MCQ
While testing the sulphur in organic compounds the violet colour forms due to :
- AFormation of $Na _4\left[ Fe ( CN )_6\right]$
- BFormation of $Na _3\left[ Fe ( CN )_6\right]$
- ✓Formation of $Na _4\left[ Fe ( CN )_5 NOS \right]$
- DFormation of $K _3\left[ Fe ( CN )_5 NOS \right]$
