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 _________

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3-Nazorat ishi

Mavzu: Metallaming davriy sistemadagi o'rni, tabiatda tarqalishi, ishlatilish sohalari, xossalari, elektrokimyoviy kuchlanish qatori, qotishmalar, ularning xossa­lari.

Nazorat shakli: Masalalar yechish.

I variant

1. Osh tuzi eritmasidan elektr toki o‘tkazilganda anodda n. sh.da o'lchanganda 11,2 l kislorod ajralgan bo‘lsa, katodda necha gramm natriy gidroksid hosil bo'ladi?

2. 1,2 mol kaliy suv bilan reaksiyaga kirishganda n.sh.da o'lchanganda qancha hajm vodorod ajralib chiqadi?

3. Natriy sulfat tuziga natriy karbonat aralashganligini qanday tajriba bilan anlqlash mumkin? Reaksiya tenglamalarini yozing.

4. Quyidagi o'zgarishlarni amalga oshirish uchun zarur reaksiya tenglamaiarini yozing:

NaCI →Na → NaOH → NaCI → NaNO₃ → O₂ Masalalarni yechilishi_______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________