Which of the following is an endothermic reaction?
Absorption of SO3 in 98% H2SO4
C + H2O = CO + H2
Thermal dissociation of iron pyrites
Both (B) and (C)
Correct Answer :
D. Both (B) and (C)
Related Questions
Margarine is a/an
Fat
Explosive
Plasticiser
Rocket propellant
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)
Portland cement consists mainly of
CaO & SiO2
SiO2 & Al2O3
CaO & Al2O3
CaO & Fe2O3
Presence of sodium tripolyphosphate (an additive) in synthetic detergent
Facilitates its use even in hard water (by sequestering the water-hardening Ca & Mg ions)
Inhibits its corrosive effects
Does not allow redeposition of dirt on the cleaned surface
None of these
Widely used method for the conditioning of boiler feed water is the
Cold lime process
Coagulation
Hot-lime soda process
Sequestration
Ethyl alcohol cannot be produced
From waste sulphite substrate of paper mills
By Esterification and hydrolysis of ethylene
From molasses
None of these
Nitro-glycerine absorbed in wood flour, sodium nitrate or ammonium nitrate is commercially used as controlled explosive called dynamite. The raw material used for its manufacture are glycerine, nitric acid and
Sulphuric acid
Phosphoric acid
Hydrochloric acid
Hydrofluoric acid
Enzymes are organic catalysts used in the __________ reactions.
Chemical
Biochemical
Photochemical
Electrochemical
Catalytic oxidation of naphthalene produces
Styrene
Phenol
Phthalic anhydride
None of these
Solvent used for extraction of oil is
Hexane
Methyl ethyl ketone
Furfural
None of these
Phenol is mainly used
To produce benzene
To produce phenol formaldehyde
To produce polyester resin
As a plasticiser for unsaturated polyester
The main use of activated carbon in water treatment is to control
Bacterial growth
Taste and odour
Turbidity
None of these
Sulphuric acid is mainly used in the __________ industry.
Fertiliser
Steel
Paper
Paint
Chloramines are used in water treatment for
Disinfection and control of taste & odour
Corrosion control
Removing turbidity
Control of bacteria
Hydrazine is largely used
As a starting material for 'hypo'
In photographic industry
As rocket fuel
In printing industry
Fourdrinier machine is used in the manufacture of
Sugar
Paper
Alcohol from molasses
Phenol formaldehyde
Polythene is a/an __________ polymerisation product.
Addition
Condensation
Thermosetting
None of these
Presence of carbonaceous matter in the sewage
Causes reduction in its dissolved oxygen content thereby endangering the life of aquatic creatures
Reduces sulphate ions to sulphides causing obnoxious smell
Increases the quantity of chlorine used for its purification
All (A), (B) and (C)
90% of the caprolactam is converted to nylon-6 on its condensation polymerisation in the reactor maintained at __________ °C.
< 0
10-30
250-280
500-600
The major constituents of glass are
Lime, clay and soda ash
Sand, lime and soda ash
Silica, alumina and clay
Silica, alumina and soda ash
Nylon-6 is manufactured from
Caprolactam
Hexamethylene diamine and adipic acid
Hexamethylene diamine and Maleic anhydride
Hexamethylene diamine and Sebacic acid
The purpose of tanning in leather industry is to
Stiffen the leather
Smoothen the leather
Make it flexible
Impart water resistance
Carbon disulphide is mainly used in the production of
Viscose rayon
Corundum
Plasticiser for unsaturated polyester
Paints
Insulin is an __________ drug.
Anti-malarial
Anti-TB
Antibiotic
None of these
Sea water contains about __________ ppm of bromine.
5
70
500
1700
Styrene is produced from ethyl benzene by the process of
Dehydrogenation
Oxidation
Alkylation
Dehydration
Aryl benzene sulphonate (ABS) is a
Detergent
Plasticiser for unsaturated polyester
Starting material for the synthesis of glycerine
Coating ingredient for photographic film
Stereospecific agents are exemplified by
Radiation
Supported metal oxide catalysts
Ziegler catalysts
All (A), (B) & (C)
Rosin soap is added during paper manufacture to
Impart adhesive properties
Improve opacity
Impart resistance to penetration by liquids
None of these
Which is the main reducing agent during production of iron from iron ore in a blast furnace?
C
CO
CO2
H2