Ammonia reacts with CO₂ to form urea, and with HNO₃ to form ammonium nitrate, both key nitrogenous fertilizers. Glass uses Na₂CO₃; cement uses CaCO₃/clay; soap uses NaOH.
Explanation:
Permanent hardness (due to CaSO₄ etc.) can be removed by adding Na₂CO₃, which precipitates CaCO₃. Boiling only removes temporary hardness. Ion exchange and calgon also work.
Explanation:
In displacement reactions, a more reactive element displaces a less reactive one from its compound. Here, iron (more reactive than copper) displaces copper from copper sulfate. A is combination; B is decomposition; D is neutralization (double displacement).
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