Question
a.
Dehydration of ammonium carbamate to produce urea is endothermic.
b.
Direct use of liquid ammonia as a fertiliser for a tropical country like India is suitable.
c.
Gypsum (CaSO₄. 2H₂O) is obtained as a by-product in the wet process for manufacture of ortho-phosphoric acid.
d.
Phosphate rock when reacted with dilute H₂SO₄ produces superphosphate.
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