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एक द्विअंगी `(A^(+) B^(-))` की संरचना रॉक साल्ट सदृश है । यदि कोर लम्बाई 400 pm हो तथा धनायन की त्रिज्या 75 pm हो तो ऋणायन की त्रिज्या होगी :

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एक द्विअंगी `(A^(+) B^(-))` की संरचना रॉक साल्ट सदृश है । यदि कोर लम्बाई 400 pm हो तथा धनायन की त्रिज्या 75 pm हो तो ऋणायन की त्रिज्या होगी :
A. 100 pm
B. 125 pm
C. 250 pm
D. 325 pm

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Correct Answer - B
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