Topic content:
The correct statement about the reaction KClO3+6HCl (concentrated) (2KCl+3Cl2 ↑+3H2O) is ()
A. Reduction of HCl
B. Transfer 5 moles of electrons when 3molCl2 is generated
C. +5 valent chlorine to - 1 valent chlorine
D. The ratio of oxidant and reducing agent is 1:6
Best answer:
A. In reaction KClO3+6HCl (concentrated) (KCl+3Cl2 ↑+3H2O), the valence of Cl element in HCl is - 1 → 0, so hydrogen chloride is oxidized, so A is wrong;
B. When 3molCl2 is generated, the amount of substance transferring electrons=16 × 3mol × 2 × (5-0)=5mol, so B is correct;
C. In reaction KClO3+6HCl (concentrated) (KCl+3Cl2 ↑+3H2O), the valence of Cl element in KClO3 is from+5 to 0, so C is wrong;
D. In this reaction, 56% concentrated hydrochloric acid is oxidized, so the ratio of oxidant to reducing agent is 1:5, so D is wrong;
Therefore, B
Answer analysis:
sixteen
Test core:
Essence of redox reaction: electron transfer (gain or loss or deviation) Characteristics of redox reaction: valence rise and fall (valence of some elements changes before and after reaction, which is the basis for judging redox reaction)