______________ content of the phosphate rock is the pollutant of primary interest in a phosphatic fertiliser plant ?

A. Diffusion of
B. Centrifugal force on
C. Gravitational force on
D. Electrostatic force on

A. 5
B. 50
C. 500
D. 5000

A. 35
B. 75
C. 95
D. 105

A. 0.002
B. 0.2
C. 1.2
D. 4.8

A. Conversion of CO into CO2 in the second compartment
B. Conversion of NOx into N2 and NH3 in the first compartment
C. Oxidation of unburnt hydrocarbon fuel in the second compartment
D. All A., B. and C.

A. 0.1
B. 25
C. 100
D. 1000