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Green edged flame test for BO(3)^(3-) wi...

Green edged flame test for `BO_(3)^(3-)` with alcohol and conc. `H_(2)SO_(4)` is generally carried out in a china dish. However, the test should be carried out in a test tube if one of the cation present in solution is

A

`Ba^(2+)`

B

`Cu^(2+)`

C

`Ca^(2+)`

D

`Zn^(2+)`

Text Solution

Verified by Experts

Green edged flame test for `BO_(3)^(3-)` should be carried out in a test tube when `Cu^(2+)` ions are also present in the mixture. This is because `Cu^(2+)` ions also give a green flame in flame test. When the test is carried out in a test tube the green edged flame is only due to the volatile `(C_(2)H_(5))_(3)BO_(3)` as `Cu^(2+)` ions are not volatile in solution.
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Knowledge Check

  • A salt having BO_(3)^(3-) on burning with alcohol and conc. H_(2)SO_(4) gives, which colour edge flame.

    A
    green
    B
    yellow
    C
    red
    D
    white

  • A salt having BO_(3)^(3-) on burning with cone H_(2)SO_(4) gives …. Edge flame

    A
    Green
    B
    yellow
    C
    Red
    D
    White

  • Borate form green edged flame when burnt with conc. H_(2)SO_(4)+ ethanol. Green edged flame has formula -

    A
    `(C_(2)H_(5)O)_(3) B`
    B
    `(C_(2)H_(5))_(2)BO_(2)`
    C
    `(C_(2)H_(5))_(3)BO_(3)`
    D
    1 and 3

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