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  • Organik birikmalardagi kislorod atomlarining valentligi qanday?
    2
  • Etan (C2H6) tarkibidagi uglerod atomlarining oksidlanish darajalari yig‘indisini hisoblang.
    -6
  • “Izomeriya” tushunchasini fanga kim kiritgan?
    I. Berselius
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