railway RRB Junior Hindi Translator 2025 Mock Test Series General Science Chemistry Basic Concepts of Chemistry

किस वैज्ञानिक ने पदार्थ की प्रकृति के बारे में मूल सिद्धांत प्रदान किया?

1
डेमोक्रिटस
2
जोसेफ प्राउस्ट
3
जॉन डाल्टन
4
एंटोनी लवोसियर
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