If plant material is dried and burnt in a crucible, the residue would contain

30g of magnesium and 30g of oxygen are reacted and the residual mixture contains

Some KH_(2)PO_(2) is dissolved in D_(2)O . The resulting solution is dried. The residue obtained contains

Magistral is the burnt pyrites containing

A white residue is obtained when metallic Mg is burnt in air. This residue when heated with water emits an ammoniacal smell. Explain these observations.

The plants growing on burnt soil are called as Pyrophilous.