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Chemistry Topic Wise question with answer

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Question #89,555
Chemistry Topic Wise हिन्दी MCQ (SSC 10+2 CHSL 09.01.17, 4.15 pm)

Q.एक ऐसी अभिक्रिया जिसमें एक साथ ऑक्सीकरण और अवकरण होता है, उसे क्या कहते हैं?