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
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