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In the flame test of a mixture of salts, a green flame with blue centre was observed. Which one of the following cations may be present?

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In the flame test of a mixture of salts, a green flame with blue centre was observed. Which one of the following cations may be present? 

(A) Cu2+ 

(B) Sr2+ 

(C) Ba2+ 

(D) Ca2+

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Correct option is (A) Cu2+

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