Question
The green colour produced in the borax bead test of a chromium(III) salt is due to -
JEE Advanced
Chemistry
Practical Chemistry
2019
JEE Advanced 2019 (Paper 1)
JEE Advanced Chemistry Question (2019) — Solution
Options
- A. C r B O 2 3
- B. C r B
- C. C r 2 B 4 O 7 3
- D. C r 2 O 3
Answer
A. C r B O 2 3
Step-by-step solution
Borax bead test Na 2 B 4 O 7 .10H 2 O  → Δ Na 2 B 4 O 7   → Δ NaBO 2   + B 2 O 3 C r 2 O 3 + B 2 O 3   → Δ G r e e n   c o l o u r e d        C r ( B O 2 ) 3
Related: Chemistry — Practical Chemistry · All PYQ Banks