1. Heating of orthophosphoric acid to about 900°C, produces
2. A potassic fertiliser contains 50% K₂O. It could be
3. Liquid ammonia is not used as such a fertiliser in tropical countries like India, because
4. Which one of the following is used as a nitrogenous fertiliser, as a weed killer in the onion fields and for correcting acidic soils?
5. Multistage operation (as in the case of catalytic oxidation of SO₂) is not carried out for NH₃ synthesis, because of
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