1 Kislorod atomining absolyut massasi 2,6057 10²³ grammga teng. Uning nisbiy atom massasini toping ?

8- sinf

1) Kislorod atomining absolyut massasi 2,6057 * 10²³ grammga teng. Uning nisbiy atom massasini toping ?

A) 32 B) 16 C) 64

2) H2SO4 ning molekulyar massasini hisoblang?

A) 98 B) 100 C) 133,5

3) Oltingugurt IV kislorod II valentli ekanligidan foydalanib oltingugurt (IV) – oksidining formulasini yozing ?

A) SO B) SO2 C) SO3

4) Quidagi CaH2, RbH, KH, SiH4 berilgan birikmalardagi metallarning valentligini aniqlang ? (ketma ketlikda)

A) 2,1,1,4 B) 1,2,1,4 C) 2,1,2,4

5) 49 gramm H3PO4 dagi modda miqdarini hisoblab toping?

A) 0,5 mol B) 0,6 mol C) 2 mol

6) Malaxitning malekulyar massasini hisoblang ?

A) 106 B) 158 C) 160

7) O’rta tuz keltirilgan qatorni aniqlang?

A) NaCl, NaHCO₃ B) CaCl₂, KHSO₄ C) Al(SO₄)₃, Fe(NO₃)₂

8) Amfoter gidroksidlarga misol keltiring?

A) Zn(OH)₂, Cu(OH)₃, Al(OH)₃

B) Zn(OH)₂, NaOH, Fe(OH)₂

C) Cr(OH)₃, Ca(OH)₂, Ba(OH)₂

9) Ishqoriy metalldan boshlanib inert gazlar bilan tugaydigan elementlarning gorizontal qatori . . . . . . deb ataladi?

A) guruhlar B) galogenlar C) davrlar

10) Metalmaslik xossasi eng kuchli bo’lgan element qaysi?

A) F B) O2 C) H2

11) 1748-yilda M.V.Lomonosov qanday qonunni kashf etadi?

A) tarkibning doimiylik qonuni

B) massaning saqlanish qonuni

C) organik birikmalarning tuzulish nazariyasi

12) Valentlik tushunchasini fanga kim olib kirgan?

A) Kekule B) Butlerov C) Franklend

13) 26 gramm rux metaliga . ... mol xlaorid kislota ta’sir ettirib necha gramm rux xlorid va qancha vodorod olish mumkin?

A) 0.9 gr H_2, 54,4 ZnCl₂ B) 0.8 gr H_2, 55,4 ZnCl₂ C) 0.7 gr H_2, 54,4 ZnCl₂

14) Natriy va Kaliyning protonlar soni nechta ?

A) Na-11, K-19 B) Na-19, K-11 C) Na-22, K-19

15) Alyuminiyning neytronlar soni nechta ?

A) 13 ta B) 20 ta C) 26ta