(A) The flame test is used to identify metal ions based on the characteristic colour they impart to a flame. $Barium$ $(Ba^{2+})$ ions impart a charac

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(A) The flame test is used to identify metal ions based on the characteristic colour they impart to a flame. $Barium$ $(Ba^{2+})$ ions impart a characteristic apple-green colour to the flame. $Calcium$ $(Ca^{2+})$ imparts a brick-red colour,and $Strontium$ $(Sr^{2+})$ imparts a crimson-red colour.