W lien \( \mathrm{NaCl} \) is dopped with \( 10^{-5} \) mole \( \% \) of \( \mathrm{SrCl}_{2} \)...

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W lien \( \mathrm{NaCl} \) is dopped with \( 10^{-5} \) mole \( \% \) of \( \mathrm{SrCl}_{2} \), what is the no. of cationic vacancies?
(a) \( 10^{-5} \times N_{A} \)
(b) \( 10^{-7} \times N_{A} \)
(c) \( 2 \times 10^{-7} N_{A} \)
(d) None of these
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