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एक आयनिक पदार्थ के फलक केंद्रित क्रिस्टल जालक की कोर की लम्बाई 508 pm है ? यदि धनायन की त्रिज्या 110 pm हो तो ऋणायन की त्रिज्या होगी :
A. 144 pm
B. 288 pm
C. 618 pm
D. 398 pm

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Correct Answer - A
fcc संरचना के लिए, `(r^(+) + r^(-)) = (a)/(2) = (508)/(2)=254` pm
`r^(+) = 110" "rArr" "r^(-) = 254 - 110 = 144` pm

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