Salt cake is chemically represented by
Na2SO4
CaSO4. ½H2O
MgSO4
BaSO4
Correct Answer :
A. Na2SO4
Related Questions
__________ is an ore of lead.
Quartz
Galena
Siderite
Chalcopyrite
Main constituents of Portland cement are calcium aluminate and
Gypsum
Silicates
Sodium silicate
Carbonates
__________ is used as a catalyst in fat splitting.
ZnO
Ni
V2O5
FeO
Flash point of most vegetable oils is about __________ °C.
50
100
200
300
Permanent hardness of water is due to the presence of calcium & magnesium
Bi-carbonates
Sulphates & chlorides
Carbonate
None of these
Dacron (or Terylene) fibres as compared to nylon fibres have
Better heat & acid resistant properties
Poorer resistance to alkalis
Poorer dyeability
All (A), (B) and (C)
__________ is produced using Polycondensation reaction.
Polythene
Phenol formaldehyde
Poly vinyl chloride
None of these
The ideal pulp for the manufacture of paper should have high __________ content.
Cellulose
Lignin
Both (A) & (B)
None of these
Impurities present in brine is normally removed by treatment with
NH3 and CO2
Lime and soda ash
Lime, ammonia and carbon
All (A), (B) and (C)
Molecular weight of plastics ranges from
5000 to 10000
20000 to 250000
500 to 5000
106 to 109
Raw materials used for producing __________ cement does not contain iron oxide.
Waterproof
Slag
White
Pozzolan
Diaphragm electrolytic cell as compared to mercury electrolytic cell
Produces 70% NaOH solution
Requires less specific power consumption for the production of chlorine
Requires lesser investment for similar capacity
All (A), (B) and (C)
Most commonly used rubber vulcanising agent is
Sulphur
Bromine
Platinum
Alumina
Liquor poisoning generally occurs due to the presence of __________ in it.
Ethyl alcohol
Impurities
Methyl alcohol
Carbonic acid
Styrene butadiene rubber (SBR) is
A natural rubber
A synthetic polymer
A synthetic monomer
Another name of silicone rubber
CaO is called
Quick lime
Slaked lime
Limestone
Calcite
Which is the main reducing agent during production of iron from iron ore in a blast furnace?
C
CO
CO2
H2
Cooking liquor in case of sulphite process is
Sodium sulphite and sodium bisulphite
Magnesium sulphite and free SO2 in acid medium
Magnesium sulphate and magnesium bicarbonate
None of these
Acrylonitrile is mainly used in the __________ industry.
Polymer
Printing
Dyeing
Photographic
Soap cannot be used with hard water, because
Hard water contains sulphate
They form insoluble calcium soaps which precipitate
They attract back the removed dirt
None of these
Portland cement consists mainly of
CaO & SiO2
SiO2 & Al2O3
CaO & Al2O3
CaO & Fe2O3
The gasification reaction represented by, C + H2O = CO + H2, is a/an __________ reaction.
Exothermic
Endothermic
Catalytic
Autocatalytic
Enamels
Give good glossy finish
Are same as varnish
Are prepared from non-drying oil
Do not contain pigment
The enzyme which converts starch into the disaccharides maltose is
Diastase
Maltase
Yeast
None of these
Deaeration of water in its treatment is necessary, as it
Minimises its turbidity
Helps in controlling its taste and odour
Minimises its corrosiveness
None of these
The catalyst used in the production of elemental sulphur from H2S (by oxidation-reduction) is
Alumina
Silica gel
Platinum
Nickel
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
Which of the following additives/water proofing agents is added to lower the hydrophilic (moisture loving) characteristic of cement?
Xanthates
Stearic acid
Calcium & aluminium stearate
Formic acid
Chalcopyrite is the main ore of
Copper
Lead
Tin
Iron
Which of the following is used as a binding material in soap to improve soap texture?
Rosin
Borax
Benzyl acetate
Sodium carbonate