Al^(3+) ions replace Na^+ ions at the edge centres of NaCl lattice. The number of vacancies in one mole NaCl is found to bex xx 10^23 . The value of x approximately is

Al^(3+) ions replace Na^+ ions at the edge centres of NaCl lattice. Th

1.	Al^(3+) ions replace Na^+ ions at the edge centres of NaCl lattice. The number of vacancies in one mole NaCl is found to bex xx 10^23 . The value of x approximately is
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