______________________ of quicklime produces slaked lime ?
(A) Hydration
(B) Dehydration
(C) Hydrogenation
(D) None of these
Dechlorination of treated water is necessary to __________________?
(A) Remove residual turbidity
(B) Reduce the bacterial load on filter
(C) Control taste and odour
(D) Remove chlorinous taste
Presence of carbonaceous matter in the sewage____________________?
(A) Causes reduction in its dissolved oxygen content thereby endangering the life of aquatic creatures
(B) Reduces sulphate ions to sulphides causing obnoxious smell
(C) Increases the quantity of chlorine used for its purification
(D) All A,
Lithophane is ___________________?
(A) Explosive
(B) White lead
(C) Filter aid
(D) ZnS (white pigment)
Phenol formaldehyde____________________?
(A) Employs addition polymerisation
(B) Employs condensation polymerisation
(C) Is a monomer
(D) Is an abrasive material
Blue colour is imparted to glass by the addition of__________________?
(A) FeSO4
(B) PbO
(C) CaO
(D) NaOH
In the manufacture of sulphuric acid from elemental sulphur, the following sequence of major operations is followed ?
(A) Furnace → converter → absorber
(B) Furnace → evaporator → absorber
(C) Furnace → converter → evaporator
(D) Converter → furnace → absorber
Styrene (a monomer for the production of polystyrene) is commercially produced by ____________________?
(A) Catalytic dehydrogenation of ethyl benzene
(B) Dehydration of ethyl alcohol followed by hydrogenation
(C) Reacting ethylene oxide with acetaldehyde
(D) Fermentation of starch
Carboxymethyl cellulose (CMC) is added in detergents to_________________?
(A) Prevent redeposition of soil on cleaned surface
(B) Act as optical brightening agent
(C) Inhibit corrosion in washing machines made of aluminium
(D) None of these
Carborundum consists mainly of_________________?
(A) Bauxite
(B) Silicon carbide
(C) Boron carbide
(D) Calcium carbide