1. Tenglamasi CuCO3 Cu(OH)2

82. 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
83. Quyidagi oksidlanish – qaytarilish reaksiyasida HCl ning koeffitsienti nechaga teng? HCl+K₂Cr₂O₇→Cl₂+CrCl₃+H₂O+…
A) 8 B) 10 C) 13 D) 14 E) 17
84. Quyidagi reaksiyada koeffitsientlarning yig‘indisi nechaga teng bo‘ladi? C₂H₅OH+CrO₃→Cr₂O₃+CO₂+… A) 12 B) 18 C) 25 D) 32 E) 38
85. Quyidagi reaksiyaning molekulyar tenglamasidagi koeffitsientlarning yig‘indisi nechaga teng?
A) 25 B) 32 C) 36 D) 40 E) 45
86. Quyidagi reaksiyaning koeffitsientlar yig‘indisini aniqlang.
Zn+H₂SO₄→ZnSO₄+H₂S+S+SO₂+H₂O A) 38 B) 37 C) 40 D) 19 E) 21
87. Quyidagi HNO₃+Zn→Zn(NO₃)₂+NH₄NO₃+H₂O tenglamaning chap va o‘ng tomonidagi koeffitsientlari nisbatini aniqlang.
A) 8:14 B) 14:8 C) 10:12 D) 12:10 E) 8:10
88. Quyidagi reaksiyalardan qaysilarida erkin yod ajralib chiqadi?
1) KJ+KClO₃+H₂SO₄→; 2) KMnO₄+KJ+H₂SO₄→; 3) MnO₂+KJ+H₂SO₄→;
4) KJ+Cl₂→; 5) KNO₂+KJ+H₂SO₄→; 6) H₂O₂+KJ→;
A) 1,2,3 B) 2,3,4,5 C) 3,4,5,6 D) 2,4,5,6 E) 1,2,3,4,5,6