JEE Main 2022 · 24 Jun · Shift 2 · Chemistry Q80

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ChemistrySingle correct+4 / -1Question 80 of 90

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?

\mathrm{Cu^{2+}}

\mathrm{Sr^{2+}}

\mathrm{Ba^{2+}}

\mathrm{Ca^{2+}}

Answer and worked solution

Official answer: A

Flame colours. $\mathrm{Cu^{2+}}$ gives a green flame with a blue centre. $\mathrm{Sr^{2+}}$ gives crimson, $\mathrm{Ba^{2+}}$ apple green, $\mathrm{Ca^{2+}}$ brick red.

(A)

Topics:Flame and borax bead tests

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JEE Main 2022 · 24 Jun · Shift 2, Chemistry question 80