NTA Abhyas JEE Main2020Chemistryd and f Block ElementsPractice
The addition of NaOH to C r 3 + solution produces the precipitate of
Options
- AC r ( O H ) 3
- BC r O 3
- CC r 2 O 3 ( H 2 O ) n
- DC r 2 O 3
Correct answer
C. C r 2 O 3 ( H 2 O ) n
Step-by-step solution
C r ( O H ) 3 is not precipitated, but the hydrated oxide, C r 2 O 3 ( H 2 O ) n is precipitated. C r 3 + + 3 O H - → C r ( O H ) 3 → C r 2 O 3 ( H 2 O ) n