09 - sinf chsb-4 — uzb — 1-variant

09 – sinf. chsb-4 1-variant1000002105094 1000002 1000002105094 emaktab 1000002105094 emaktab 1. (b) marganesning amfoter xossali birikmasini tanlang a) mno2 b) mno c) hmno4 d) h2mno41000002105094 emaktab 2. (b) kaliy permanganat ishqoriy muhitda (koh) oksidlovchilik xossalarini namoyon qilganda marganesning qaysi birikmasi hosil boê»ladi? a) mnso4 b) mno2 c) k2mno4 d) mn2o7 3. (b) pirit formulasini aniqlang1000002105094 emaktab a) fe3o4 b) fes2 c) feco3 d) fe2o3 4. (q) laboratoriyada oê»tkazilishi mumkin boê»lgan “sun’iy vulqon” tajribasida quyidagi reaksiya sodir boê»ladi: (nh4)2cr2o7 → cr2o3 + n2↑ + h2o 189 gramm ammoniy dixromat parchalanganda necha gramm suv hosil boê»ladi? a) 90 b) 72 c) 54 d) 108 5. (q) cr2o3 va nitrat kislota reaksiyaga kirishishi natijasida 23,8 g cr(no...

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