See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

  Δ 4 2 7 2 2 2 3 2 NH Cr O N 4H O Cr O    Δ 3 2 3 2 3 2CrO Cr O O 2   Δ 2 2 7 2 4 2 3 2 3 2K Cr O 2K CrO Cr O O 2    2 3 Al O Cr No reaction  