Chemistry - Salt Analysis Question with Solution | TestHub
ChemistrySalt AnalysisTEST OF CATIONS Dry Test, Group Analysis, Group 1,2Medium2 minQB
ChemistryMediumsingle choice
Which of the following ions produces colourless salt bead both in cold and hot conditions when heated in reducing (luminous) flame in Borax Bead Test :-
Options:
Answer:
C
Solution:
In the borax bead test, different metal ions give characteristic colored beads depending on their oxidation state in both an oxidizing and reducing (luminous) flame.
Mn²⁺ (manganese) forms manganate in oxidizing conditions, giving color. However, in a reducing (luminous) flame, it gets reduced to Mn²⁺/MnO, which results in a colorless bead.
On cooling, it also remains colorless in both hot and cold conditions in a reducing flame.
Other ions like Cu²⁺, Fe³⁺, Ni²⁺, etc., give colored beads.
So, only Mn²⁺ produces a colorless bead in a reducing flame (both hot and cold).
Correct answer: (C) Mn²⁺
Stream:JEESubject:ChemistryTopic:Salt AnalysisSubtopic:TEST OF CATIONS Dry Test, Group Analysis, Group 1,2
⏱ 2mℹ️ Source: QB
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