Kimyo 8-sinf i-variant

Kimyo

8-sinf

I-variant
1. Reaksiya tenglamasining o’ng qismidagi koeffisiyentlar yigindisi nechaga teng?

KMnO₄+HClà MnCl₂ +KCl+H₂O + Cl₂

1. 
   4 B) 8 C) 17 D) 18
   

2. Element yuqori oksidining formulasi EO₃ . Uning vodorodli birikmasida 2,47% vodorod bor. Bu element:

A) S B) Se C) Te D) Po

3.1,25 mol Fe₂O₃ va 2,25 mol Al₂O₃ dagi atomlar sonining nisbatini toping.

A) 2:2,8 B) 1:1,8 C)1,8:1 D) 1:2,6

4. Kaliy sulfat eritmasida1200 ta ion mavjud . Dissotsiyalanmagan molekulalar sonini toping (a=0,8)

A) 120 B) 100 C) 80 D) 75

5. Quyidagi zarrachalardan qaysi birida elektronlarning neytronlarga nisbati birdan katta?

1) NO⁺ 2) NH₃ 3) H₃O⁺ 4) SO₄^2-

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