Kimyoviy bog‘lanish

98-11son-24.
134. Quyidagi reaksiyada qaytaruvchining oldidagi koeffitsientni aniqlang.
KMnO₄+H₂O₂+H₂SO₄→MnSO₄+K₂SO₄+O₂+H₂O
A) 4 B) 5 C) 6 D) 7 E) 8
98-11son-25.
135. Quyidagi reaksiyaning o‘ng tomonidagi koeffitsientlar yig‘indisi nechaga teng?
Mn₃O₄+Al→Al₂O₃+Mn
A) 11 B) 13 C) 14 D) 16 E) 19
98-11son-26.
136. Quyidagi reaksiyaning chap tomonidagi koeffitsientlar yig‘indisi nechaga teng?
Mn₃O₄+KClO₃+K₂CO₃→K₂MnO₄+KCl+CO₂
A) 13 B) 15 C) 17 D) 21 E) 23
98-11son-27.
137. Quyidagi reaksiyaning barcha koeffitsientlari yig‘indisi nechaga teng?
As₂S₃+HNO₃→H₃AsO₄+CO₂+NO₂+H₂O
A) 27 B) 38 C) 49 D) 58 E) 63
98-11son-28.
138. Quyidagi reaksiyada oksidlovchi oldidagi koeffitsient nechaga teng?
NH₃+KMnO₄+KOH→KNO₃+K₂MnO₄+H₂O
A) 5 B) 2 C) 8 D) 11 E) 13
98-11son-29.
139. Quyidagi reaksiyada chap tomondagi koeffitsientlar yig‘indisi nechaga teng?
H₂O₂+CrCl₃+KOH→K₂CrO₄+KCl+H₂O
A) 13 B) 15 C) 18 D) 21 E) 5
98-11son-30.
140. Metafosfat kislotaning rux bilan reaksiyasida qaysi modda qaytaruvchi bo‘ladi?
A) vodorod B) fosfor C) rux D) kislorod
E) qaytaruvchi yo‘q
98-12son-49.
141. Quyidagi reaksiyada oksidlovchi oldidagi koeffitsientni ko‘rsating.
H₂S+HNO₃=H₂SO₄+NO+H₂O
A) 6 B) 4 C) 8 D) 2 E) 5
99-1son-14.
142. Quyidagi oksidlanish-qaytarilish reaksiyalaridan qaysi biri disproporsiyalanish reaksiyasi hisoblanadi?
A) NH₄NO₃ →N₂O+2H₂O
B) MnO₂+HCI→MnCI₂+CI₂+H₂O
C) AgNO₃→Ag+NO₂+O₂
D) KOH+C→K₂S+K₂SO₃+H₂O
E) CuO+H₂→Cu+H₂O