Permanent hardness of water is due to the presence of calcium & magnesium
Bi-carbonates
Sulphates & chlorides
Carbonate
None of these
Correct Answer :
B. Sulphates & chlorides
Related Questions
Rancidity of the fatty oil can be reduced by its
Decoloration
Hydrogenation
Oxidation
Purification
Which glass is usually used in optical work?
Lead glass
High silica (borosilicate) glass
Photo-sensitive glass
Fibre glass
Cement mainly contains
CaO, SiO2, Al2O3
MgO, SiO2, K2O
Al2O3, MgO, Fe2O3
CaO, MgO, K2O
Zeolite used in water softening process (cation exchange) is regenerated by washing with
Brine
Chloramines
Sodium bisulphite
Liquid chlorines
Nylon-6 is a
Polyamide
Thermosetting resin
Polyester
None of these
Use of hydrated lime in water treatment
Before filtration, reduces the bacterial load on filters
After filtration, combats the corrosiveness of water due to the presence of O2 & CO2
Is to adjust the pH value
All (A), (B) and (C)
Ordinary glass is not a/an
Amorphous isotropic material
Supercooled liquid
Material with sharp definite melting point
Electrical insulator
The catalyst used in shift converter is
Nickel
Vanadium
Silica gel
Alumina
Portland cement consists mainly of
CaO & SiO2
SiO2 & Al2O3
CaO & Al2O3
CaO & Fe2O3
Absorption of SO3 in 97% H2SO4 is
Exothermic
Endothermic
Not possible
None of these
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
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
Graphite is a/an
Electrical insulator
Allotrope of carbon
Moderator used in nuclear reactor
Both (B) and (C)
Which of the following is not a pyrite ore?
Celestite
Galena
Gypsum
Siderite
Haemoglobin is a/an
Amino acid
Biological catalyst
Protein
Enzyme
Which of the following is an yellow pigment?
Titanium dioxide
Ferrous sulphate
Lead chromates
Zinc sulphides
Percentage of glycerine present in the spent lye obtained during soap manufacture is about
0.5
5
20
35
Glycerine is not used in the
Manufacture of explosive
Conditioning and humidification of tobacco
Manufacture of pharmaceuticals
None of these
Polymerisation product of C2F4 (carbon tetrafluoride) is called P.T.F.E (poly chloro tetra fluoro ethylene). It is also called
Polyurethane
Silicone
Teflon
Epoxy resin
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 basic difference between vegetable oils and fats is in their
Density
Chemical properties
Physical state
Composition
Multistage catalytic converter is not used in the
Conversion of SO2 to SO3
NH3 synthesis reaction
Both (A) and (B)
Neither (A) nor (B)
Thermosetting materials
Are cross-linked molecules
Soften on application of heat
Are solvent soluble
None of these
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
Attain distinctiveness from other brands
Act as tarnish inhibitor for metals like German silver
None of these
Calcination of gypsum produces
Plaster of Paris
Salt cake
Nitre cake
Lime
Oxygen is separated by distillation from air after its liquefaction. The boiling point of oxygen is about __________ °C.
-83
-183
-196
-218
Fermentation of molasses to produce ethyl alcohol is done at __________ °C.
20 - 30
< - 5
100 - 150
250 - 300
Neon gas is
Flammable in nature
Used in color discharge tube
Filled in lamps having tungsten filament
All (A), (B) and (C)
Hydrophilic group of a soap or detergent solution is
Water hating
Soil loving
Water loving
None of these
Soaps remove dirt by
Increasing the surface tension
Decreasing wettability
Supplying hydrophilic group
None of these