I – kimyodan asosiy tushunchalar


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Variantlar – 2003 yil.

1. 6,02∙1022 ta suv molekulasining massasini va 1,505∙1024 ta suv molekulasi miqdorini aniqlang


A) 36; 0,01 B) 1,8; 2,5 C) 40; 1,0 D) 45; 0,1 E) 0,45; 10

2. Necha ml etil spirt C2H5OH (p = 0,78 g/ml)


2 mol suvga qo’shilganda hosil bo’lgan eritmada spirt molekulalarining soni suvnikidan ikki marta ko’p bo’ladi?
A) 39 B) 236 C) 59 D) 55 E) 246

3. 0,03 g suv tarkibidagi atomlar sonini toping.


A) 3 ∙1021 B) 1∙1021 C) 1,8 ∙1020
D) 1,5 ∙1022 E) 6,02 ∙1019

4. Chala kuydirib olingan gips (alebastr) – CaSO4 ∙ ½H2O ning 580 g massasidagi suvning modda miqdorini toping.


A) 0,50 B) 3,75 C) 4,0 D) 2,5 E) 2,0

5. Hajmi 0,75 l bo’lgan suvning mollar sonini hisoblang.


A) 41,7 B) 22,4 C) 13,9 D) 18 E) 9,0

6. Tabiiy suv tarkibidagi og’ir suvning miqdori 0,02% ni tashkil etsa, 500 g suvdagi og’ir suv molekulalari sonini hisoblang.


A) 6 ∙1021 B) 3 ∙1022 C) 6 ∙1022
D) 4,03 ∙1021 E) 3 ∙1021
Variantlar – 2004 yil.

1. (105-17). Temir ma’dani tarkibida 44% Fe2O3 bo’lsa, uning 1 kg massasida temir moddasining miqdori qancha bo’ladi?


A) 5,25 ∙10-2 B) 5,5 C) 4,25∙102
D) 4,25 E) 5,5∙10-2

2. (108-18). Massasi 9,8 g bo’lgan ortofosfat kislota - H3PO4 tarkibidagi vodorod atomlari soni qancha bo’ladi?


A) 18∙1023 B) 1,8∙1024 C) 1,8∙1023
D) 2,4∙1024 E) 24∙1022
3. (110-17). Bir yarim mol miqdordagi ammiak tarkibidagi vodorod atomlari sonini hisoblang.
A) 2,7 ∙1024 B) 4,5 ∙1023 C) 9,03 ∙1023
D) 27 ∙1022 E) 5,6 ∙1023

4. (110-18). Ortofosfat kislotaning 70 ml 65%li (p = 1,47 g/ml) suvli eritmasidagi vodorod atomlari sonini hisoblang.


A) 1,2 ∙1024 B) 5,2 ∙1024 C) 1,4 ∙1024
D) 3,6 ∙1024 E) 2,3 ∙1024

5. (115-17). 750 mg vodorod gazidagi atomlar soniga teng atomlarga ega bo’lishi uchun necha gramm temir kerak?


A) 56 B) 26 C) 14 D) 42 E) 28

6. (115-18). Dengiz suvining bir tomchisida 50 milliardga yaqin oltin atomlari bor. Dengiz suvidan 16 tomchisining massasini 1 g deb olib, dengiz suvining 100 tonnasidagi oltinning massasini (g) hisoblab toping.


A) 0,03 B) 0,15 C) 3 ∙10-5
D) 0,0003 E) 0,05

7. (116-17). Tarkibida 6,02 ∙1021 dona vodorod atomi bo’lgan Be(OH)2 massasi qancha?


A) 0,32 B) 0,21 C) 0,86 D) 0,43 E) 1,92

8. (117-17). Tarkibida vodorod atomlari soni


1,2 ∙1022 ta bo’lgan ammoniy dixromat (NH4)2Cr2O7 necha gramm massaga ega bo’ladi?
A) 0,63 B) 0,48 C) 1,26 D) 0,28 E) 1,52

9. (119-17). Galaktozaning – C6H12O6 20% li suvli eritmasidagi erigan modda bilan erituvchi molekulalari orasidagi nisbatni toping.


A) 1: 45 B) 1: 40 C) 2 : 95
D) 2 : 45 E) 1: 80

10. (120-17). Necha gramm neondagi molekulalar soni 4,5 gramm suvdagi molekulalar soniga teng bo’ladi?


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

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