As potassium is so reactive that it reacts vigorously with water or catches fire. Than how it can be used as a fertilizer for plants as it is added to the soil does it not reacts with water used for irrigation of plants it must catch fire there also .

Carbonate ion is also known as a:

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Potash (potassium carbonate) is used as a fertilizer. It is also known as:

The correct option is D pearl ashPotassium carbonate, (K2CO3), is the primary component of potash and the more refined pearl ash or salts of tartar. Pearl ash was created by baking potash in a kiln to remove impurities. The fine, white powder remaining was the pearl ash.

The correct option is D pearl ash
Potassium carbonate, $(K_{2} C O_{3})$ , is the primary component of potash and the more refined pearl ash or salts of tartar. Pearl ash was created by baking potash in a kiln to remove impurities. The fine, white powder remaining was the pearl ash.