Which of the following is not responsible for causing permanent hardness of water?
Ca(HCO3)2
CaCl2
MgCl2
None of these
Correct Answer :
A. Ca(HCO3)2
Related Questions
Styrene is produced from ethyl benzene by the process of
Dehydrogenation
Oxidation
Alkylation
Dehydration
BHC (Benzene hexachloride) is made by the chlorination of benzene
Which is an addition reaction
Which is a substitution reaction
In absolute dark
In presence of sunlight
Plasticisers are added to paints to
Make it corrosion resistant
Make glossy surface
Give elasticity & prevent cracking of the film
Increase atmospheric oxidation
The difference between saponification value and acid value is
Called ester value
Always negative
Constant for all fatty oils
None of these
Permanent hardness of water can be removed by
Addition of soda ash to it
Treating it with zeolites
Passing it through sodium hexametaphosphate
All (A), (B), and (C)
Commercial production of soda ash by Solvay process requires limestone, __________ as raw materials.
Coke and sand
Brine and coal
Coke and caustic soda
None of these
Neon gas is
Flammable in nature
Used in color discharge tube
Filled in lamps having tungsten filament
All (A), (B) and (C)
Vinyl chloride (CH2 = CH.Cl) is produced by the thermal pyrolysis of ethylene dichloride at a pressure & temperature of
4 kgf/cm2 & 500°C
10 kgf/cm2 & 1000°C
40 kg/cm2 & 200°C
100 kgf/cm2 & 500°C
Conversion of SO2 to SO3 in Monsanto 4-pass converter is about __________ percent.
80
90
98
100
The noble gas which occurs most abundantly in the atmosphere is
Helium
Neon
Krypton
Argon
Solvent extracted oil
Has low free fatty acid content
Is odourless
Has more of unsaturates
None of these
Lithophane is
Explosive
White lead
Filter aid
ZnS (white pigment)
Which is the most suitable dye for synthetic fibres?
Acid dye
Azoic dye
Pigment dye
Mordant dye
Bio-degradable detergents
Can be readily oxidised
Pose problem in sewerage plant
Have an isoparaffinic structure
Should not be used as it spoils the cloth
Main constituents of cotton fiber is
Lignin
Cellulose
Starch
Gelatine
Ore concentration by froth floatation utilises the __________ of ore particles.
Density difference
Wetting characteristics
Terminal velocities
None of these
Anion exchanger is regenerated usually with
NaOH
H2SO4
Hydrazine
Alum solution
Lubricating greases are a mixture of
Mineral oil, soap and additives
Mineral oil and metallic soap
Mineral oil and fatty oil
Fatty oil and metallic soap
Chemical name of 'alum' is
Barium sulphate
Aluminium sulphate
Aluminium chloride
Calcium sulphate
Frasch process is for
Making oxygen
Producing helium
Mining sulphur
Making nitrogen
Massecuite is
Used for paper making
Used as a cattle feed
Highly acidic in nature
None of these
The biochemical treatment applied to sewage effluents is a process of
Dehydration
Reduction
Oxidation
Polymerisation
Major component of flint glass is
Lead oxide
Silica
Alumina
Soda
Linde process of gas liquefaction employs
Exchange of heat with colder stream
Adiabatic expansion through a throttle valve (Joule-Thomson expansion)
Adiabatic expansion against a piston or in a turbine
Merely compressing the gas beyond its critical pressure
Good quality of edible salt is obtained from brine by the process of
Solar evaporation
Vacuum evaporation
Freeze drying
Electrolysis
Which of the following, when pyrolysed, produces Perchloroethylene?
Ethylene dichloride
Chlorobenzene
Carbon tetrachloride
Chlorinated paraffin
Widely used method for the conditioning of boiler feed water is the
Cold lime process
Coagulation
Hot-lime soda process
Sequestration
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
The catalyst used in the manufacture of DDT (from chloral and chlorobenzene) is
Dilute H2SO4
Oleum
Ultraviolet light
None of these
Antibiotic
Inhibits/destroys the growth of microorganisms
Is used as a pain reliever
Is an antimalarial
Is an anaesthetic