(A) 0.05

(B) 1

(C) 6.5

(D) 15

(A) Chlorine

(B) Irradiation of water by ultraviolet light

(C) Cation exchanger

(D) Coagulation

(A) Nitrogen is normally supplied in fertiliser either in Ammoniacal or the nitrate form, from which the soil takes it up in the form of ammonium ions or nitrate ions and forms amino acids

(B) Calcium present in the fertiliser helps in correcting the soil acidity

(C) Particle size range of a good granular fertiliser is 10-15 mesh and it contains less moisture as compared to finely divided powder form of fertiliser

(D) Ammonium nitrate fertiliser is obtained as a by-product in an integrated steel plant having byproduct coke ovens

(A) Volcanic eruptions and lightening discharges

(B) Biological decay of vegetable matter

(C) Photochemical oxidation of organic matter

(D) None of these

(A) ‘Green acid’ is the other name of phosphoric acid produced by the reaction of phosphate rock & sulphuric acid

(B) Chemically unreactive nature of red phosphorous is due to its polymeric structure

(C) Red phosphorous is the most reactive allotropic form of phosphorous

(D) Red phosphorous, which is used in the manufacture of safety matches, is converted into white phosphorous by vaporisation followed by condensation

(A) Reaction of NH3 with HNO3 to produce (NH4)2NO3 is endothermic

(B) With increase in NH3/CO2 ratio, urea yield decreases for a given temperature, pressure and total feed rate

(C) Biuret (an intermediate during urea manufacture) is toxic to seeds and animals

(D) Both

(A) Respiratory & lung disease

(B) Reduction in plant’s productivity owing to acid rain

(C) Corrosion of building materials

(D) All

(A) Benzopyrene

(B) Peroxyacetyl nitrate

(C) Carbon monoxide

(D) Sulphur dioxide

(A) 1 to 1.5

(B) 6.5 to 8

(C) 13 to 14

(D) 4 to 5

(A) Thermal power plant

(B) Petroleum refinery

(C) Nitric acid plant

(D) Sulphuric acid plant