Fanining stexiometrik qonunlari

3-Mavzu: Qaychi usulda foiz konsentratsiyani topish. (Aralashtrish qoidasi).

1. 500 kg 40% li NaOH eritmasini tayyorlash uchun 50% li va 30% li eritmalardan qanchadan (kg) olish kerak?

A) 125:375 B) 375:125 C) 225:275 D) 250:250

2. 70% li va 30% li tuz eritmalaridan 40% li eritma tayyorlash uchun ularni qanday massa nisbatlarda aralashtirish kerak?

A) 35:8 B) 8:35 C) 10:25 D) 10:30

3. 20% li sulfat kislota eritmasidan 150 g tayyorlash uchun 60% li va 10% li eritmalaridan necha grammdan olish kerak?

A) 40:110 B) 45:105 C) 35:115 D) 30:120

4. 26% ishqor eritmasini hosil qilish uchun uning 30% li 100 g eritmasiga 10% li eritmasidan qanday miqdorda qo’shish kerak?

A) 25 B) 50 C) 100 D) 10

5. Massa ulushi 0,65 bo’lgan 700 g sirka kislota eritmasini tayyorlash uchun sirka angidrid va 20 % li sirka kislota eritmasidan qanday miqdorda (g) olish mumkin?

A) 85,55 va 185,55 B) 322,74 va 377,26

C) 320 va 380 D) 85,55 va 377,26

6. 98% li H₂SO_­4 eritmasidan 1200 g tayyorlash uchun sulfat angidrid va 32% li sulfat kislota eritmasidan qanday miqdorda (g) olish zarur?

A) 269,39:369,39 B) 875,14:324,86

C) 245,66:355,66 D) 160,50:940,50

7. 56% li sulfit kislota eritmasidan 650 g tayyorlash

uchun sulfit angidrid va 14% li sulfit kislota

eritmasidan qancha miqdorda (g) kerak?

A) 58,33:158,33 B) 410,59:238,47

C) 239,2:410,8 D) 310,59:239,47

8. O’yuvchi natriyning 60% li eritmasidan 600 g tayyorlash uchun uning 10% li eritmasidan va natriy oksididan qancha miqdordan (g) olish zarur?

A) 72,46:172,46 B) 347,9:72,46

C) 252,09:347,9 D) 347,9:252,09

9. O’yuvchi kaliyning 66% li eritmasidan 750 g tayyorlash uchun uning 18% li eritmasidan va kaliy oksididan qancha miqdorda (g) olish zarur?

A) 349,5:300,49 B) 400,49:349,5

C) 187,27:200,4 D) 394,4:356

10. Mis (II) atsetatning 20% li eritmasidan 430 g tayyorlash uchun mis (II) atsetat kristallgidrati Cu(CH₃COO)₂•H₂O va 5% li mis (II) atsetat eritmasidan qanday miqdorda (g) olish kerakligini hisoblang.

A) 85:245 B) 75:355 C) 95;455 D) 65:455

11. 6,84% li mis (II) xlorid eritmasidan 1000 g tayyorlash uchun mis (II) xlorid kristallgidrati CuCl₂•2H₂O va 2% li eritmasidan qancha miqdorda (g) olinishi zarurligini toping.

A) 28,64:704,41 B) 38,6:805

C) 48,6:940 D) 63:937

12. 8,4% li MgCl₂ eritmasidan 800 g tayyorlash uchun magniy xlorid kristallgidrati MgCl₂•6H₂O va 4,2% li eritmasidan qanday miqdorda (g) olinishi zarur?

A) 600:200 B) 721,12:78,88

C) 740:60 D) 400:400

13. 16% li mis (II) sulfat eritmasidan 600 g tayyorlash uchun mis kuporosi CuSO₄•5H₂O va 6% li mis (II) sulfat eritmasidan qanday miqdorda (g) olinishi zarur?

A) 200:400 B) 300:300

C) 496,5:103,5 D) 180,5:419,5

14. 24% li bariy nitrat eritmasidan 300 g tayyorlash uchun uning 7% li eritmasidan va Ba(NO₃)₂•H₂O dan qanday miqdorda (g) olinishi zarur?

A) 321:69 B) 241:59 C) 211:89 D) 200:100

15. Osh tuzining 20% li eritmasidan 600 g tayyorlash uchun uning 10% li va 40% li eritmalaridan necha grammdan olish kerak?

A) 400:200 B) 300:300

C) 200:400 D) 150:450

16. Osh tuzining 20% li eritmasidan 800 g tayyorlash uchun uning 5% li va 30% li eritmalaridan necha grammdan olish kerak?

A) 320:480 B) 480:320

C) 380:420 D) 400:400

17. Osh tuzining 10% li eritmasidan 600 g tayyorlash uchun uning 4% li va 25% li eritmalaridan necha grammdan olish kerak?

A) 171,4:428,6 B) 428,6:171,4

C) 328,6;271,4 D) 428,4:171,6

18. Osh tuzining 20% li eritmasidan 300 g tayyorlash uchun uning 8% li va 40% li eritmalaridan necha grammdan olish kerak?

A) 187,5:112,5 B) 112,5:187,5

C) 120:180 D) 150:150

19. 16% li 200 g mis (II) sulfat eritmasini tayyorlash uchun mis kuporosi va suvdan necha grammdan olish kerak?

A) 50:150 B) 100:100 C) 25:175 D) 150:50

20. 8% li 600 g mis (II) sulfat eritmasini tayyorlash uchun mis kuporosi va suvdan necha grammdan olish kerak?

A) 50:550 B) 75:525 C) 525:75 D) 400:200

21. 16% li 400 g temir (III) sulfat eritmasini tayyorlash uchun temir kuporosi (Fe₂(SO₄)₃•12H₂O) va suvdan necha grammdan olish kerak?

A) 98,6:301,4 B) 301,4:98,6

C) 110,4:289,6 D) 50:350

22. 20% li 300 g rux sulfat eritmasini tayyorlash uchun rux kuporosi (ZnSO₄•6H₂O) va suvdan necha grammdan olish kerak?

A) 200:100 B) 100:200 C) 150:150 D) 25:275

23. 20% li KOH eritmasini hosil qilish uchun, tarkibida 44 g KOH tutgan 453 g eritmada qancha (g) kaliy oksidni eritish kerak?

A) 47 B) 48 C) 45 D) 51

24. Sulfat kislotaning 20% li eritmasini hosil qilish uchun 500 g suvda necha gramm oltingugurt (VI) oksidni eritish kerak?

A) 78,25 B) 85,48 C) 97,56 D) 100

25. 100 g 15% li NaCl eritmasida necha gramm osh tuzi eritilganda, eritma konsentratsiyasi 20% bo’ladi?

A) 4,25 B) 5,25 C) 6,25 D) 7,25