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NEET 2002
Exam
NEET
Year
2002
Subject
Chemistry
Chapter
Practical Chemistry

NEET 2002 · Chemistry · Practical Chemistry

In the borax bead test, which compound is formed?

In the borax bead test, which compound is formed?

Options

  1. AOrthoborate
  2. BMetaborate
  3. CDouble oxide
  4. DTetraborate

Correct answer

B. Metaborate

Step-by-step solution

In borax bead test the coloured Metaborates are formed by transition metal salts. Na2B4O7⟶Δ2NaBO2+B2O3 Salt of  Co⟶ΔCoO+ gas CoO+B2O3⟶ΔCo(BO2)2 cobalt metaborate  (blue colour) \begin{aligned} \mathrm{Na}_2 \mathrm{ B}_4 \mathrm{O}_7 \stackrel{\Delta}{\longrightarrow} & 2 \mathrm{NaBO}_2+\mathrm{B}_2 \mathrm{O}_3 \\ \text{ Salt\text{ of } } \mathrm{Co} \stackrel{\Delta}{\longrightarrow} & \mathrm{CoO}+\text{ gas } \\ \mathrm{CoO}+\mathrm{B}_2 \mathrm{O}_3 \stackrel{\Delta}{\longrightarrow} & \mathrm{Co}\left(\mathrm{BO}_2\right)_2 \\ &\begin{array}{c} \text{ cobalt metaborate } \\ \text{ (blue colour) } \end{array} \end{aligned}
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