Element atomlarining boshqa elementlarning muayyan sondagi atomlarini biriktirib olish xususiyati

++++++++++++++++++++++++++++++++

Qaysi birikmalarda uglerod atomlarining oksidlanish darajalari yig‘indisi -2 dan

katta? 1) C₂H₄ 2) CH₃COOH 3) С₂Н₅OH 4) C₆H₁₂O₆
===========================
1, 3
=============================
# 2, 4
==========================
1, 4
==============================
2, 3
+++++++++++++++++++++++++++++++++
Quyidagi reaksiya tenglamasidan oksidlovchi va qaytaruvchini ko‘rsating.
Fe + HCl -→FeCl2 +H2
======================================
Fe - oksidlovchi, Cl – qaytaruvchi
====================================
Fe - oksidlovchi, H – qaytaruvchi
======================================
# H - oksidlovchi, Fe – qaytaruvchi
==========================================
Cl - oksidlovchi, Fe – qaytaruvchi
+++++++++++++++++++++++++++++++++++
28. Ammoniy nitrit tarkibidagi azot atomlarining oksidlanish darajasi yig‘indisi-ni aniqlang.
================================
-1
==========================
# 0
============================
+2
================================
+1
++++++++++++++++++++++++++++++++
Qaysi zarrachalar juftligida xlorning oksidlanish darajasi manfiy qiymatga ega?
====================================
A) ClO_3- va HCl
====================================
B) CIBr₃ va CIF₄
=======================================
C) Cl2O7 va CCl4
======================================
#D) PCl₅ va SCl₂
++++++++++++++++++++++++++++++++++++++++
30. Qaysi tuzlarning suvli eritmasi fenolftaleinni to‘q qizil rangga bo‘yaydi?
1) natriy karbonat; 2) alyuminiy nitrat; 3) kaliy ftorid; 4) rux sulfat.
=========================================
# 1, 3