Chemistry - Salt Analysis Question with Solution | TestHub
ChemistrySalt AnalysisTEST OF CATIONS Dry Test, Group Analysis, Group 1,2Medium2 minQB
ChemistryMediumsingle choice
In borax bead test blue coloured bead of salt is produce due to the formation of :-
Options:
Answer:
A
Solution:
Borax, when heated, forms a transparent glassy bead containing sodium metaborate (NaBO₂) and boric anhydride (B₂O₃). When a Cu²⁺ salt is heated with this bead in an oxidizing flame, copper oxide dissolves in the bead, forming a blue-colored copper metaborate complex. The blue color is due to the formation of:
Na₂[Cu(BO₂)₄]
Hence, the correct answer is (A) Na₂[Cu(BO₂)₄].
Stream:JEESubject:ChemistryTopic:Salt AnalysisSubtopic:TEST OF CATIONS Dry Test, Group Analysis, Group 1,2
⏱ 2mℹ️ Source: QB
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