See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

Balanced reaction is   5 2 4 2 4 2 2 3 7 2CrO 3H SO Cr SO 3H O O 2     So, 1 mole CrO5 liberates 7 4 moles of O2. It is a redox reaction because oxidation number of Cr decreases and oxidation number of O increases. Cr O O O O O 1  6  1  2  1  1 