present in bagasse fibre ?
None of these
Cellulose
Lignin
Pentogens
Nitric acid is not used in the manufacture of
detergents
Naphthols are derivates of
naphthalene
Fermentation is adversely affected by the
high concentration.
Extraction of __________ employs an electrolytic process.
aluminium
Dechlorination of treated water is necessary to
remove chlorinous taste.
Fire clay is __________ refractory material.
an acidic
An oil is converted into fat by its
hydrogenation
Production of one ton of cement requires about __________ tons of limestone.
1.2
Low temperature carbonisation of coal takes place at __________ °C.
700
Shaving soaps are
soft potassium soaps (potassium salt of fatty acid) with free stearic acid to give lather a lasting property.
