Function of sodium thiosulphate (hypo) in development of photographic film/plate is to
Brighten the faint images
Remove metallic silver
Convert silver chloride to silver
Remove unexposed silver halide
Correct Answer :
D. Remove unexposed silver halide
Related Questions
Bleaching powder (chemically known as calcium chloro hypochlorite) is commercially produced by the action of chlorine on
Slaked lime
Soda lime
Calcium perchlorate
None of these
Highly porous refractory bricks are
Less susceptible to chemical attack by molten fluxes and gases etc
Very strong
Having very high thermal conductivity
None of these
Cation exchanger is regenerated usually with
NaOH
H2SO4
Hydrazine
Alum solution
Nickel is not used as a catalyst in the __________ reaction.
Shift conversion
Oil hydrogenation
Steaming reforming of naphtha
Ammonia cracking/dissociation
Zeolite removes both temporary as well as permanent hardness of water by precipitating calcium and magnesium present in water as insoluble zeolites. Used zeolite is regenerated by flushing with the solution of
Calcium sulphate
Sodium chloride
Sodium sulphate
Magnesium chloride
Litharge is
Lead oxide
Zinc oxide
Zinc sulphide
Cellulosic photographic material
Which of the following is the most adverse factor challenging the choice of mercury electrolytic cell process for the production of caustic soda?
High cost of mercury
High specific gravity of mercury
Non-availability of high purity mercury
Pollution of water stream by mercury
Viscosity index improver (like polystyrene or polyisobutylene) is added to lubricant to
Reduce its viscosity
Increase its viscosity
Reduce the variation in its viscosity with temperature
Increase the variation in its viscosity with temperature
H2S is scrubbed from refinery gases by absorption using
Dilute H2SO4
Ethanol amine
Chilled water
Tri-butyl phosphate
Permanent hardness of water is due to the presence of calcium & magnesium
Bi-carbonates
Sulphates & chlorides
Carbonate
None of these
The manufacture of Kraft pulp is done by a/an __________ process.
Alkaline
Acidic
Neutral
None of these
Which of the following is not a food additive?
Citric acid
Invertage
Benzoyl peroxide
Ammonium chloride
Hydrocyanic acid (HCN) is used as an insecticide for
Controlling timber degradation by ants
Controlling poultry lice
Potato beetle
Citrus fruits
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
The only commercial Fischer-Tropsch plant for producing liquid hydrocarbon fuel from coal is located at
SASOL (in South Africa)
Redcar (U.K.)
Los Angeles (U.S.A.)
Trombay (India)
Saponification number of an oil or fat
Gives an idea about its molecular weight
Is inversely proportional to its molecular weight
Detects its adulteration
All (A), (B) & (C)
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
Pick out the wrong statement.
Pasteurisation of milk involves moderate heating followed by cooling
Bakeries and breweries make use of yeasts
Enzyme is a complex nitrogenous compound
Oils and fats are alkaloids
Chemical formula of oleum is
H2SO3
H2SO4
H2S2O7
H2SO7
A cane sugar factory having sugar production rate of 10 tons/day will produce about __________ tons/day of bagasse (after consumption by the factory for heating etc.).
1
10
25
40
Pig iron is produced by blast furnaces in India using mostly the iron ore named
Hematite
Magnetite
Siderite
Chalcopyrite
Mercury electrolytic cells are preferred over diaphragm electrolytic cell (for production of caustic soda), as it
Has larger production capacity per unit cell
Consumes less power per ton of Cl2 produced
Produces high purity (70%) caustic soda directly
All (A), (B) and (C)
Haemoglobin is a/an
Amino acid
Biological catalyst
Protein
Enzyme
Pick out the wrong statement.
High early strength cement are made from materials having high silica to lime ratio
The function of gypsum in cement is to enhance its initial setting rate
Acid resistant cements are known as silicate cement
Major component of greyish Portland cement is tricalcium silicate
Phenol formaldehyde resin is used as an adhesive in making
Laminates
Card boxes
Furniture
Books
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)
Which of the following is not an antibiotic?
Penicillin
Streptomycin
Tetracycline
Quinine
Acetone is produced by catalytic dehydrogenation of
Phenol
Naphthalene
Isopropanol
Ethyl benzene
Hydrolysis of sugar is called
Hydration
Inversion
Esterification
None of these
Varnish does not contain
Thinner
Pigment
Both (A) & (B)
Neither (A) nor (B)