ইউরিয়া একটি অত্যন্ত গুরুত্বপূর্ণ নাইট্রোজেন সার। এর সূত্র হল CON_2H_4। শতাংশ গণনা করুন...
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when ethyl is heated with con. H_(2)SO_(4) at 443K ethlene is formed by
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