I. a- oddiy va murakkab moddalar. Allatropiya. A birliklarni o’zgartiring

I.B – Kimyoviy formula bo’yicha hisoblashlar

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I.B – Kimyoviy formula bo’yicha hisoblashlar. Atom va molekulyar massa.
A) – Nisbiy atom massalarni toping. [ C = 12 ]
___ a) geliy atomining uglerod atomining massasiga nisbati 0,33.

___ b) uran atomining uglerod atomining massasiga nisbati 19,58.

___ c) yod atomining kislorod atomining massasiga nisbati 7,94.

___ d) kislorod atomining haqiqiy massasi

2,66 ∙10 ^-23 g bo’lsa

___ e) xlor molekulasining haqiqiy massasi

11,8 ∙10 ^-23g bo’lsa

___ f) temir atomining haqiqiy massasi

0,93∙10^-22g bo’lsa
B) – Quyidagi moddalarning nisbiy molekulyar massasini toping.
____ a) N₂O – azot(I)-oksid – kuldiruvchi gaz

____ b) H₂SO₄ – sulfat kislota

____ c) Al(OH)₃ – aluminiy gidroksid

____ d) Ca₃(PO₄)₂– kalsiy fosfat

____ e) CuSO₄∙ 5H₂O – mis kuporosi

____ f) Fe₄[Fe(CN)₆]₃ – berlin zangorisi

____ g) KAl(SO₄)₂∙ 12H₂O – acchiqtosh

____ h) C₅₅H₇₂MgN₄O₅ – xlorofill

C) – Quyidagi atom va molekulalarning haqiqiy massasini toping.
a) Al – e) H₂O –

b) Cu – f) CaCO₃ –

c) Ba – g) HNO₃ –

d) Xe – h) Na₂SO₄ –

D) – Test mashqlari.
1. Quyidagi ta’riflardan qaysi biri noto`g`ri?

I – Kimyoviy formula moddaning sifat va miqdor tarkibini kimyoviy belgi, indeks va koeffitsiyentlar yordamida ifodalanishi.

II – Koeffitsient kimyoviy formulalar yozganda ishlatiladi, lekin kimyoviy tenglamalar yozganda ishlatilmaydi.

III – Indeks kimyoviy formulalarda atomlar va atomlar guruhi sonini bildiradi.

IV – Absolyut atom massa – bu atomning uglerod birliklarida ifodalangan massasi.

A) I, II B) II, IV C) II, III D) Faqat IV

2. Berilliy atomining absolyut (haqiqiy) massasini aniqlang.

A) 9 B) 5,418٠10^-22

C) 1,5٠10^-23 D) 0,668٠10^-23

3. 32 ta temir atomining massasini (g) hisoblang.

A) 2,78 ∙10^-21B) 2,98 ∙10^-21

C) 4,82 ∙10^-23 D) 1,784 ∙10^-26

4. 2008 ta oltin atomining massasi qancha (kg) ?

A) 395576 B) 6,57٠10^-22

C) 657٠10^-23 D) 6,57٠10^-24
5. Qaysi moddaning molekulyar massasi eng kichik?

A) [Ca(OH)]₂SO₄ B) [Al(OH)₂]₃PO₄

C) Ca(HSO₄)₂D) Ba(OH)NO₃

6. Qaysi moddaning molekulyar massasi eng katta?

A) [Mg(OH)]₂SO₃ B) [Cr(OH)]₃(PO₄)₂

C) Fe(HCO₃)₂D) [Ba(OH)]₂SO₄
7. Bir dona suv molekulasining massasi qanday?

A) 18 a.m.b B) 2,99٠10^-23g

C) 6,02٠10²³gD) A,B
8. Vodorodning 1 ta molekulasining massasini (g) aniqlang.

A) 3,3٠10^-23 B) 0,33٠10^-23

C) 33٠10^-23D) 3,3٠10^-22
9. Nechta osh tuzi molekulasi 10^-10 g keladi?

A) 10,3٠10¹³ B) 0,13٠10¹²

C) 1,03٠10¹²D) 1,3٠10¹¹
10. Qaysi moddalarning haqiqiy molekulyar massasi 1,66 ∙10^-22 g keladi?

A) CaCO₃, NH₄H₂PO₄

B) Ca(HCO₃)₂, K₂CO₃

C) (NH₄)₂SiO₃, NaHSO₄

D) CaCO₃, KHCO₃
11. Kalsiy karbid - (CaC₂) dagi kalsiyning massa ulushini (%) toping.

A) 62,5 B) 71,1 C) 67,5 D) 75,5
12. Marganes(III) oksid va marganes(VI) oksiddagi marganesning massa ulushini hisoblang.

A) 57,8 va 50,5% B) 63,2 va 49,5%

C) 69,6 va 53,4% D) 34,9 va 47,3%
13. Mis pentagidrat sulfat – CuSO₄∙5H₂O dagi kristalizatsiya suvning massa ulushini hisoblang.

A) 75 B) 25 C) 64 D) 36

14. Ruda tarkibida Fe(CrO₂)₂ massa ulushi 84% va Fe₂O₃ (16%) bor. Massasi 400 kg temirtosh tarkibidagi temirning massasini (kg) toping.

A) 129 B) 234 C) 185 D) 248

15. “Azofoska” mineral o’g’iti tarkibida ammo-niy digidrofosfat – NH₄H₂PO₄ (massa ulushi – 82%), ammoniy gidrofosfat – (NH₄)₂HPO₄ (7%), kaliy nitrat – KNO₃ (4%) va tarkibida azot bo’l-magan aralashmalar kiradi. Azofoskadagi azot-ning massa ulushini va massasi 120 kg bo’lgan o’g’itdagi atomar azotning miqdorini aniqlang.

A) 8,4% va 1,56 mol

B) 12% va 1,03 mol

C) 14% va 1,89 mol

D) 9,5% va 2,04 mol
16. Tarkibida pirit – FeS₂ minerali bo’lgan massasi 50 g tog’ jinsi namunasidan massasi 11,2 g bo’lgan temir ajratib olingan. Namunadagi piritning massa ulushini aniqlang.

A) 22,4 B) 35,2 C) 42,9 D) 48

17. Massasi 500 g bo’lgan temir(II)oksid va temir(III)oksid aralashmasidan qancha massa temir olsa bo’ladi? Aralashmadagi FeO ning massa ulushi 20%, Fe₂O₃ niki 80%.

A) 286 B) 342 C) 295 D) 358

18. Ba’zi bir metall oksidini tarkibini Me₂O₃ eng oddiy formula bilan ifodalash mumkin. Massasi 60,8 g bo’lgan oksid namunasi tarkibida 41,6 g metall bor. Bu qaysi metall?

A) Al B) Fe C) Cr D) Ni

19. Ba’zi bir element oksidi EO₂ tarkibga ega. Bu elementning oksiddagi massa ulushi 46,67%. Bu qanday element?

A) S B) Se C) Ge D) Si

20. Element oksidi EO₃ tarkibga ega. Bu oksiddagi elementning massa ulushi 62,2%. Qanday element oksid hosil qilgan?

A) Se B) Te C) Cr D) S
21. Massasi 25,6 g bo’lgan element, massasi 6,4 g bo’lgan molekulyar kislorod bilan birikib, EO tarkibli oksid hosil qiladi. Bu qanday element?

A) Ca B) Mg C) Cu D) Zn

22. Oltingugurt oksididagi azot va kislorodning massa ulushi 37% va 63%. Bu oksidning eng oddiy formulasini aniqlang.

A) N₂O₃B) NO₂ C) N₂O₅ D) NO
23. Fosfor xloriddagi xlorning massa ulushi 85,13% Xloridning eng oddiy formulasini aniqlang.

A) PCl₃B) PCl₄ C) PCl₅ D) PCl₆

24. Kimyoviy birikma tarkibiga natriy, oltingugurt va kislorod kiradi. Na – 36,5; S – 25,4; kislorodniki – 38,1. Birikmaning eng oddiy formulasini aniqlang.

A) Na₂SO₄B) Na₂SO₃

C) Na₂S₂O₃D) Na₄S₂O₇
25. Ba’zi bir kislota tarkibida vodorod (massa ulushi 1,46%), xlor (51,83%) va kislorod bor. Shu kislotaning eng oddiy formulasini aniqlang.

A) HClO₂ B) HClO₃

C) HClO₄ D) HClO

26. Molibden oksidda molibden massasining atomar kislorod massasiga nisbati 3 ga teng. Oksidning eng oddiy formulasini aniqlang.

A) MoO B) MoO₂

C) MoO₃ D) Mo₂O₃
27. Fosfor va brom birikmasining massasi 86,2 g bo’lgan namunasi tarkibida massasi 6,2 g bo’lgan fosfor bo’ladi. Shu birikmaning eng oddiy formulasini aniqlang.

A) PBr₃ B) PBr₅ C) PBr₄ D) PBr₆

28. Azotning vodorodli birikmasining molyar massasi 30 g/mol ga teng. Birikmadagi azotning massa ulushi 93,3% bo’lsa, uing formulasini aniqlang.

A) NH₃ B) N₂H₄ C) N₂H₂ D) HN₃

29. Berilliyning uglerodli birikmasida berilliyning massa ulushi 60% ekanligi ma’lum bo’lsa, birikmaning oddiy formulasini aniqlang.

A) Be₂C₃ B) Be₃C₄

C) BeC₂ D) Be₂C
30. Kaliyning marganes va kislorod bilan hosil qilgan birikmasining eng oddiy formulasini aniqlang. Agar ularning massa ulushi yuqoridagi tartibga muvofiq 39,6; 27,9 va 32,5% ga teng.

A) K₂MnO₄B) KMnO₄

C) K₄Mn₂O₇ D) KMnO₃

31. Tuz tarkibi magniy, fosfor va kisloroddan iborat bo’lib, ularning massa ulushlari tegishlicha 21,62; 27,93 va 50,45%. Tuzning formulasini aniqlang.

A) MgPO₃ B) Mg₃(PO₄)₂

C) Mg₂P₂O₇D) Mg(PO₃)₂
32. Kalsiy gidrofosfat kristallogidratida (presipitat) CaHPO₄∙ nH₂O da 18% fosfor bor. Kristallgidrat tarkibidagi ‘n’ ning qiymati necha?

A) 1 B) 2 C) 5 D) 10

33. Natriy sulfat kristallogidratida Na₂SO₄∙xH₂O da suvning massa ulushi 0,559. “x” ning qiymati necha?

A) 5 B) 7 C) 10 D) 12

34. Giposulfit – Na₂S₂O₃∙xH₂O tarkibida vodorodning massa ulushi 4,032%. Kristallogidrat tarkibini aniqlang.

A) Na₂S₂O₃∙3H₂O B) Na₂S₂O₃∙5H₂O

C) Na₂S₂O₃∙7H₂O D) Na₂S₂O₃∙10H₂O
35. O’rta tuzning kristallgidratining tarkibi 14,29% Na, 9,94% S, 69,57% O va vodoroddan iborat. Undagi suv molekulasi sonini toping.

A) 5 B) 7 C) 10 D) 2

36. Nisbiy atom massaning o’lchov birligi qilib C¹² uglerod izotopi massasining 1/12 qismi emas, balki 1/4 qismi qabul qilindi deylik. U holda moddaning haqiqiy molekulyar massasi qanday o’zgaradi?

A) 4 marta ortadi B) o’zgarmaydi

C) 3 marta ortadi D) 3 marta kamayadi
37. Nisbiy atom massaning o’lchov birligi qilib C¹² uglerod izotopi massasining 1/12 qismi emas, balki 1/3 qismi qabul qilindi deylik. U holda moddaning nisbiy molekulyar massasi qanday o’zgaradi?

A) 4 marta ortadi B) 4 marta kamayadi

C) 3 marta ortadi D) o’zgarmaydi

Bilishini bilganga ergashing,

Bilishini bilmaganni ogohlantiring,

Bilmasligini bilganga o’rgating,

Bilmasligini bilmagandan qoching. (Konfutsiy)

Testlar - 1996-2003 yillar. (Axborotnoma).
1. (97-11-145). Molekulyar og’irliklari yig’indisi eng katta bo’lgan moddalar guruhini ko’rsating.

A) suv, metan, azot(IV) oksid

B) ammiak, azot(IV) oksid, suv

C) suv, ammiak, metan

D) metan, ammiak, azot(IV)oksid

E) azot(II)oksid, suv, azot(IV) oksid
2. (97-7-43). Qaysi moddalarda atom va molekulyar massalar bir xil emas?

1) vodorod 2) temir 3) kaliy

4) marganes 5) azot 6) ftor

A) 1, 5, 6 B) 2, 4, 6 C) 1, 3, 4

D) 3, 5, 6 E) 2, 3, 6

3. (98-5-2). Qaysi moddaning molekulyar massasi eng katta?

A) karbonat angidrid B) sulfat kislota C) ichimlik soda D) sirka kislota

E) malaxit
4. (03-7-16). "Temirning nisbiy atom massasi 56 ga teng" degan jumla sizga nimani anglatadi?

A) bitta temir atomining massasi 56 g ga tengligini

B) bir mol temir atomlarining massasi 56 g ga tengligini

C) bitta temir atomining massasi bitta ¹²C atomining massasidan 56 marta katta ekanligini

D) bitta temir atomining massasi bitta uglerod atomi massasining 1/12 qismidan 56 marta og’irligini

E) 6,02 ∙10²³ ta temir atomlarining massasi 56 g ga tengligini

5. (98-10-2). Qaysi elementga metallmaslik xos emas?

A) kislorod B) oltingugurt C) selen

D) poloniy E) tellur

6. (01-8-5). Qaysi moddaning molekulyar massasi eng katta qiymatga ega?

A) natriy tellurid – Na₂Te

B) natriy sulfid – Na₂S

C) natriy selenid – Na₂Se

D) natriy oksid – Na₂O

E) kaliy oksid – K₂O
7. (02-11-53). Anilinning (C₆H₅NH₂) bitta mole-kulasining massasi qanday ifodalanishi mumkin?

1) 93 m.a.b. 2) 93 g

3) 93 g/mol 4) 1,54·10^-22 g

A) 1, 3 B) 2, 4 C) 1, 4 D) 1 E) 3

8. (99-6-41). Quyidagi birikmalarda bir xil massadagi azotga kislorod massalarining nisbati qanday o’zgaradi?

N₂O, NO, N₂O₃, NO₂, N₂O₅

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

C) 1:1:3:2:5 D) 16:16:48:32:80

E) 5:4:3:2:1
9. (00-5-9). Agar molekulaning massasi 44 m.a.b. ga teng bo’lsa, uning 1 mol miqdordagi molekulalar massasini toping.

A) 73 B) 6,02 ∙10²³ C) 44

D) 3,67 E) 88
10. (99-10-2). Kimyoviy birikmani tashkil etuv-chi elementlarning massa ulushlari quyidagicha: H – 1,59%; N – 22,22%; O – 76,19%. Shu birikmaning formulasini aniqlang.

A) HNO₂ B) HNO₃ C) NH₄NO₂

D) NH₄OH E) NH₄NO₃
11. (99-6-7). Moddalardan qaysi birining nisbiy molekulyar massasi 73 ga teng?

A) 2-amino-2-metilpropan – CH₃C(CH₃)(NH₂)CH₃

B) 2-aminopropan – CH₃CH(NH₂)CH₃

C) trimetilamin – (CH₃)₃N

D) dimetilizopropilamin –(CH₃)₂NCH(CH₃)₂

E) 2-amino-2-metilbutan – CH₃C(CH₃)(NH₂)CH₂CH₃
12. (00-5-8). Massaning atom birligi qiymatini (g) ko’rsating.

A) 2∙10^-23 B) 1,66 ∙10^-24 C) 1

D) 1/12 E) 12
13. (00-5-15). Azotning 1 ta molekulasining massasi (g) qanchaga teng?

A) 28 B) 14 C) 4,65 ∙10^-23

D) 2,32 ∙10^-23 E) 9,3 ∙10^-23
14. (00-5-24). Natriy perxloratning beshta molekulasi massasini hisoblang.

A) 612,5 B) 122,5 C) 30 ∙10^-23

D) 1,02 ∙10^-21 E) 10,2 ∙10^-23
15. (01-6-39). Simob atomining absolyut massasi necha gramm?

A) 2,4 ∙10^-24B) 1,2 ∙10^-23 C) 1,5 ∙10^-22

D) 5,1 ∙10^-22 E) 3,3 ∙10^-22
16. (98-10-4). Modda molekulasining massasi 5,65 ∙10^-26 kg bo’lsa, uning nisbiy molekulyar massasini aniqlang. [m(C) = 2 ∙10^-26 kg].

A) 34 B) 36 C) 38 D) 32 E) 48

17. (97-10-97). Bittadan kaliy va temir metallari atomlarining massalarini (g) toping.

A) 6,48 ∙10²³ va 0,93 ∙10^-23

B) 6,5 ∙10^-24 va 9,3 ∙10^-24

C) 6,48 ∙10^-23 va 9,3 ∙10^-23

D) 39 va 55,8

E) 3,9 ∙10^-23 va 5,6 ∙10^-23
18. (99-10-5). Uglerodning bitta atomi massasi necha grammni tashkil etadi?

A) 3,01∙10^-22B) 2∙10^-22C) 0,2 ∙10^-23

D) 3,01∙10^-23E) 2∙10^-23
19. (99-10-6). Kislorodning 1 ta molekulasi massasini (g) aniqlang.

A) 5,3 ∙10^-23B) 0,53 ∙10^-23C) 32 ∙10^-23

D) 3,2 ∙10^-22E) 5,3 ∙10^-22

20. (98-2-38). Agar 2,22 g suvsiz kalsiy xlorid 4,38g kristallgidrat hosil qilsa, tuz tarkibida necha molekula suv bo’ladi?

A) 4 B) 2 C) 3 D) 6 E) 1

21. (00-1-46). Natriy gidrofosfat Na₂HPO₄∙ nH₂O da 11,57% fosfor bor. Kristallgidrat tarkibidagi ‘n’ ning qiymati necha?

A) 1 B) 7 C) 5 D) 10 E) 12

22. (01-3-38). Glauber tuzi deb ataladigan tuz Na₂SO₄∙ nH₂O tarkibida natriyning massa ulushi 16,08% ga teng. Bu tuz tarkibida necha mol suv bor?

A) 6 B) 8 C) 10 D) 12 E) 14

23. (01-3-39). Magniy kuporosi MgSO₄∙nH₂O tarkibida magniyning massa ulushi 11,42% ga teng. “n” ning qiymatini toping.

A) 4 B) 5 C) 6 D) 7 E) 8

24. (01-3-40). Na₂CO₃∙ nH₂O tarkibida uglerodning massa ulushi 4,8% ga teng bo’lsa, “n” ning qiymati qancha bo’ladi?

A) 7 B) 8 C) 9 D) 10 E) 12

25. (01-3-41). Temir(III) sulfat Fe₂(SO₄)₃∙ nH₂O tarkibida oltingugurt bilan temirning massa ulushi 37,0% ga teng bo’lsa, “n” ning qiymati qancha bo’ladi?

A) 8 B) 10 C) 12 D) 6 E) 9

26. (01-3-42). Alyuminiy sulfat kristallgidrati Al₂(SO₄)₃∙ nH₂O tarkibida alyuminiyning massa ulushi 9,67% ga teng bo’lsa, “n” ning qiymati qancha bo’ladi?

A) 10 B) 12 C) 14 D) 16 E) 18

27. (01-3-43). Alyuminiy nitrat kristallgidrati Al(NO₃)₃∙ nH₂O tarkibida azotning massa ulushi 0,1239 ga teng bo’lsa, “n” ning qiymati qancha bo’ladi?

A) 6 B) 7 C) 8 D) 9 E) 10

28. (01-3-44). Bura (tanakor) deb ataluvchi Na₂B₄O₇∙ nH₂O tarkibida borning massa ulushi 0,16 ga teng bo’lsa, “n” ning qiymati qancha bo’ladi?

A) 2 B) 4 C) 6 D) 8 E) 5

29. (03-2-51). Marganes(II) sulfat kristallgidrati tarkibida 24,66% marganes bo’lsa, uning formulasi qanday bo’ladi?

A) MnSO₄∙H₂O B) MnSO₄∙3H₂O

C) MnSO₄∙4H₂O D) MnSO₄∙5H₂O

E) MnSO₄∙2H₂O

30. (00-10-15). Na₂CO₃∙ xH₂O kristallogidrat-dagi suvning massa ulushi 62,94% ni tashkil etadi. “x” ni aniqlang.

A) 12 B) 7 C) 5 D) 10 E) 2

31. (02-5-8). MgSO₄ ning taxir tuz deb nomlanuvchi kristallgidrati tarkibida 51,22% suv bo’ladi. Shu kristallgidrat MgSO₄∙nH₂O da “n” ni toping.

A) 2 B) 3 C) 4 D) 7 E) 10

32. (02-6-23). Alyuminiy sulfat kristallgidrati tarkibidagi alyuminiyning massa ulushi 8,1% ga teng bo’lsa, kristallgidrat tarkibidagi suvning mollar sonini aniqlang.

A) 6 B) 9 C) 12 D) 16 E) 18

33. (02-6-25). Tabobatda taxir tuz deb nomlangan modda tarkibida 51,22% suv bo’lsa, uning formulasini toping.

A) MgCl₂∙6H₂O B) MgSO₄∙7H₂O

C) MgSO₄∙6H₂O D) MgSO₄∙2H₂O

E) MgCl₂∙4H₂O

34. (98-8-90). 30 g kalsiy sulfat kristallgidrati qizdirilganda 6,28 g suv ajralib chiqdi. Kristallgidrat formulasini aniqlang.

A) CaSO₃∙3H₂O B) CaSO₄∙H₂O

C) 2CaSO₃∙H₂O D) CaSO₄∙2H₂O

E) CaSO₃∙5H₂O

35. (99-10-14). Magniy gidroksiddagi Mg(OH)₂ magniy, kislorod va vodorodlarning massalari nisbatini ko’rsating.

A) 6:10:1 B) 6:8:1 C) 12:16:8

D) 12:16:1 E) 3:4:0,5

36. (99-10-28). Uglerod bilan kislorod qanday og’irlik nisbatida birikma hosil qilishi mumkin?

A) 1:1,5 va 1:3 B) 1,5:2 va 3:4

C) 1,5:2 va 1,5:4 D) 3:4 va 1:2

E) 1:1,33 va 1:2,67

37. (96-1-3). Nitrat kislotasi tarkibidagi azotning massa ulushi nimaga teng?

A) 0,11 B) 0,18 C) 0,22

D) 0,30 E) 0,35

38. (96-1-12). Quyidagi birikmalarning qaysi birida uglerodning massa ulushi uning atomining massasiga teng?

A) H₂CO₃ B) CO C) CaCO₃

D) Ca(CH₃COO)₂E) CO(NH₂)₂
39. (96-15-5). Tarkibida azotning massa ulushi 63,63%, kislorodniki esa 36,37% bo’lgan azot oksidining formulasini ko’rsating.

1) N₂O 2) N₂O₃ 3) N₂O₅4) NO 5) NO₂

A) 3 B) 4 C) 2 D) 5 E) 1
40. (97-11-191). G’o’za bargini to’kish uchun ishlatiladigan kalsiy sianamid tarkibida 50% kalsiy, 15% uglerod va 35% azot borligi ma’lum. Birikmaning formulasini aniqlang.

A) CaCN₂B) Ca₂CN C) Ca(CN)₂

D) Ca₃(CN)₂E) Ca₂(CN)₃

41. (96-5-5). Tarkibida marganesning massa ulushi 49%, kislorodniki 51% bo’lgan oksid formulasini ko’rsating. Ar(Mn)=54

A) Mn₂O₃ B) MnO₂C) MnO

D) MnO₃ E) Mn₂O₇
42. (96-3-4). Alyuminiy xloridda qancha element bo’lsa qaysi birikmada shuncha element bor?

A) H₂SO₄ B) H₂S C) O₃

D) Cl₂ E) HClO₂

43. (96-1-5). Fosforning ftorli birikmasi tarkibidagi ftorning massa ulushi 0,65 bo’lsa, modda formulasini toping. Ar(F) = 19.

A) PF₅ B) PF₃ C) H[PF₆]

D) H[PF₄] E) P₂F₈
44. (97-11-188). Jez qotishmasida 60% mis va 40% rux bor. Shu birikmaning formulasini aniqlang. [Cu = 64, Ar(Zn) = 65]

A) CuZn B) Cu₂Zn C) Cu₂Zn₂

D) Cu₃Zn₂ E) Cu₃Zn₃

45. (97-11-189). Qalay va misning qotishmasida har bir atom qalayga 5 atom mis to’g’ri kelishi uchun shu qotishmada necha foiz qalay bo’lishi kerak?

A) 27,0 B) 30,0 C) 25,5 D) 28 E) 31
46. (97-11-190). 224 kg xromli temirtosh FeCr₂O₄ rudasidan necha kilogramm xrom ajratib olish mumkin?

A) 52 B) 104 C) 100 D) 90 E) 110

47. (97-3-40). 160 g massali oltingugurtda necha mol oltingugurt atomi bor? [Ag(S) = 32]

A) 4 B) 5 C) 5,5 D) 4,5 E) 6,0

48. (02-1-1). Temir ma’dani tarkibida 34% Fe₂O₃ bo’lsa, uning 100 kg massasida temir moddasining miqdori qancha bo’ladi?

A) 4,25٠10² B) 4,25٠10^-2C) 3,8٠10^-2

D) 4,25 E) 4,0٠10²

49. (01-8-4). Molekulasi beshta atomga ega bo’lgan moddalarni toping.

1) perxlorat kislota - HClO₄

2) natriy xlorat - NaClO₃

3) alyuminiy xlorid - AlCl₃

4) kalsiy perxlorat - Ca(ClO₄)₂

5) magniy gipoxlorit - Mg(ClO)₂

6) xlorit kislota - HClO₂

A) 1,5 B) 2,4 C) 3,4 D) 2,5 E) 3,6

51. (02-6-20). Glyukozadagi uglerod, vodorod va kislorodning massa nisbatlari qanday bo’ladi?

A) 1:2:1 B) 6:12:6 C) 3:4:3

D) 2:6:2 E) 6:1:8
52. (97-12-71). Oqsil molekulasi tarkibida 4 ta oltingugurt atomi bo’lib, u molekulaning 2,5% ini tashkil etadi. Oqsilning nisbiy molekulyar massasini hisoblang.

A) 520 B) 1226 C) 2560

D) 3560 E) 5120
53. (02-6-17). Molekulasining massasi 3,32∙10^-19gramm bo’lgan oqsilning nisbiy molekulyar massasini ko’rsating.

A) 18000 B) 20000 C) 200000

D) 180000 E) 16666
54. (02-6-18). Protein molekulasi tarkibida 2 atom temir bo’lib, uning massa ulushi 0,28% ga teng. Proteinning nisbiy molekulyar massasini hisoblang.

A) 28000 B) 11200 C) 56000

D) 40000 E) 36000

55. (98-9-54). Massasi 15 g bo’lgan modda yonganda, 2,8 g azot, 17,6 g uglerod(IV) oksid va 9 g suv hosil bo’ldi. Boshlang’ich modda tarkibi qaysi element atomlaridan tashkil topgan?

1) azot 2) vodorod

3) kislorod 4) uglerod

A) 1, 2, 3 B) 1, 3, 4 C) 2, 3, 4

D) 1, 2, 4 E) 1, 2, 3, 4

56. (99-10-13). 3,4 g noma’lum modda yonishidan 2,8 g azot va 5,4 g suv hosil bo’ldi. Uning nomini aniqlang.

A) gidrazin (N₂H₄)

B) ammoniy nitrit (NH₄NO₂)

C) ammiak (NH₃)

D) ammoniy gidroksid (NH₄OH)

E) nitrit kislota (HNO₂)

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