Kimyo 9-sinf

II variant

1. 
   53 gramm natriy karbonat yetarli miqdordagi ohakli suv bilan reaksiyaga kirishib qancha o‘yuvchi natriy hosil qiladi?
   
2. 
   Kaliyning kislorodli birikmalaridan birining tarkibida 44,8 % kislorod bor. Ushbu birikmaning oddiy formulasini aniqlang. Bunday birikmalar haqida nimalar bilasiz?
   
3. 
   KNO₃, NaNO₃, Pb(NO₃), kons. HNO₃, NH4NO₃,Cu(NO₃) va AgNO₃ qizdirilganda har qaysi moddada qanday o‘zgarish sodir bo‘ladi, reaksiya tenglamalarini yozing.
   
4. 
   Quyidagi o‘zgarishlarni amalga oshirish uchun zarur reaksiya tenglamalarini yozing. К→KOH→K₂SO₄→KCI→KNO₃→KNO₂
   

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