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एक प्रथम कोटि की अभिक्रिया 32 मिनट में 75 % पूर्ण होती है। इसके 50 % पूर्ण होने में लगा समय होगा।
A. ` 16`मिनट
B. 8 मिनट
C. 4 मिनट
D. 32 मिनट

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अभिक्रिया दो अर्ध्द आयुकाल में 75% पूर्ण होती है। अर्थात `2xx t_(1//2) =32` मिनट या `t_(1//2) =16 ` मिनट

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