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In a flame test, which of the following observations is INCORRECT?

1. (A) Barium imparts an apple green colour to the flame
2. (B) Strontium imparts a crimson red colour to the flame
3. (C) Calcium imparts no colour to the flame
4. (D) Sodium imparts a golden yellow colour to the flame

Correct answer: (C) Calcium imparts no colour to the flame

Solution

In flame tests, metallic ions emit characteristic colours due to electronic transitions. Barium gives apple green, strontium gives crimson red, sodium gives golden yellow. Calcium gives a brick red (orange-red) colour, NOT no colour. Hence statement C is incorrect.

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