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arsenic (As) or phosphorus (P).
2Na+ will replaced by Mg2+ ion to maintain electrical neutrality thus ahole created for lattice site for every Mg2+ ion introduce thus the defect produced will schottky defect
When ferromagnetic substance is subjected to high temperature it loses its magnetic property and become paramagnetic in nature this happen due to disorder ness in electronic arrangment.
Cadium chloride is substance which on addition to AgCl cause cation vacancy in it.