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

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

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Fertiliser Technology
Plant tranquillisers

Cause early maturation of plants
Produce seedless fruit
Accelerate ripening of food and grain
Hold back stem growth and halt plants at a desired height

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