Assertion :Coloured cations can be identified by borax-bead test Reason: Transparent bead $(N a {B O}_{2} + B_{2} O_{3})$ forms coloured bead with coloured cation

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Here, both assertion and reason are correct and reason is the correct explanation for assertion.
We use borax bead test to detect coloured ions. When the salt under analysis is placed on the borax bead and heated the boric anhydride reacts the salts forming a metaborate of characteristic colour and we can identify the given radical.
$N a_{2} B_{4} O_{7} .10 H_{2} 0 + H e a t \to 2 N a B O_{2} + B_{2} O_{2} + 10 H_{2} 0$
Borax Transpent Bead

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