Select all correct statements about the flame tests.

ACalcium salts impart a brick-red colour to the flame.
BStrontium salts impart a golden-yellow colour to the flame.
CBlue cobalt glass is used to view the potassium flame because it absorbs the intense yellow emission of sodium impurity.
DBarium salts impart an apple-green colour to the flame.

Answer: A, C, D

Cobalt glass filters out the sodium yellow so the lilac of potassium shows; calcium is brick-red and barium apple-green. Strontium is crimson, not golden-yellow, so the fourth statement is wrong. The correct set is the first three.

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