- (A) Remove residual turbidity
- (B) Reduce the bacterial load on filter
- (C) Control taste and odour
- (D) Remove chlorinous taste
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- (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,
- (A) Explosive
- (B) White lead
- (C) Filter aid
- (D) ZnS (white pigment)
- (A) Employs addition polymerisation
- (B) Employs condensation polymerisation
- (C) Is a monomer
- (D) Is an abrasive material
- (A) FeSO4
- (B) PbO
- (C) CaO
- (D) NaOH
- (A) Furnace → converter → absorber
- (B) Furnace → evaporator → absorber
- (C) Furnace → converter → evaporator
- (D) Converter → furnace → absorber
- (A) Catalytic dehydrogenation of ethyl benzene
- (B) Dehydration of ethyl alcohol followed by hydrogenation
- (C) Reacting ethylene oxide with acetaldehyde
- (D) Fermentation of starch
- (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
- (A) Bauxite
- (B) Silicon carbide
- (C) Boron carbide
- (D) Calcium carbide
- (A) Hard water contains sulphate
- (B) They form insoluble calcium soaps which precipitate
- (C) They attract back the removed dirt
- (D) None of these
