Fertiliser Technology
Red phosphorous is changed into white phosphorous by

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

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Fertiliser Technology
Which of the following set of conditions is favourable for the maximum yield of ammonia by Haber's process?

Low pressure, high reactants concentration, low temperature
High pressure, low reactants concentration, low temperature
High pressure, low reactants concentration, high temperature
High pressure, high reactants concentration, low temperature

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