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Q.

Borax on heating with cobalt oxide forms a blue bead of

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a

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

b

${Na}_{3} Co {({BO}_{3})}_{2}$

c

${Co}_{3} {({BO}_{3})}_{2}$

d

${CoBO}_{2}$

answer is A.

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Detailed Solution

${Na}_{2} B_{4} O_{7} ⟶ 2 {NaBO}_{2} + B_{2} O_{3}$

$\underset{(Blue bead)}{B_{2} O_{3}} + Co ⟶ Co \cdot O \cdot B_{2} O_{3} or Co {({BO}_{2})}_{2}$

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