A salt imparts an apple-green colour to a non-luminous Bunsen flame. The cation present is

A $Ba X^{2 +}$
B $Sr X^{2 +}$
C $Ca X^{2 +}$
D $Mg X^{2 +}$

Answer: A

Barium salts give an apple-green flame. Strontium gives crimson red, calcium gives brick red, and magnesium gives no characteristic flame colour. The cation is therefore

Ba X^{2 +}

Practice Qualitative Analysis: Cations More on Group V and VI cations (Ba, Sr, Ca, Mg) and NH4+

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