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  • When borax is heated with on a platinum loop, blue coloured bead formed is largely due to<div

When borax is heated with \mathrm{CoO} on a platinum loop, blue coloured bead formed is largely due to

Option: 1

\mathrm{B}_{2} \mathrm{O}_{3}


Option: 2

\mathrm{Co}\left(\mathrm{BO}_{2}\right)_{2}


Option: 3

\mathrm{CoB}_{4} \mathrm{O}_{7}


Option: 4

\mathrm{Co}\left[\mathrm{B}_{4} \mathrm{O}_{5}(\mathrm{OH})_{4}\right]


Answers (1)

best_answer

Borax bead test
\mathrm{Na}_{2} \mathrm{B}_{4} \mathrm{O}_{7} \overset{\Delta }{\rightarrow} 2\, \mathrm{NaBO}_{2}+\mathrm{B}_{2} \mathrm{O}_{3}
                                  Sodium
                                  metaborate

\mathrm{CoO+B_{2}O_{3}\overset{\Delta }{\rightarrow}Co\left ( BO_{2} \right )_{2}}
                                    Cobalt metoborate
                                      (blue)

Hence option (2) is correct.

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