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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