Kimyo 8-sinf I chorak 10% nitrat kislota hosil qilish uchun 30%50g nitrat kislotaga qancha suv qo’shish kerak?

11.Quyidagi moddalardan kuchsiz elektrolitlarni toping;1.aluminiy nitrat 2.silikat kislota 3.mis(II) karbonat 4.temir(II) nitrat 5.vodorod ftorid kislota 6. natriy sulfat

A) 1,4,6 B) 2,3,5 C) 3,4,6 D) 2,4,5

12. Ion almashinish reaksiyasini toping (ohirgacha boradigan reaksiyani toping)

A) Mg(NO₃)₂ + K₂SO₄→ B) NaCl + K₂SO₄→

C) HCl + HNO₃→ D) CuSO₄ + NaOH→

13. Ion bog’lanishga ega bo’lgan oksidlarni tanlang. 1) xlor(V)oksid; 2)oltingugurt (VI)oksid; 3)xrom(III)oksid 4)seziy oksid 5)fosfor (V)oksid 6) kalsiy oksid

A) 1,3,4 B) 2,3,5 C) 4,5,6 D) 3,4,6

14. Kaliy permanganarning grafik formulasida nechta sigma va pi bog’ bor?

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

15. Azot molekulasida atomlar o’zaro nechta juft elektron vositasida birikadi?

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

16. Vodorod, uglerod, azot,oltingugurt qanday birikmalarda manfiy oksidlanish darajada ega?

A) gidrid, karbonat, nitrat,sulfat B) gidrid,karbid,nitrid,sulfit

C) gidrid,karbid,nitrid,sulfide D) gidrat,karbonar,nitrid,sulfid

17. Reaksiyaning temperatura koeffisiyenti 3ga teng . Reaksiya tezligini 27marta oshirish uchun temperaturani necha marta oshirish kerak?

A) 10 B) 20 C) 30 D) 40