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Which metal chloride, when introduced directly into a flame, produces an apple-green coloured flame?

1. Barium chloride
2. Strontium chloride
3. Calcium chloride
4. Sodium chloride

Correct answer: Barium chloride

Solution

Barium chloride produces a distinctive apple-green (or yellowish-green) flame when heated, caused by emission from electronically excited barium species. Strontium gives crimson, calcium gives brick-red, and sodium gives golden-yellow flames.

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