JEE MAIN - Chemistry (2022 - 24th June Evening Shift - No. 14)
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?
Cu2+
Sr2+
Ba2+
Ca2+
Explanation
Cupric salts give green flame with blue centre. The colour of other salts are
$\begin{array}{ll}\mathrm{Sr}^{2+} & \text { Crimson red } \\ \mathrm{Ca}^{2+} & \text { Brick red } \\ \mathrm{Ba}^{2+} & \text { Green }\end{array}$
$\begin{array}{ll}\mathrm{Sr}^{2+} & \text { Crimson red } \\ \mathrm{Ca}^{2+} & \text { Brick red } \\ \mathrm{Ba}^{2+} & \text { Green }\end{array}$
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