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Coffin kya ha

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Coffin kya ha

Posted by Mohit Lama 5 years, 1 month ago

CBSE > Class 11 > शारीरिक शिक्षा

1 answers

Sia ? 5 years, 1 month ago

कैफीन (Caffeine) एक कड़वी, सफेद क्रिस्टलाभ एक्सेंथाइन एलकेलॉइड (क्षाराभ) है, जो एक मनोस्फूर्तिदायक या साइकोएक्टिव (मस्तिष्क को प्रभावित करनेवाली) उत्तेजक औषधि है। एक जर्मन रसायनशास्त्री फ्रेडरिक फर्डीनेंड रंज ने 1819 में कैफीन की खोज की थी। उदाहरण: कॉफ़ी।

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Posted by Anup Sarkar 8 months, 2 weeks ago

CBSE > Class 11 > शारीरिक शिक्षा