9-sinf Kimyo olimpiada №4 Yanvar 5, 2023Yanvar 5, 2023 da chop etilgan InfoMaster tomonidan 9-sinf Kimyo olimpiada №4 ga 1 fikr bildirilgan 0 12345678910111213141516171819202122232425 Vaqtingiz tugadi! 9-sinf Kimyo olimpiada №4 03.01.2023 yil oo.uzedu.uz Online olimpiada savollari! 1 / 25 2SO2 + O2 = 2SO3 reaksiya uchun vanadiy(V) oksidi geterogen katalizator hisoblanadi. Katalizator ishtirokidagi reaksiyalar 2 bosqichda amalga oshadi: 1-bosqich: .... 2-bosqich: 4VO2 + O2 = 2V2O5 Katalizatorga xos umumiy xususiyatlardan kelib chiqib 1-bosqich reaksiya tenglamasini keltiring. II I IV III 2 / 25 Eritmaga suv qo’shilganda eritma massasi 3 marta ortdi. Konsentratsiyasi esa 8% ga kamaydi. Olingan eritmadagi tuz konsentratsiyasini (%) da aniqlang? 12 24 4 8 3 / 25 120 g 20% li NaOH eritmasiga 480 g 10%li NaOH eritmasi qo’shildi. Bunda 6M li eritma hosil bo’ldi. Hosil bo’lgan eritmaning zichligini (g/ml) toping. 1.6 2 1.3 1.5 4 / 25 Quyidagi oksidlardan qaysi birining suv bilan reaksiyasidan kislota hosil bo`ladi? CO₂ CaO N₂O CO 5 / 25 200 ml 0,2 M KOH eritmasiga 300 ml 0,15 M HCl eritmasi qo`shildi. Hosil bo`lgan eritmaning pH qiymatini aniqlang. Eritmalar aralashtirilganda eritmalar hajmi qo`shiladi deb hisoblang. 4 1 2 3 6 / 25 D C A B 7 / 25 D A C B 8 / 25 D B A C 9 / 25 B D C A 10 / 25 C A B D 11 / 25 D B C A 12 / 25 C A B D 13 / 25 C B D A 14 / 25 D B A C 15 / 25 C B D A 16 / 25 A C B D 17 / 25 D A B C 18 / 25 D C B A 19 / 25 C A D B 20 / 25 B A D C 21 / 25 B A D C 22 / 25 A B C D 23 / 25 B A D C 24 / 25 A B C D 25 / 25 D C B A 0% Author: InfoMaster Kimyo olimpiada
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