Surxondaryo viloyati boysun tumani 7-umumta’lim maktabining – “A


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7-sinf Kimyo fanidan nazorat ishi daftari 2022-2023

Nazorat shakli: Yozma ish.

1.Quyidagi formulalarni valentlik asosida tuzing :


II CuO III CrO VII ClO AlO I HgO KO III NH
IVCO II H S VI SO
2. Xlorning valentligi besh ekanligini bilgan holda uning kislorod bilan hosil qilgan birikmasining formulasini yozing.
3. Quyidagi moddalarning proton,neytron va elektronlarini aniqlang:
a) NH­3 b) O2 c) Si D) CO­2
4. 88Sr izotopi atomining yadrosini necha foizi neytronlardan iborat.
5. Xlorningvalentligibir, kislorodningvalentligiikkiekanliginibilganholdaformulalari FeCl2, AlCl3, LiCl, K2O, MgO, Cr2O3, CrO3, CrO, Mn2O7, MnO2bo‘lganbirikmalardagiikkinchielementlarningvalentliginianiqlang.
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