Na2CO3 is called
Washing soda
Soda ash
Plaster of Paris
Calcite
Correct Answer :
B. Soda ash
Related Questions
Triple superphosphate is manufactured by reacting
Phosphate rock with phosphoric acid
Phosphate rock with sulphuric acid
Phosphate rock with nitric acid
Ammonium phosphate with phosphoric acid
The function of gypsum addition during cement making is to
Increase the density of cement
Decrease the cement setting rate
Both (A) and (B)
Neither (A) nor (B)
In contact process, SO3 is absorbed in 97% H2SO4 and not in water, because
SO3 gas is sparingly soluble in water
Water forms an acid mist, which is difficult to absorb
The purity of acid is affected
Scale formation in the absorber is to be avoided
Starting raw material for the manufacture of alum is
Alumina
Gypsum
Bauxite
Ammonium bicarbonate
Higher viscosity index of a lubricating oil denotes
Less changes in fluidity of oil with temperature
Substantially high change in fluidity of oil with temperature
Its unsuitability under varying temperature conditions
None of these
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)
Type of glass used in optical work is the __________ glass.
Soda-lime
Fibre
Lead
Borosilicate
Solvay process is not used for the manufacture of potassium carbonate, because of the reason that potassium bicarbonate
Is prone to thermal decomposition
Has high water solubility and is unstable
Is soluble in ammonium chloride and potassium chloride solution
All (A), (B) and (C)
High temperature carbonisation of coal takes place at __________ °C.
2000
700
1100
< 500
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
In the manufacture of H2SO4, vanadium catalyst as compared to platinum catalyst
Gives higher conversion efficiency
Has a longer life and is not poisoned by arsenic
Handles lower SO2 content gas (7 -10% SO2), thus increasing the capital cost of the plant
All (A), (B) and (C)
Main constituent of dolomite is
CaCO3
MgCO3
K2CO3
Na2CO3
During the manufacture of sulphuric acid, the temperature of molten sulphur is not increased beyond 160°C, as
It is very corrosive at elevated temperature
Its viscosity is not reduced on further heating (hence pressure drop on pumping it, cannot be further reduced)
It decomposes on further increasing the temperature
None of these
Detergent is produced by the sulphonation of dodecyl benzene, which is an __________ reaction.
Endothermic
Exothermic
Irreversible
Both (B) and (C)
__________ is not a constituent of gun powder.
Carbon
Charcoal
Sulphur
Potassium nitrate
Naphthols are derivates of
Methyl amine
Naphthalene
Phenol
Xylene
Wet chlorine gas produced during electrolysis of brine is dehydrated by
Spraying 66° Be H2SO4 counter current to the flow of the gas
Passing it through a bed of diatomaceous earth
Passing it through a bed of silica gel
None of these
10% oleum comprises of 10% free
SO2
H2SO3
SO3
H2SO4
Viscose rayon
Cannot be made from sulphite pulp
Utilises H2SO4, NaOH and CS2 during its manufacture
Cannot yield textile grade fibre
None of these
Heating of __________ to 120°C, produces plaster of paris.
Blue vitriol
Gypsum
Calcium silicate
Calcium sulphate
Which of the following is a constituent of coffee?
Caffeine
Nicotine
Calgon
Lignin
Chlorine gas is produced by the electrolysis of brine (NaCl solution with solid NaCl make up) in mercury electrolytic cell. Which of the following is the anodic reaction?
Oxidation of Na+ ions
Oxidation of Cl- ions
Reduction of Na+ ions
Reduction of Cl- ions
Carbon disulphide is mainly used in the production of
Viscose rayon
Corundum
Plasticiser for unsaturated polyester
Paints
Lindane is
Not a fumigant
BHC (Benzene Hexachloride) containing 99% γ-isomer
A by-product of BHC manufacture
Both (B) and (C)
Out of the following processes of paper pulp manufacture, the maximum corrosion problem in digestion & handling equipments is encountered in the __________ process.
Mechanical
Sulphate/Kraft
Sulphite
Neutral sulphite semi-chemical
__________ is produced using Polycondensation reaction.
Polythene
Phenol formaldehyde
Poly vinyl chloride
None of these
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
How much temperature is maintained during quicklime manufacture in the calcination zone of the vertical shaft kiln?
500°C
750°C
1000°C
1500°C
Silicone is a/an
Thermoplastic
Inorganic polymer
Monomer
None of these
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)