JAMB - Chemistry (2001 - No. 42)
Which of the following metals burn with brick red flame?
Pb
Ca
Na
Mg
Vysvětlení
When heated, lead (Pb) burns with a bluish-white or greyish-white flame.
When heated, calcium burns with a brick red flame and forms a white solid. The calcium ion (Ca2+) produces a brick red color in a flame test.
When heated in air, sodium (Na) burns with a bright, golden yellow flame.
When heated, magnesium burns with a bright, dazzling white flame.