Nitroglitserinning spirtdagi necha LI eritmasidan yurak kasalliklarida dori-darmon sifatida foydalaniladi? A b c d 5

Benzol, toluol va kumoldan iborat 0.7 mol aralashma kislotali sharoitda KMnO₄ bilan oksidlanganda 48.8 gr benzoy kislota hosil bo’lsa, boshlang’ich aralashmadagi benzolning hajmiy ulushini (%) toping. A) 43 B) 45 C) 57 D) 55

53 gr aromatic uglevodorod KMnO₄ bilan oksidlanishidan hosil bo’lgan aromatic kislotani neytrallash uchun 140 gr 40% li KOH eritmasi sarflangan bo’lsa, boshlang’ich aromatic uglevodorod(lar) strukturasini aniqlang. A) etilbenzol B) propilbenzol C) kumol D) p-ksilol

23.5 gr fenol bromli suv bilan reaksiyaga kirishganda hosil bo’lgan reaksion aralahmani neytrallash uchun 20% li (p=1.2 gr/ml) NaOH eritmasidan qancha hajm (ml) talab etiladi? A) 200 B) 166.67 C) 41.67 D) 125

Reaksiya unumi 40% bo’lganda 15.84 gr 1,2-dibrom-1-feniletan olish uchun necha gramm stirol zarur bo’ladi? A) 14.2 B) 23.4 C) 15.6 D) 22.8