1-mavzu yuzasidan 2-darajali masalalar

A) natriy tellurid B) natriy sulfid C) natriy selenid D) natriy oksid
38. Etalon massa sifatida C12 izotopining 1/12 qismini o`rniga O16 ning 2/16 ismi olinadigan
bo`lsa, yangi etalon massa qiymati nechag teng bo`ladi?
A) 2,24∙10-24 B) 3,32∙10-24 C) 1,86∙10-24 D) 2,84∙10-24
39. Oddiy moddalarni tanlang.
1. muz 2. temir 3. Bo`r 4. Azot 5. Ozon 6. Fosfin 7. Karbin 8. Olmos 9. “quruq muz”
10. Bertole tuzi
A) 2,4,5,7,8 B) 1,2,4,5,8 C) 2,4,5,8,10 D) 1,3,5,7,9
40. Tarkibida 0,5 % chet moddalar bo`lgan dolomit mineralining kuydirilish natijasida 5 litr gaz
mahsulot olingan. Reaksiya uchun olingan dolomit massasini hisoblang.