Same chapter3 marksDifficulty: Medium
Describe the Solvay process for the manufacture of sodium carbonate in outline.
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3 marksDifficulty: Medium
Why do the alkali metals impart a characteristic colour to a flame?
Original Khojo Papers practice question — not from a past board paper.
Answer
The heat of the flame excites the loosely held outermost electron to a higher energy level, and when it falls back it emits the excess energy as light of a definite wavelength. Because the energy gap differs from metal to metal, each gives a different colour: sodium yellow, potassium lilac and lithium crimson.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
The effect is used in the flame test in qualitative analysis.
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