Vulcanisation of rubber
Decreases its tensile strength
Increases its ozone & oxygen reactivity
Increases its oil & solvent resistance
Converts its plasticity into elasticity
Correct Answer :
D. Converts its plasticity into elasticity
Related Questions
Carborundum consists mainly of
Bauxite
Silicon carbide
Boron carbide
Calcium carbide
Exothermic condensation reaction of monochlorobenzene with chloral in presence of 20% oleum as catalyst produces DDT. The reaction temperature is maintained at __________ °C.
15-30
90-100
250-300
< 0
The main component of Pyrex glass is
Zinc
Lead
Boron
Selenium
Zeolite is a/an
Naturally occuring clay which is capable of exchanging cations
Abrasive material
Catalyst used in shift conversion
None of these
Bromine is used in the preparation of
Fire extinguishing compounds
Fire proofing agents
Dyes and antiknock compounds
All (A), (B) and (C)
Phosphate rock is a raw material for the manufacture of
Phosphoric acid
Phosphorous
Superphosphates
All (A), (B) and (C)
Hydrogenation of oil takes place in a/an __________ reactor.
Autothermal
Trickle bed
Plug flow
None of these
Pick out the wrong statement pertaining to nitric acid.
About 90% of nitric acid is manufactured by Ostwald's process
It is a strong mono basic acid which reacts with almost all the metals except noble metals
Yellow color of impure nitric acid is because of dissolved oxides of nitrogen (mainly NO2)
Arc process of nitric acid manufacture is economical as compared to Ostwald's process
Coloured glass is obtained by mixing of colored salts. Addition of __________ oxide is done to impart greenish blue color to the glass.
Chromium
Arsenic
Copper
Manganese
The main aim behind cooling the digested chip at the bottom portion of the digestor by injecting cold black liquor is to
Avoid mechanical weakening of fibre
Remove lignin by way of crystallisation
Increase the cellulose content
None of these
Salt is added in the kettle during soap manufacture to separate
Soap from lye
Glycerine from lye
The metallic soap
The unsaponified fat from soap
An oil is converted into fat by its
Hydrogenation
Hydrolysis
Hydrocracking
Hydration
Which of the following is not required in the manufacture of soda ash by Solvay process?
Ammonia
Limestone
Nitric acid
None of these
Ultimate analysis of coal determines its __________ content.
Carbon, hydrogen, nitrogen & sulphur
Carbon, ash, sulphur & nitrogen
Carbon, sulphur, volatile matter & ash
Carbon, volatile matter, ash & moisture
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
Catalyst used in the manufacture of sulphuric acid by chamber & contact processes are respectively
V2O5 & Cr2O3.
Oxides of nitrogen & Cr2O3
V2O5 on a porous carrier & oxides of nitrogen
Oxides of nitrogen & V2O5 on a porous carrier
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)
__________ paper is used in the manufacture of newsprint paper.
Ground-wood
Board
Tissue
Wrapping
Fusel oil is a/an
Essential oil
Extract from medicinal herbs
Mixture of higher molecular weight alcohols (a by-product obtained during production of alcohol from molasses).
None of these
DDT should not be allowed to come in contact with iron (during its manufacture) to
Avoid its decomposition
Prevent sulphonation of the monochlorobenzene by the acid catalyst
Achieve non-hygroscopic property
None of these
Fermentator temperature during production of alcohol from molasses is around __________ °C.
5
30
130
300
L.D. converter is used in the production of
Pig iron
Steel
Copper
Zinc
Sea weeds are an important source of
Fluorine
Chlorine
Bromine
Iodine
__________ glass has the lowest co-efficient of thermal expansion and hence is more heat resistant.
Pyrex
Soda lime
Lead
High silica
A substance produced by a living organism and capable of anti-microbial activity is called a/an
Antibiotic
Antiseptic
Disinfectant
None of these
Which is the main reducing agent during production of iron from iron ore in a blast furnace?
C
CO
CO2
H2
Roasting of metallurgical ores is done mainly to
Dehydrate it
Sinter the ore
Remove CO2 & H2O
Remove arsenic & sulphur
Ceramics are produced from silicates or clayish materials: Which of the following is not a ceramic material?
Slag cement
Glasses
Porcelain/Potteries
Teflon
Commonly used glass is known as the __________ glass.
Flint
Hard
Pyrex
Soda
The catalyst used in the manufacture of DDT is
Alumina
Silica
20% oleum
Aluminium chloride