Gr nomalum modda yonganda 44 gr co

1. 0.32 gr nomalum modda yonganda 0.44 gr CO₂ va 0.36 gr H₂O hosil bo’ldi. Nomalum moddani formulasini aniqlang .

A) C₂H₅OH B) CH₃OH C) CH₃COOH D) HCHO

2. Davriy sistemaning V-guruh elementining yuqori oksidi tarkibida E-43.66% bo’lsa, elementni toping.

A) N₂ B) P C) V D) As

3. Quyida keltirilgan molekulalarni ularning tarkibidagi neytronlar soni ortib borishi tartibida joylashtiring.

1) suv; 2) deyterometan; 3) ammiyak; 4) metan; 5) o'ta og'ir suv (T₂O).

A) 4, 3, 1, 2, 5 B) 5, 1, 3, 2, 4 C) 5, 2, 1, 3, 4 D) 4, 2, 1, 3, 5

4. 15.6 gr metall oksidlanganda 18.8 gr oksid hosil qilsa. Bu qaysi metall.

A) K B) Ca C) Zn D) Mg

5. 2.74 gr ishqoriy yer metall suvda eritilganda (n.sh) da 448 ml gaz ajralgan bo’lsa, reaksiya uchun qaysi metall olingan.

A) Ca B) Be C) Mg D) Ba

6. Al(NO₃)₃ ^. n H₂O modda tarkibida N-15.73% bo’lsa, “n” qiymatini toping.

A) 1 B) 2 C) 3 D) 4

7. Al(NO₃)₃ ^. nH₂O kristalgidrat tarkibida O ning massa ulushi O-72.98% teng bo’lsa “n” qiymatini toping.

A) 3 B) 4 C) 5 D) 6

8. 4 g vodorod hosil qilish uchun necha gr. kaliy gidrid suv bilan reaksiyaga kirishishi kerak?

A) 20 B) 80 C) 40 D) 160 E) 120