Kimyoviy bog‘lanish

02-10son-55.
255. Qaysi birikma ham oksidlovchi, ham qaytaruvchi bo‘la oladi?
A) vodorod sulfid B) sulfit kislota
C) sulfat kislota D) sulfat angidrid
E) natriy sulfid
02-10son-58.
256. Eritmaning 25 ml hajmidagi temir(II) sulfatni oksidlash uchun kislotali sharoitda kaliy permanganatning 0,02 M li eritmasidan 19,8 ml sarf bo‘lgan. Qaytaruvchining molyar konsentratsiyasini hisoblang.
A) 8,91^.10^-1 B) 2,97^.10^-1C) 5,94^.10^-2 D) 3,96^.10^-2
E) 7,92^.10^-2
02-11son-30.
257.
reaksiya tenglamasida 0,4 M ionlari bo‘lgan 500 ml eritmadan foydalanib, necha gramm xlor olish mumkin? Reaksiya unumini 100% deb oling.
A) 71 B) 11,2 C) 35,5 D) 142 E) 22,4
02-12son-1.
258. CuSO₄ eritmasiga Zn plastinka tushirilganda, quyida keltirilgan tenglamalardan qaysi biri sodir bo‘ladigan jarayonni to‘liq aks ettiradi?
A) Cu²⁺↔Cu+2ē B) Zn²⁺↔Zn+2ē
C) Zn+2ē D) Zn+ Cu²⁺→ Cu+ Zn²⁺
E) Cu+ Zn²⁺→ Zn+ Cu²⁺
02-12son-22.
259. Temir xromit(xrom temirtoshi) ning ko‘mir bilan qizdirilishi natijasida hosil bo‘lgan moddalardagi xrom, temir va uglerod atomlarining oksidlanish darajalarini va reaksiyaning o‘ng tomonidagi koeffitsientlar yig‘indisini toping.
A) 0; 0; +2; 7 B) +2; 0; +4; 8 C) -1; -3; 0
D) +1; +1; +5; 4 E) 0; +3; 0; 7
02-12son-51.
260. Cr(OH)₃+KBr+CO₂ lar hosil bo‘lishi uchun quyidagilardan qaysi birlarining eritmalari reaksiyaga kirishishi kerak?
A) Cr₂(SO₃)₃+KBr B) CrBr₃+KHSO₃
C) Cr(OH)₂Br+K₂SO₄ D) Cr(OH)Br₂+K₂SO₃
E) KHSO₄+CrBr₃
02-12son-56.
261. Cu₂C₂+HNO₃→Cu(NO₃)₂+CO₂+H₂O+NO₂
reaksiyada oksidlovchining koeffitsienti nechaga teng?
A) 6 B) 16 C) 10 D) 12 E) 11
03-1son-23.
262. Quyidagi reaksiya uchun koeffitsientlar yig‘indisi nechaga teng bo‘ladi?
H₂S+KMnO₄→S+MnO₂+KOH+…
A) 14 B) 20 C) 18 D) 23 E) 26
03-1son-39.
263. Quyidagi oksidlanish-qaytarilish reaksiyasida HCI ning koeffitsienti nechaga teng? HCI+K₂Cr₂O₇→CI₂+CrCI₃+H₂O+...
A) 8 B) 10 C) 13 D) 14 E) 17
03-1son-40.
264. Quyidagi reaksiyada koeffitsientlarning yig‘indisi nechaga teng bo‘ladi?
C₂H₅OH+CrO₃→Cr₂O₃+CO₂+…
A) 12 B) 18 C) 25 D) 32 E) 38
03-1son-45.
265. Quyidagi reaksiyaning molekulyar tenglamasidagi koeffitsientlarning yig‘indisi nechaga teng?
FeS₂+HNO₃=Fe⁺³+CO₂+NO₂+…
A) 25 B) 32 C) 36 D) 40 E) 45
03-3son-57.
266. KMnO₄+HCI→ tenglamani tuggalang va koeffitsientlar yig‘indisi nechaga tengligini toping.
A) 17 B) 18 C) 35 D) 20 E) 35