Question

Assertion Coloured cations can be identified by borax bead test.
Reason Transparent bead $\left( NaBO _{2}+ B _{2} O _{3}\right)$ forms coloured bead with coloured cation.

• A. If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
• B. If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion
• C. If Assertion is true but Reason is false
• D. If both Assertion and Reason are false

Answer 1

Answer: (A)

Borax, when heated at about $740^{\circ} C$, forms a glassy bead.

This glassy bead gives different colour beads with different cations. Hence, it is used to identify cations in qualitative analysis. This test is called borax bead test.