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AMU Medical AMU Solved Paper-2004

  • question_answer
    Which of the following radicals, gives the apple green flame during flame test?

    A)  \[B{{a}^{2+}}\]                                

    B)  \[S{{r}^{2+}}\]

    C)  \[C{{a}^{2+}}\]                                

    D)  \[N{{a}^{+}}\]

    Correct Answer: A

    Solution :

                     Flame colouration All the alkali and some alkaline metals impart a characteristic colour to the flame. When paste of salt in cone. HCl is burnt on a spetchula the following coloured flame appears for different radicals.
    Cation Colour
    \[N{{a}^{+}}\] golden yellow
    \[{{K}^{+}}\] violet
    \[C{{a}^{2+}}\] brick red
    \[S{{r}^{2+}}\] crimson red
    \[B{{a}^{2+}}\] apple green
    Therefore \[B{{a}^{2+}}\] radical gives the apple green flame during flame test.


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