Kimyo 8 – sinf

Kimyo 8 – sinf I variant
1. Sulfat kislota bilan reaksiyaga kirishadigan moddalarni ko’rsating.
1-KOH, 2-MgO, 3-HCl, 4-P₂O₅, 5-Al₂O₃, 6-BaO, 7-CrO₃
A) 1,4,5,6 B) 1,2,5,6 C) 2,4,5,7 D) 4,5,6,7
2. 3,75 mol K₂SO₄ tuzining massasini, molekula sonini va tarkibidagi kislorod atom sonini aniqlang.
A) 652, 5 g, 22,57 * 10²³, 90,3 * 10²³ B) 552, 5 g, 12,57 * 10²³, 80,3 * 10²³
C) 752, 5 g, 32,57 * 10²³, 88,3 * 10²³ D) 452, 5 g, 62,57 * 10²³, 90,3 * 10²³
3. Berilgan reaksiyalar ichida oksidlanish – qaytarilish reaksiyasini ko’rsating.
A) CaCO₃ = B) NaOH + Al(OH)₃= C) MgO + HCl = D) Zn + HCl =
4.Asosli oksidlar qatorini ko’rsating.
A) K₂O, SO₃, Al₂O₃ B) Na₂O, MgO, BaO C) Mn₂O₇, P₂O₅, CO₂ D) ZnO, BeO, Al₂O₃
5. Tarkibning doimiylik qonunini kashf etgan olimni belgilang.
A) D.I.Mendeleyev B) J.Dalton C) J.Prust D) M.Lomonosov
6. Vodorod pereoksiddagi vodorodning massa ulushini hisoblang.
A) 4,6% B) 5,2% C) 6,7% D) 5,9%
7. Temir (II)-ortofosfat tuzining ekvivalentini aniqlang.
A) 45,23 B) 59,68 C) 49 D) 50,65
8. ……..3d⁵4S¹ Qaysi elementning elektron formulasi ekanligini aniqlang.
A) Cr B) Mn C) Fe D) Ca
9. Nisbiy atom massasi 79,9 bo’lgan tabiiy bromdagi ⁷⁹Br va ⁸¹Br izotoplarining foiz miqdorini hisoblab toping.
A) ⁷⁹Br- 45 % va ⁸¹Br-55 % B) ⁷⁹Br- 55 % va ⁸¹Br-45 %
C) ⁷⁹Br- 60 % va ⁸¹Br-40 % D) ⁷⁹Br- 40 % va ⁸¹Br- 60 %
10. H₃PO₄ da fosforning oksidlanish darajasi nechaga teng?
A) +1 B) +3 C) +2 D) +5
11. K₂Cr₂O₇ da xromning oksidlanish darajasi nechaga teng?
A) +6 B) +2 C) +4 D) +5 12. 370 g KMnO₄ ning parchalanishidan hosil bo’lgan gazning n.sh.dagi hajmini va miqdorini aniqlang.
A) 19,23 litr va 2,4 mol B) 26,23 litr va 1,17 mol
C) 23,67 litr va 2,4 mol D) 22,4 litr va 1,17 mol
13. Tarkibida 2,4 %- H, 39,1 % -S, 58,5 %-O bo’lgan moddaning formulasini aniqlang.
A) H₂S₂O₄ B) H₂S₂O₃ C) H₂SO₃ D) H₂SO₄
14. KMnO₄ da Mn ning oksidlanish darajasi nechaga teng?
A) +6 B) +2 C) +4 D) +5
15. Qutbli kovalent bog’lanishli moddani toping.
A) HCl B) O₂ C) KCl D) H₂
16. Qaysi elementda nisbiy elektromanfiylik qiymat katta?
A) C B) Si C) O D) F
17.Ion bog’lanishli moddani toping.
A) HCl B) SiO₂ C) KCl D) H₂O
18.Qutbsiz kovalent bog’lanishli moddani toping.
A) HCl B) O₂ C) KCl D) H₂O
19. X elementni aniqlang. X+ ¹₀n = ¹³⁹₅₄Xe + ⁹⁵₃₈Sr+2¹₀n
20. Valentlik tushunchasini fanga kiritgan olim kim?
21. Xrom (III) sulfat tarkibidagi kislorodning massa ulushini (%) aniqlang. 22. Osh tuzi kristal panjarasi - 23. Yadro zaryadi bir xil, lekin massasi har xil bo’lgan atomlar turi …………. deyiladi.
24. Davriy qonun va davriy sistema asoschisi.
25. K₂MnO₄ da Mn ning oksidlanish darajasi nechaga teng?