Which of the following pairs of cation and flame colour are correct?

A $Ca X^{2 +}$ : brick red
B $Ba X^{2 +}$ : apple green
C $K X^{+}$ : golden yellow
D $Cu X^{2 +}$ (as chloride) : lilac

Answer: A, B

Calcium gives a brick-red flame and barium an apple-green flame. Potassium gives a lilac flame, golden yellow is the colour of sodium. Copper(II) chloride gives a blue-green flame, not lilac. Options 1 and 2 are correct.

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