Fertiliser Technology
In the manufacture of orthophosphoric acid by strong H₂SO₄ leaching wet process, keeping the reactor temperature above 100°C, results in the formation of undesriable

Metaphosphoric acid
All of these
CaSO₄ .½H₂O and CaSO₄ crystals
Pyrophosphoric acid

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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

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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