Explain using Physical properties of the gas why ammonia is not collected by downward delivery
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Both ammonia and chlorine are soluble in water and hence, would dissolve in water if substance X is water and could not be collected. Ammonia gas would react with concentrated sulphuric acid to produce a salt and as ammonia is less dense than air, it should not be collected via a downwards delivery method.

1. a tropical dry forest carries out more rapid nutrient cycling

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