Kimyoviy bog‘lanish

03-5son-52.
267. K₂Cr₂O₇ dagi xromning oksidlanish darajasini aniqlang.
A) +7 B) +5 C) +6 D) -6 E) -7
03-7son-34.
268. Oksidlovchilar qatorini aniqlang.
A) KMnO₄, O₃, HBr B) K₂CrO₄, HNO₃, K₂Cr₂O₇
C) H₂O₂, HNO₃, K₂Cr₂O₇ D) CHCI₂, HBr, HCI
E) KMnO₄, H₂SO₃, NH₃
03-7son-35.
269. Quyidagi
KMnO₄+H₂SO₄+Na₂SO₃=MnSO₄+K₂SO₄+H₂O
reaksiyaning koeffitsientlar yig‘indisini toping?
A) 20 B) 21 C) 19 D) 15 E) 17
03-7son-36.
270. Quyidagi reaksiyaning koeffitsientlar yig‘indisini aniqlang.
Zn+H₂SO₄=ZnSO₄+H₂S+C+CO₂+H₂O
A) 38 B) 37 C) 40 D) 19 E) 21
03-7son-55.
271. Quyidagi HNO₃+Zn=Zn(NO₃)₂+NH₄NO₃+H₂O tenglamaning chap va o‘ng tomondagi koeffitsientlari nisbatini aniqlang.
A) 8:14 B) 14:8 C) 10:12 D) 12:10 E) 8:10
03-8son-7.
272. Quyidagi Zn+H₂SO₄=ZnSO₄+H₂S+C+CO₂+H₂O reaksiya uchun 65 g rux olingan bo‘lsa, qancha hajm (l) gaz ajraladi?
A) 5,6 B) 11,2 C) 22,4 D) 44,8 E) 56,0
03-8son-10.
273. Quyidagi reaksiya tenglamasini tugallang va koeffitsientlar yig‘indisini toping.
KMnO₄+H₂SO₄+HNO₂→
A) 22 B) 20 C) 35 D) 30 E) 40
03-10son-35.
274. Quyidagi reaksiya tenglamasini tugallang va koeffitsientlar yig‘indisini toping. Zn+H₂SO₄→
A) 32 B) 42 C) 35 D) 30 E) 40
03-10son-36.
275. Quyidagi reaksiya tenglamasini tugallang va koeffitsientlar yig‘indisini toping. Zn+H₂SO_4(kons)→
A) 2 B) 10 C) 19 D) 11 E) 9