First slide

Borax

Question

Formula and colour of cobalt metaborate is

Easy

A

$Co {({BO}_{2})}_{3}$ , Yellow
B

$Co {({BO}_{2})}_{2}$ , Red
C

$Co {({BO}_{2})}_{3}$ , Green
D

$Co {({BO}_{2})}_{2}$ , Blue

Solution

${Na}_{2} B_{4} O_{7} . 10 H_{2} O \overset{∆}{\to} {Na}_{2} B_{4} O_{7} \overset{fuse}{\to} \underset{colour less glassy bead}{{NaBO}_{2} + B_{2} O_{3}}$
$CoO + B_{2} O_{3} \overset{}{\to} \underset{Blue}{Co {({BO}_{2})}_{2}} .$

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