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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ss108

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

AThe crystal as a whole remains electrically neutral.
BThe number of cationic vacancies equals the number of $Sr X^{2 +}$ ions introduced.
CEach $Sr X^{2 +}$ occupies a $Na X^{+}$ site and creates one cationic vacancy.
DThe defect created is a Schottky defect.

Answer: A, B, C

One

Sr X^{2 +}

carries the charge of two

Na X^{+}

, so it takes one site and leaves a second site vacant. Charge neutrality holds and vacancies equal dopant ions. Since no anion vacancy is created, it is an impurity defect, not a Schottky defect.

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