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As iron is heated in a flame, what colour sequence does it show?
ABlack, then violet, then blue
BWhite, yellow, then dull red
CBlue, then green, then red
DDull red, reddish yellow, white hot
Answer & Solution
Correct answer: D. Dull red, reddish yellow, white hot
As temperature rises, peak wavelength shifts to shorter values, giving red then yellow then white.
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