Fertiliser Technology
Urea is a better fertilizer than ammonium sulphate, because

It is not poisonous
It is cheaper
Nitrogen content is higher
It is easy to manufacture

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Fertiliser Technology
Though kinetics of ammonia synthesis dictates the use of low temperature for high equilibrium conversion, yet it is kept moderately high (550°C), because at low temperature

Very high pressure is required resulting in costly pressure vessel
None of these
Space velocity of gas is very low resulting in decreased conversion
Rate of reaction is very low

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