Uy » Online olimpiada » Kimyo olimpiada » 9-sinf Kimyo olimpiada №4 Kimyo olimpiada 9-sinf Kimyo olimpiada №4 InfoMaster Yanvar 5, 2023 664 Ko'rishlar 1 izoh SaqlashSaqlanganOlib tashlandi 2 0 12345678910111213141516171819202122232425 Vaqtingiz tugadi! 9-sinf Kimyo olimpiada №4 03.01.2023 yil oo.uzedu.uz Online olimpiada savollari! 1 / 25 CrO42- + xH2O + ye- → [Cr(OH)6]3- + zOH- yarim-reaksiyadagi x, y, z koeffisientlarni aniqlang. (uchala koeffisient to‘g‘ri bo‘lgandagina javob inobatga olinadi). x = 4, y = 2, z = 3 x = 3, y = 4, z = 2 x = 2, y = 3, z = 4 x = 4, y = 3, z = 2 2 / 25 Biror bir tuzning 70°C dagi eruvchanlik koeffitsiyenti uning 50°C dagi eruvchanlik koefsiyentidan 1,5 barobar ko’p. Agar shu tuzning 70°C dagi to’yingan 290 g eritmasi 50°C ga qadar sovitilganda 30 g tuz cho’kmaga tushishi ma’lum bo’lsa, shu tuzning 70°C dagi eruvchanlik koeffitsiyentini aniqlang. 20 60 30 45 3 / 25 xMn+n ioni 54Cr+3 ioniga ham izoton, ham izoelektron bo’lsa, x va n ning qiymatini aniqlang. 54; 3 54; 4 55; 3 55; 4 4 / 25 Pirobelonit PbMn₂VO₄OH mineralida vanadiyning oksidlanish darajasi: +1 +2 +3 +5 5 / 25 N₂(g) + ₃H₂(g) →₂NH₃ (g) ushbu jarayonda 11,2 dm³ (n.sh.) azot va 1,0 gr vodorod ishlatildi va bunda 0,25 mol ammiak ajratib olindi. Reaksiya unumini aniqlang. 75% 33% 25% 50% 6 / 25 D B A C 7 / 25 D C A B 8 / 25 B C D A 9 / 25 B C D A 10 / 25 C D A B 11 / 25 B D A C 12 / 25 A D B C 13 / 25 A D C B 14 / 25 D A C B 15 / 25 A C D B 16 / 25 B A D C 17 / 25 B A D C 18 / 25 D B A C 19 / 25 B A D C 20 / 25 D B A C 21 / 25 C D B A 22 / 25 D A C B 23 / 25 D C A B 24 / 25 C A B D 25 / 25 D B A C 0% Author: InfoMaster Foydali bo'lsa mamnunmiz
