Carborundum consists mainly of
Bauxite
Silicon carbide
Boron carbide
Calcium carbide
Correct Answer :
B. Silicon carbide
Related Questions
Starting material for the production of styrene butadiene rubber (SBR) is
Ethyl alcohol
Ethylene
Both (A) & (B)
Neither (A) nor (B)
Carbon tetrachloride (CCl4) is the starting raw material for the manufacture of
Trichloroethylene
Perchloroethylene
Parathion
Methanol
Pick out the wrong statement pertaining to the soap manufacture.
Transparent soaps are made by cold process
Organic pigments are used as colouring materials in the soap manufacture
Both laundry as well as toilet soaps are manufactured by hot process
Colourless rosin is used in the manufacture of laundry soaps
Chemical name of 'alum' is
Barium sulphate
Aluminium sulphate
Aluminium chloride
Calcium sulphate
Flexible foam (for mattresses) is usually made of
PVC
Silicone
Polyurethanes
Polyamides
Contact process of sulphuric acid manufacture
Yields acid of higher concentration than chamber process
Yields acids of lower concentration than chamber process
Is obsolete
Eliminates absorber
Hydrogenation of vegetable oils is a/an __________ reaction.
Endothermic
Autocatalytic
Exothermic
Homogenous
The combustion reaction, C + O2 = CO2, is
Exothermic
Endothermic
Autocatalytic
None of these
Phenol formaldehyde
Employs addition polymerisation
Employs condensation polymerisation
Is a monomer
Is an abrasive material
Which oil is preferred for paint manufacture?
Drying oil
Non-drying oil
Semi-drying oil
Saturated oil
Oils are partially hydrogenated (not fully) to manufacture Vanaspati, because fully saturated solidified oils
Cause cholesterol build up and blood clotting
Are prone to rancid oxidation
Always contain some amount of nickel (as their complete removal is very difficult)
Have affinity to retain harmful sulphur compounds
Widely used method for the conditioning of boiler feed water is the
Cold lime process
Coagulation
Hot-lime soda process
Sequestration
Thorium is mainly used
For the manufacture of gas mantles
As a fissile fuel in a nuclear reactor
In the manufacture of hydrogen bomb
In the treatment of cancer
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
Yellow phosphorus is transported under
Air
Water
Nitrogen
Helium
Electro deposition of metals i.e. electroplating is never done on
Metals
Alloys
Refractories
Non-metals
Sucrose content in cane sugar may be around __________ percent.
50
70
95
80
Enamels
Give good glossy finish
Are same as varnish
Are prepared from non-drying oil
Do not contain pigment
Alcohol is produced by the
Oxidation of an aldehyde
Hydrolysis of an ether
Esterification of a fat
None of these
CaSO4 . ½H2O is known as
Blue vitriol
Plaster of Paris
Gypsum
Zeolite
99.5% purity oxygen is used in
Cutting and welding by oxy-acetylene flame
Hospitals for medicinal purposes
Gas masks and artificial breathing apparatus
All (A), (B), and (C)
Alkylbenzene sulfonate (ABS) is a
Detergent
Rubber
Pesticide
Polyester
The difference between saponification value and acid value is
Called ester value
Always negative
Constant for all fatty oils
None of these
Isopropyl benzene produced by alkylation of benzene with propylene is known as
Neoprene
Cumene
Gelatin
Mercaptans
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
Mercury electrolytic cell produces 50-70% NaOH solution. Its operating temperature is __________ °C.
25
60-70
150-200
250-300
Mercury cells for caustic soda manufacture, compared to diaphragm cells
Require lower initial investment
Require more power
Produce lower concentration NaOH
None of these
Which of the following is not a food additive?
Citric acid
Invertage
Benzoyl peroxide
Ammonium chloride
Which of the following, when pyrolysed, produces Perchloroethylene?
Ethylene dichloride
Chlorobenzene
Carbon tetrachloride
Chlorinated paraffin
Thermosetting materials
Are cross-linked molecules
Soften on application of heat
Are solvent soluble
None of these