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. Quyidagi qaysi moddalar bilan uglerod (IV)-oksidi reaksiyaga kirishadi, reaksiya tengiamalarini yozing.
HNO₃ NaOH, KCI, SO₃ Na₂O, H₂SO₄, Ca(OH)₂, K₂O.
2. Kremniyning kimyoviy xossalarini namoyon qiluvchi reaksiya
iengiamalarini yozing.
3. 10 g kalsiy karbonati bor bo‘lgan suspenziyani gidrokorbonat holida eritish uchun qancha hajm uglerod (IV)-oksidi kerak bo'ladi?
4.Quyidagi oksidianish-qaytarilish reaksiya tenglamaiariga koeffitsiyentlar tanlang va oksidlovchi hamda qaytaruvchini aniqlang.
A) С + HNO₃ = CO₂ + NO₂ + H₂O;
B) SiCI₄ + NaOH = Na₄SiO₄ + NaCI + H₂O
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