Q. Which of the following does not give oxygen on heating ?
A) KClO₃
B) Zn(ClO₃)₂
C) K₂Cr₂O₇
D) (NH₄)₂Cr₂O₇
Explanation
[Solution from source] (NH₄)₂Cr₂O₇ → N₂ + Cr₂O₃ + 4H₂O on heating, releasing nitrogen, not oxygen. KClO₃ and Zn(ClO₃)₂ release O₂, and K₂Cr₂O₇ on strong heating gives K₂CrO₄, Cr₂O₃ and O₂. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.