Mustaqillik yillarida mamlakatimizda hukumatimiz tomonidan ta’lim sohasiga eng muhim vazifa sifatida e’tibor qaratib kelinayotgani sir emas. Bu sohada qator islohotlar qabul qilindi

Nazorat ishining bali _________


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 55,2% kislorod bor. Ushbu birikmaning oddiy formulasini aniqlang. Bunday birikmalar haqida nimalar bilasiz?
3. Kaliy nitrat, natriy nitrat, qo‘rg‘oshin (II)-nitrat, konsentrlangan nitrat kislota, ammoniy nitrat, mis(II)-nitrat va kumush nitratlar 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 →КОН→ K₂SO₄ → KCI → KNO₃ → KNO₂
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