JEE Main202430 Jan 2024Evening ShiftChemistryd and f Block ElementsActual
A and B formed in the following reactions are: CrO 2 Cl 2 + 4 NaOH → A + 2 NaCl + 2 H 2 O A + 2 HCl + 2 H 2 O 2 → B + 3 H 2 O
Options
- AA = Na 2 CrO 4 , B = CrO 5
- BA = Na 2 Cr 2 O 4 , B = CrO 4
- CA = Na 2 Cr 2 O 7 , B = CrO 3
- DA = Na 2 Cr 2 O 7 , B = CrO 5
Correct answer
A. A = Na 2 CrO 4 , B = CrO 5
Step-by-step solution
Chromyl chloride dissolves in NaOH solution to give a yellow solution. The chromate solution changes to blue colour chromium peroxide with hydrogen peroxide. The reaction will be as follows, CrO 2 Cl 2 + 4 NaOH → Na 2 CrO 4 + 2 NaCl + 2 H 2 O CrO 4 2 - + 2 H + + 2 H 2 O 2 → CrO 5 + 3 H 2 O Hence, option A is the answer.