engineering recuitment NMDC Maintenance Assistant Fitter 2021 Mock Test General Science Chemistry Chemistry in Everyday Life

वह जहरीला पदार्थ, जो  तम्बाकू का मुख्य घटक है, है?

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एस्पिरिन
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निकोटीन
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मॉर्फिन
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रिसर्पिन
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