C gacha sovitilganda qanday massadagi Ba no

Yopiq test

21. 1 2 3

A → B → C

CaCO₃ + CaSO₄

4 5 6
→D → E → F

Reaksiya 1-parchalanish; reaksiya 2,5 – birikish; qolganlari almashinish reaksiyalari. Sxemaga mos reaksiya tenglamalarini yozing.
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22. Nima uchun 2,4-dinitrofenol va pikrin kislota boshqa ko`pchilik fenollardan farqli ravishda suvli soda eritmasida erishini tushuntiring.

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23. D – galaktozaning oksidlanish – qaytarilish reaksiya tenglamasini yozing.

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24. Elementning 2 xil xloridi tarkibida massa ulushlari mos ravishda 32,39% va 26,43% ga teng bo`lsa, birikmalardagi elementning maksimum oksidlanish darajasini toping.
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25. Quyidagi oksidlanish-qaytarilish reaksiyasini tugallang:

1) CuSO₄ + KI → …
2) CuCl + HNO₃ → …