7-sinf chsb-2

7-sinf chsb-2 1-variant 1.(b) kislorodning molekulyar massasini hisoblang. a) 16 b) 32 c) 18 d) 34 2. (b) suvning molekulyar massasi qancha? a) 16 b) 18 c) 20 d) 22 3.(b) ftorning kimyoviy belgisini aniqlang. a) fl b) f c) ft d) fe 4. (q) modda miqdorining asosiy birligini aniqlang. a) kilogramm b) litr c) mol d) gramm 5. (q) mis (ii) oksidining kimyoviy formulasini aniqlang. a) cuo₂ b) cu₂o c) cuo d) cu₂o₃ 6. (q) temir (ii) sulfid hosil bo‘lishi uchun to‘g‘ri tenglashtirilgan reaksiya qaysi? a) fe + o₂ → feo b) fe + s → fes c) feo + s → fe₂s₃ d) fes + o₂ → feso₄ 7. (q) kremniy dioksid (sio₂) molekulasidagi kislorodning massa ulushi (%) …

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