Kimyoviy bog‘lanish

99-7son-21.
304. Mg+O₂=MgO reaksiya turini aniqlang.
A) birikish: oksidlanish: qaytar
B) birikish: oksidlanish-qaytarilish: endotermik
C) oksidlanish-qaytarilish: birikish: qaytar
D) birikish: oksidlanish-qaytarilish
E) birikish: oksidlanish-qaytarilish: ekzotermik
99-10son-15.
305. Etilbenzol kaliy permanganat bilan kislotali sharoitda oksidlanganda necha mol uglerod(IV) oksid hosil bo‘ladi va reaksiyada necha mol kaliy permanganat sarf bo‘ladi?
A) 10 va 15 B) 20 va 10 C) 5 va 12 D) 44 va 40
E) 40 va 42
99-1son-26.
306. Quyidagi reaksiya tenglamasida qatnashuvchi moddalar koeffitsientlarining ketma-ketligini aniqlang: C₆H₅CH₃+KMnO₄→C₆H₅COOK+MnO₂+KOH+H₂O
A) 1,2,1,2,1,1 B) 2,3,2,3,1,2 C) 3,2,3,2,1,2
D) 2,2,2,2,1,2 E) 2,1,2,1,1,3
98-9son-65.
307. Quyidagi reaksiya tenglamasida qatnashuvchi moddalar koeffitsientlarining ketma-ketligini aniqlang: C₂H₅OH+KMnO₄+H₂SO₄→CH₃COOH+MnSO₄+K₂SO₄+H₂O
A) 5,4,6,5,4,2,11 B) 5,2,3,5,2,1,12
C) 4,6,5,4,4,8,11 D) 2,3,5,2,3,6,12
E) 5,6,4,4,5,2,11
98-9son-69.
308. Quyida reaksiya tenglamalarining qaysi biri to‘g‘ri tenglashtirilgan?
1) 5C₆H₅C₂H₅+24KMnO₄+36H₂SO₄→
3C₆H₅COOH+12K₂SO₄+24MnSO₄+52H₂O+19CO₂
2) 5C₆H₅C₂H₅+30KMnO₄+45H₂SO₄→
2C₆H₅COOH+15K₂SO₄+30MnSO₄+64H₂O+26CO₂
3) 5C₆H₅C₂H₅+12KMnO₄+18H₂SO₄→
5C₆H₅COOH+6K₂SO₄+12MnSO₄+28H₂O+5CO₂
A) 1 B) 2 C) 3 D) 1 va 2 E) 2 va 3
97-12son-58.
309. Quyidagi oksidlanish-qaytarilish reaksiyasi tenglamasini tugatib, uning o‘ng va chap tomonidagi moddalar koeffitsientlarining nisbatlarini toping.
K₂Cr₂O₇+K₂SO₃+H₂SO₄=Cr₂(SO₄)₃+K₂SO₄+…
A) 8:9 B) 7:11 C) 8:12 D) 9:8 E) 11:7