Fertiliser Technology
Red phosphorous is changed into white phosphorous by

None of these
Vaporisation followed by condensation
Heating in presence of light
Melting under pressure

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Fertiliser Technology
Multistage operation (as in the case of catalytic oxidation of SO₂) is not carried out for NH₃ synthesis, because of

Higher pumping cost
Chances of entrainment and disturbance of catalyst bed
High cost of the high pressure vessel used for the reactor
Comparatively higher pressure drop

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