When borax is heated with CoO on a platinum loop, blue coloured bead formed is largely due to
← JEE Main 2022 · 29 Jul · Shift 2
ChemistrySingle correct+4 / -1Question 69 of 90
JEE Main 2022 · 29 Jul · Shift 2, Chemistry question 69
Answer and worked solution
Official answer: B
Bead test. Borax gives NaBO₂ + B₂O₃; the B₂O₃ reacts with CoO to form blue cobalt metaborate, Co(BO₂)₂.
(B)
Topics:Flame and borax bead tests