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A crystal of $NaCl$ is doped with a small amount of $SrCl X_{2}$ . Which statements are correct?

AEach $Sr X^{2 +}$ occupies a $Na X^{+}$ site and creates one cation vacancy.
BThe crystal remains electrically neutral.
CThe ionic conductivity of the crystal increases.
DAnion vacancies are created in equal number to the $Sr X^{2 +}$ ions.

Answer: A, B, C

Sr X^{2 +}

carries two positive charges and replaces one

Na X^{+}

; to maintain neutrality one neighbouring cationic site stays vacant (true, true). The vacancies let ions migrate, so conductivity rises (true). No anion vacancies are required (false).

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