Q. Which reaction is NOT a redox reaction?
A) H$_2$ + Cl$_2$ → 2 HCl
B) BaCl$_2$ + Na$_2$SO$_4$ → BaSO$_4$ + 2 NaCl
C) Zn + CuSO$_4$ → ZnSO$_4$ + Cu
D) 2 KClO$_3$ + I$_2$ → 2 KIO$_3$ + Cl$_2$
Explanation
[Solution by Claude - not from source] The precipitation of $BaSO_4$ involves no change in oxidation numbers. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.