First slide

13th group or boron group

Question

In borax bead test the colour is due to formation of

Easy

A

Meta borate
B

Tetra borate
C

Pyro borate
D

Ortho borate

Solution

Na₂B₄O₇ .10H₂O $\to_{- 10 H_{2} O}^{∆}$ Na₂B₄O₇
Na₂B₄O₇ $\overset{∆}{\to}$ 2NaBO₂ + B₂O₃
CuO + B₂O₃ $\to$ Cu(BO₂)₂
Meta borates are colored

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