Q. Which reaction is not valid?
A) HCl + F_{2} ⟶ HF + Cl_{2}
B) HF + Cl_{2} ⟶F_{2} + HCl
C) Zn + HCl ⟶ZnCl_{2} + H_{2}
D) Al + HCl ⟶AlCl_{3} + H_{2}
Explanation
(b)
A more electronegative halogen displaces less electronegative halogen from its halide. Fluorine is more electronegative than chlorine hence, it can displace Cl from HCl while chlorine cannot displace fluorine from HF. Therefore, the following reaction is not valid.
HF + Cl_{2} ⟶F_{2} + HCl
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.