K imyo Ergashev Botirjon

A) MgCO₃ B) Na₂CO₃ C) CuCO₃ D) K₂CO₃

2. Qaysi tuz eritmasi inert elektrodlar yordamida elektroliz qilinganda katodda vodorod, anodda kislorod ajralib

chiqadi?
A)KCl B)CuCl2 C)AgNO3 D)NaNO3

3. CuSO₄ eritmasiga 10 gr Fe tushirildi, bir ozdan so’ng plastinka massasi 11gr gat eng bo’ldi. Bunda qancha gr Fe eritmga o’tgan?

A) 6 B) 7 C) 6,5 D) 7,5

4. 1:2 mol nisbatda olingan ozon va kislorod aralashmasining massa nisbatini aniqlang.

A) 5:3 B) 3:4 C) 1:2 D) 1:1

5. Uglerod tabiatda erkin holda qanday ko‘rinishda uchraydi?

A) karb orund va karbin
B) olmos va grafit
C) kalsit va fulleren
D) billur va fulleren

6. pH=5 bo’lgan eritmadagi OH^- ionining konsentratsiyasini (mol/l) hisoblang.

A) 10^-5 B) 10^-9 C) 5 D) 9

7. Titri 40 mg/ml bo’lgan temir (III) sulfat eritmasining molyar konsentratsiyasi(mol/l)ni aniqlang.

A) 0,1 B) 0,3 C) 0,15 D) 0,05

8. Butlerov izomerlanish reaksiyasida qaysi moddani katalizator sifatida ishlatgan?

A) AlCl₃ B) Na C) Ca(OH)₂ D) Pd,Pt,Ni

9. Qaysi reaksiya(lar) amalda bormaydi?

1) ZnSO₄ + Fe→
2) ZnMnO₄ + Cu→
3) Zn(NO₃)₂ + Mg →
4) ZnCl₂ + Co →
A) 1,3 B) 4 C) 1,2,4 D) 3

10. Quyidagi oksidlanish-qaytarilish reaksi-yasida jami koeffisentlar yig’indisini aniq-lang. KMnO₄ + KOH + Na₂SO₃ = K₂MnO₄ + Na₂SO₄ + H₂O

A) 9 B) 8 C) 10 D) 6

11. Na₂O₂ molekulasidagi natriy va kislorod-ning oksidlanish darajasini toping.

A) -2; +2 B) +2; -1 C) +1; -1 D) +1; -2

12. Qaysi metallmas gidridining 127^oC va 83,1 kPa bosimda 6 litrida 3,612·10²³ ta atom bo’ladi? (R=8,31)

A) uglerod B) fosfor C) kremniy D) oltingugurt
13. Xlor atomidagi 17- elektron uchun kvant sonlar qiymatini ko’rsating.
A) n=3; l=2, m_l=+2 m_s=+ 0,5
B) n=3; l=1; m_l=+1 m_s=+ 0,5
C) n=3; l=1; m_l=0 m_s= -0,5
D) n=3; l=1; m_l=+1 m_s= -0,5

14. Qaysi metalldan yasalgan plastinka mis sulfat eritmasiga tushirilganda plastinkaning massasi kamayadi?

A) temir B) rux C) magniy D) alyuminiy

15. 26 g H2SO4∙0,4SO3 tarkibli oleumdan necha gramm sulfat kislota olish mumkin?

A) 20,2 B) 15 C) 18,4 *D) 19,6 g

16. Qaysi qatorlarda faqat kuchli elektrolitlar keltirilgan?

1) CH₃COOH, NH₄OH, HNO₂;
2) Na₂SO₄, AlCl₃, H₂SO₄;
3) Al(OH)₃, NH₄OH, NaOH;
4) NaCl, HF, Zn(OH)₂;
5) H₂SO₃, NH₄OH, H₂CO₃;
6) CaCl₂, HNO₃, CuSO₄.
A) 1, 3, 5 B) 1, 5 C) 2, 4, 6 *D) 2, 6

17. Xrom(III)sulfatning dissotsiatsiyalanma-

gan molekulalari tarkibidagi atomlar soni dissotsiatsiyalangan molekulalardan hosil bo’lgan ionlar soniga teng bo’lsa, xrom (III) sulfatning dissotsiatsiyalanish darajasini (α%) aniqlang.
A) 94,4 B) 77 C) 89 D) 85

18. Gidrolizga uchraydigan tuzlar qatorini ko'rsating.

A) KCl, Ca(NO₃)₂, Na₂S, MgSO₄
B) CaCl₂, Ba(NO₂)₂, K₃PO₄, CuS
C) NH₄NO₃, Na₂SiO₃, K₂SO₄, MgCl₂
*D) NH₄Cl, CH₃COONa, K₂SiO₃, FeCl₃

19. Birinchi elektrolizerda 2 mol, ikkinchisida 3 mol mis(II) sulfat bo'lgan eritmalar orqali 5 faradey tok o'tganda katodlarda (inert elektrod) ajralib chiqqan moddalar massalarini (g) hisoblang.