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  • In borax bead test, which of the following compound is formed?Option: 1 Meta borate  Option

In borax bead test, which of the following compound is formed?

Option: 1

Meta borate
 


Option: 2

Tetra borate
 


Option: 3

Double oxide
 


Option: 4

Ortho borate


Answers (1)

best_answer

When borax is heated, we obtain Sodium Metaborate and boric oxide. 

\begin{aligned} \mathrm{Na}_{2} \mathrm{~B}_{4} \mathrm{O}_{7} \cdot 10 \mathrm{H}_{2} \mathrm{O} \xrightarrow[-10\; \text{H}_{2}\text{O}]{} & \mathrm{Na}_{2} \mathrm{~B}_{4} \mathrm{O}_{7} & \stackrel{\Delta}{\longrightarrow} 2 \mathrm{NaBO}_{2}+\mathrm{B}_{2} \mathrm{O}_{3} \end{aligned}

Boric oxide reacts with metal oxides and forms the metal metaborate

\\\mathrm{CuO}+\mathrm{B}_{2} \mathrm{O}_{3} \rightarrow \mathrm{Cu}\left(\mathrm{BO}_{2}\right)_{2}\\                                                

                          \text{(Copper meta borate)}

Thus, metaborates of the metal are obtained in the Borax bead test.

Hence, the correct answer is Option (1)

Posted by

Ritika Jonwal

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