Odobnoma fanidan 4-sinflar uchun test savollari I variant

7.69 gr Na ning suvda erishidan necha l(n.sh)da gaz ajralib chiqadi?

A.33.6 B.22.4 S.11.2 D44.8

8.Mn atomining elektron, proton, neytronlar sonini aniqlang.

A.25, 25, 25 B.25, 30, 25 S. 25, 25, 30 D.30, 25, 25

9.K₂Cr₂O₇ molekulasida nechta σ va π bog’ mavjud?

A.10:4 B.8:7 S.9:5 D.7:12

10. 72 g suv elektr toki ta’sirida parchalanganda qancha miqdor vodorod xosil bo’ladi?

A.2 B.3 S.4 D.5

11.Kaustik sodaning formulasini yozing.

12.Eng plastik metall nomini yozin.

13.O’zbekiston oltin zaxiralari bo’yicha dunyoda nechanchi o’rida turadi?

14.Yoritish lampochkasida necha xil metall bor?

15.Quyidagi reaksiyani tugallang va koeffisientlar yig’indisini toping.Ca(HCO)₃+HCl→CaCl₂+CO₂+H₂O