When borax is heated with CoO on a platinum loop, blue colo…

Chemistry S and P - Block Elements (S - Block Elements Not In Syllabus ) JEE Main 2022 - P Block Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 12, 2026

When borax is heated with CoO on a platinum loop, blue coloured bead formed is largely due to :

B 2 O 3

Co(BO 2 ) 2

CoB 4 O 7

Co[B 4 O 5 (OH) 4 ]

Text Solution

Verified by Experts

The correct answer is:

Na 2 B 4 O 7 10H 2 O Na 2 B 4 O 7 + 10H 2 O

Na 2 B 4 O 7 2NaBO 2 (sodium meta borate) + B 2 O 3

B 2 O3 + CoO Co(BO 2 ) 2 (cobalt (II) meta borate) Blue Bead

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