11-sinf Kimyo olimpiada №2

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1. Ra-226 izotopi α-yemirilishga uchraydi. Agar 1,13 g radiy-226 izotopi shunday parchalansa, qancha hajm (n.sh.da) gaz hosil bo‘ladi?

A) 56 ml

B) 112 ml

C) 28 ml

D) 224 ml

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2. Bor modeliga ko‘ra vodorod atomidagi elektronning energiyasi quyidagicha aniqlanadi: bu yerda n – 1,2,3, … va h.k. butun sonlar. Bor modeliga ko‘ra elektronni 1-orbitadan (n = 1) 2-orbitaga (n= 2) o‘tkazish uchun qancha energiya (eV) talab qilinadi?

A) 40.8

B) 10.2

C) 6.8

D) 13.6

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3. Mol nisbatlari 5:2 bo'lgan CD₄ va H₂O tarkibidagi neytronlar soni ayirmasi 8,5 ga teng bo'lsa, aralashmaning mol yig'indisini toping.

A) 1,75

B) 175

C) 0,175

D) 17,5

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4. 2A + B↔ C reaksiya muvozanat holatida boshlang‘ich moddalar konsentratsiyalari [A]=0,5 mol/l; [B]=0,2 mol/l ga teng bo‘lsa muvozanat holatidagi C moddaning konsentratsiyasini (mol/ l) toping (KM=1).

A) 0,25 mol/l

B) 0,05 mol/l

C) 0,125 mol/l

D) 0,5 mol/l

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5. Geksan molekulasida nechta sp³-gibrid orbitallar mavjud?

A) 25

B) 24

C) 26

D) 23

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6. Noma'lum to'yingan aldegidning 1 moli oksidlanishidan olingan karbon kislota massasi shu aldegidning 0,75 moli yonishidan hosil bo'lgan karbonat angidrid massasidan 1,1 marta kichik bo'lsa, aldegidni aniqlang.

A) metanal

B) propanal

C) butanal

D) etanal

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7. SO₂ + NO₂ = SO₃ + NO reaksiyada SO₂ va NO₂ ning dastlabki konsentratsiyasi 6 va 7 mol/litr bo‘lsa, SO₂ ning muvozanat konsentratsiyasini (mol/litr) hisoblang (Км=1).

A) 2,77

B) 3,27

C) 10,77

D) 8,73

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8. 5,2 g atsetilendan necha gramm akril kislota olish mumkin?

A) 14,4

B) 1,44

C) 144

D) 0,144

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9. Quyidagi birikmalardan ham kation, ham anion bo‘yicha gidrolizga uchraydiganlarini aniqlang. 1) natriy sulfat; 2) ammoniy atsetat; 3)litiy nitrat; 4) ammoniy karbonat; 5) kaliy xlorid.

A) 1, 2, 5;

B) 4, 5;

C) 1, 3, 5;

D) 2, 4.

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10. KClning 20^oC dagi eruvchanlik koeffitsiyenti 34 ga teng. 350 g suvda 70 g KCl eritildi. Shu eritmani to‘yintirish uchun yana necha gramm KCl qo‘shish kerak?

A) 39

B) 29

C) 59

D) 49

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11. HСl + О₂ = Сl₂ + Н₂О reaksiya hajmi 8 litr bo‘lgan idishda olib borildi. Kimyoviy muvozanat qaror topganda moddalar konsentratsiyalari [HCl]=0,7, [O₂]=0,6 va [Н₂О]=0,4 mol/l ni tashkil qildi. Boshlang’ich moddalar miqdorini (mol) aniqlang.

A) 12; 6,4;

B) 1,5; 0,8;

C) 0,8; 0,2;

D) 6,4; 1,6.

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12. Quyidagi reaksiyaning o‘ng tomonidagi moddalar koeffitsiyentlar yig‘indisi nechaga teng? As₂S₃ + HNO₃= H₃AsO₄ + SO₂ + NO₂ + H₂O

A) 23

B) 58

C) 49

D) 35

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13. 250 g 8,94% li KCl eritmasidan 3 A tok kuchi 9650 sekund davomida o‘tkazilganda hosil bo‘lgan eritmaning foiz konsentratsiyasini (%) toping.

A) 7%

B) 6%

C) 5,5%

D) 6,5%

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14. 2CO(g) + O₂(g) ↔ 2CO₂(g) ushbu reaksiya bo‘yicha kislorodning sarflanish tezligi 4 mol/litr∙min. 2 litrli idishda shu reaksiya olib borilganda, kislorodning konsentratsiyasi 7 mol/litrdan 2 mol/litrgacha kamaydi. Reaksiyaning sekundlardagi davomiyligini aniqlang.

A) 45

B) 60

C) 55

D) 75

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15. 100^oC dagi Ba(NO₃)₂ ning 336 g to‘yingan eritmasi 25 ^oC gacha sovitilsa, necha gramm tuz kristallanadi? S(25⁰C)=10,5; S(100⁰C) =34,4)

A) 59,25

B) 59

C) 59,75

D) 23,9

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16. N₂(g)+3H₂(g) ↔ 2NH₃(g) ushbu reaksiya bo‘yicha azotning sarflanish tezligi 3 mol/l∙min. 8 litrli idishda shu reaksiya o‘tkazilganda, azotning miqdori 104 moldan 8 molgacha kamaydi. Reaksiya necha minut davom etganligini aniqlang.

A) 4

B) 5

C) 6

D) 7

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17. 124,65 kPa bosim, temperatura 77 °C ga teng bo‘lganda, 7 l metan tarkibidagi atomlar sonini toping.

A) 1,2∙10²³

B) 3,02∙10²³

C) 6,02∙10²³

D) 9,03 ∙10²³

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18. Qaysi birikmalar suvda eritilganda ishqoriy muhit hosil qiladi? 1) natriy; 2) natriy nitrat; 3) kaliy peroksid; 4) litiy xlorid; 5) kaliy sulfat; 6) natriy gidrokarbonat.

A) 1, 3, 6

B) 2, 3, 6

C) 1, 4, 5

D) 2, 4, 5

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19. Alizaringa xrom (III) gidroksid qo'shilsa, qanday rang hosil bo'ladi?

A) oq

B) yashil

C) qora

D) zarg’aldoq

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20. Qaysi birikmalar suvda eritilganda kislotali muhit hosil bo‘ladi? 1) natriy peroksid; 2) alyuminiy nitrat; 3) magniy xlorid; 4) kaliy gidrid; 5) natriy gidrokarbonat; 6) rux sulfat.

A) 2 ,3

B) 2, 3, 6

C) 1, 4, 5

D) 1, 5

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21. 100 ^oC dagi KBr ning 408 g to‘yingan eritmasi 25^oC gacha sovitilsa, necha gramm tuz kristallanadi? (S (25 ^oC)=66; S (100 ^oC)=104)

A) 46

B) 66

C) 76

D) 56

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22. A+2B=C+D reaksiya bo‘yicha muvozanat qaror topgandan so‘ng moddalarning muvozanat konsentratsiyalari quyidagicha: [A]=0,4 mol/l, [B]=0,5 mol/l, [C]=0,25 mol/l, [D]=0,8 mol/l bo‘lsa, muvozanat konstantasini aniqlang.

A) 1

B) 3

C) 2

D) 4

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23. Qaysi birikmalar suvda eritilganda neytral muhit hosil bo‘ladi? 1) kaliy peroksid; 2) natriy nitrat; 3) kalsiy xlorid; 4) litiy sulfat; 5) natriy gidrokarbonat; 6) natriy gidrid.

A) 2,4,6.

B) 2, 3, 4;

C) 1, 3, 5;

D) 1, 5, 6;

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24. 500 g 32% li CuSO₄ eritmasidan misni to‘liq ajratib olish uchun 5 A to‘k kuchini necha sekund davomida o‘tkazish kerak?

A) 38600 sekund

B) 38000sekund

C) 38650 sekund

D) 38660 sekund

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25. Quyidagi tuzlarning qaysilari gidrolizga uchramaydi? 1) natriy sulfat; 2) ammoniy nitrit; 3) litiy nitrat; 4) alyuminiy karbonat; 5) kaliy xlorid; 6) ammoniy atsetat.

A) 1, 3, 5, 6;

B) 1, 3, 5;

C) 4, 5, 6;

D) 2,4,6;

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11-sinf Kimyo olimpiada №2

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